Use override rather than virtual.

src/ackermannization/ackermannize_bv_tactic.cpp

@@ -27,13 +27,13 @@ public:
         : m(m), m_p(p)
     {}
 
-    virtual ~ackermannize_bv_tactic() { }
+    ~ackermannize_bv_tactic() override { }
 
-    virtual void operator()(goal_ref const & g,
+    void operator()(goal_ref const & g,
         goal_ref_buffer & result,
         model_converter_ref & mc,
         proof_converter_ref & pc,
-        expr_dependency_ref & core) {
+        expr_dependency_ref & core) override {
         mc = 0;
         tactic_report report("ackermannize", *g);
         fail_if_unsat_core_generation("ackermannize", g);
@@ -69,24 +69,24 @@ public:
     }
 
 
-    void updt_params(params_ref const & _p) {
+    void updt_params(params_ref const & _p) override {
         ackermannize_bv_tactic_params p(_p);
         m_lemma_limit = p.div0_ackermann_limit();
     }
 
-    virtual void collect_param_descrs(param_descrs & r) {
+    void collect_param_descrs(param_descrs & r) override {
         ackermannize_bv_tactic_params::collect_param_descrs(r);
     }
 
-    virtual void collect_statistics(statistics & st) const {
+    void collect_statistics(statistics & st) const override {
         st.update("ackr-constraints", m_st.m_ackrs_sz);
     }
 
-    virtual void reset_statistics() { m_st.reset(); }
+    void reset_statistics() override { m_st.reset(); }
 
-    virtual void cleanup() { }
+    void cleanup() override { }
 
-    virtual tactic* translate(ast_manager& m) {
+    tactic* translate(ast_manager& m) override {
         return alloc(ackermannize_bv_tactic, m, m_p);
     }
 private:

src/ackermannization/ackr_bound_probe.cpp

@@ -57,7 +57,7 @@ class ackr_bound_probe : public probe {
 public:
     ackr_bound_probe() {}
 
-    virtual result operator()(goal const & g) {
+    result operator()(goal const & g) override {
         proc p(g.m());
         unsigned sz = g.size();
         expr_fast_mark1 visited;

src/ackermannization/ackr_model_converter.cpp

@@ -37,9 +37,9 @@ public:
         , fixed_model(false)
     { }
 
-    virtual ~ackr_model_converter() { }
+    ~ackr_model_converter() override { }
 
-    virtual void operator()(model_ref & md, unsigned goal_idx) {
+    void operator()(model_ref & md, unsigned goal_idx) override {
         SASSERT(goal_idx == 0);
         SASSERT(!fixed_model || md.get() == 0 || (!md->get_num_constants() && !md->get_num_functions()));
         model_ref& old_model = fixed_model ? abstr_model : md;
@@ -49,9 +49,9 @@ public:
         md = new_model;
     }
 
-    virtual void operator()(model_ref & md) { operator()(md, 0); }
+    void operator()(model_ref & md) override { operator()(md, 0); }
 
-    virtual model_converter * translate(ast_translation & translator) {
+    model_converter * translate(ast_translation & translator) override {
         ackr_info_ref retv_info = info->translate(translator);
         if (fixed_model) {
             model_ref retv_mod_ref = abstr_model->translate(translator);

src/ackermannization/lackr_model_converter_lazy.cpp

@@ -28,9 +28,9 @@ public:
         , model_constructor(lmc)
     { }
 
-    virtual ~lackr_model_converter_lazy() { }
+    ~lackr_model_converter_lazy() override { }
 
-    virtual void operator()(model_ref & md, unsigned goal_idx) {
+    void operator()(model_ref & md, unsigned goal_idx) override {
         SASSERT(goal_idx == 0);
         SASSERT(md.get() == 0 || (!md->get_num_constants() && !md->get_num_functions()));
         SASSERT(model_constructor.get());
@@ -39,13 +39,13 @@ public:
         model_constructor->make_model(md);
     }
 
-    virtual void operator()(model_ref & md) {
+    void operator()(model_ref & md) override {
         operator()(md, 0);
     }
 
     //void display(std::ostream & out);
 
-    virtual model_converter * translate(ast_translation & translator) {
+    model_converter * translate(ast_translation & translator) override {
         NOT_IMPLEMENTED_YET();
     }
 protected:

src/api/api_algebraic.cpp

@@ -345,9 +345,9 @@ extern "C" {
     public:
         vector_var2anum(scoped_anum_vector & as):m_as(as) {}
         virtual ~vector_var2anum() {}
-        virtual algebraic_numbers::manager & m() const { return m_as.m(); }
+        algebraic_numbers::manager & m() const override { return m_as.m(); }
-        virtual bool contains(polynomial::var x) const { return static_cast<unsigned>(x) < m_as.size(); }
+        bool contains(polynomial::var x) const override { return static_cast<unsigned>(x) < m_as.size(); }
-        virtual algebraic_numbers::anum const & operator()(polynomial::var x) const { return m_as.get(x); }
+        algebraic_numbers::anum const & operator()(polynomial::var x) const override { return m_as.get(x); }
     };
 
     Z3_ast_vector Z3_API Z3_algebraic_roots(Z3_context c, Z3_ast p, unsigned n, Z3_ast a[]) {

src/api/api_ast_map.h

@@ -25,7 +25,7 @@ struct Z3_ast_map_ref : public api::object {
     ast_manager &            m;
     obj_map<ast, ast*> m_map;
     Z3_ast_map_ref(api::context& c, ast_manager & _m): api::object(c), m(_m) {}
-    virtual ~Z3_ast_map_ref();
+    ~Z3_ast_map_ref() override;
 };
 
 inline Z3_ast_map_ref * to_ast_map(Z3_ast_map v) { return reinterpret_cast<Z3_ast_map_ref *>(v); }

src/api/api_ast_vector.h

@@ -27,7 +27,7 @@ namespace api {
 struct Z3_ast_vector_ref : public api::object {
     ast_ref_vector  m_ast_vector;
     Z3_ast_vector_ref(api::context& c, ast_manager & m): api::object(c), m_ast_vector(m) {}
-    virtual ~Z3_ast_vector_ref() {}
+    ~Z3_ast_vector_ref() override {}
 };
 
 inline Z3_ast_vector_ref * to_ast_vector(Z3_ast_vector v) { return reinterpret_cast<Z3_ast_vector_ref *>(v); }

src/api/api_datalog.cpp

@@ -51,8 +51,8 @@ namespace api {
             m_context(m, m_register_engine, p),
             m_trail(m) {}
 
-        virtual ~fixedpoint_context() {}
+        ~fixedpoint_context() override {}
-        family_id get_family_id() const { return const_cast<datalog::context&>(m_context).get_decl_util().get_family_id(); }
+        family_id get_family_id() const override { return const_cast<datalog::context&>(m_context).get_decl_util().get_family_id(); }
         void set_state(void* state) {
             SASSERT(!m_state);
             m_state = state;
@@ -73,7 +73,7 @@ namespace api {
         void set_reduce_assign(reduce_assign_callback_fptr f) { 
             m_reduce_assign = f; 
         }
-        virtual void reduce(func_decl* f, unsigned num_args, expr * const* args, expr_ref& result) {
+        void reduce(func_decl* f, unsigned num_args, expr * const* args, expr_ref& result) override {
             expr* r = 0;
             if (m_reduce_app) {
                 m_reduce_app(m_state, f, num_args, args, &r);
@@ -90,7 +90,7 @@ namespace api {
                 result = m.mk_app(f, num_args, args);
             }
         }
-        virtual void reduce_assign(func_decl* f, unsigned num_args, expr * const* args, unsigned num_out, expr* const* outs) {
+        void reduce_assign(func_decl* f, unsigned num_args, expr * const* args, unsigned num_out, expr* const* outs) override {
             if (m_reduce_assign) {
                 m_trail.push_back(f);
                 for (unsigned i = 0; i < num_args; ++i) {

src/api/api_datalog.h

@@ -38,7 +38,7 @@ struct Z3_fixedpoint_ref : public api::object {
     api::fixedpoint_context *   m_datalog;
     params_ref               m_params;
     Z3_fixedpoint_ref(api::context& c): api::object(c), m_datalog(0) {}
-    virtual ~Z3_fixedpoint_ref() { dealloc(m_datalog); }
+    ~Z3_fixedpoint_ref() override { dealloc(m_datalog); }
 };
 
 inline Z3_fixedpoint_ref * to_fixedpoint(Z3_fixedpoint s) { return reinterpret_cast<Z3_fixedpoint_ref *>(s); }

src/api/api_goal.h

@@ -24,7 +24,7 @@ Revision History:
 struct Z3_goal_ref : public api::object {
     goal_ref m_goal;
     Z3_goal_ref(api::context& c) : api::object(c) {}
-    virtual ~Z3_goal_ref() {}
+    ~Z3_goal_ref() override {}
 };
 
 inline Z3_goal_ref * to_goal(Z3_goal g) { return reinterpret_cast<Z3_goal_ref *>(g); }

src/api/api_model.h

@@ -24,7 +24,7 @@ Revision History:
 struct Z3_model_ref : public api::object {
     model_ref  m_model;
     Z3_model_ref(api::context& c): api::object(c) {}
-    virtual ~Z3_model_ref() {}
+    ~Z3_model_ref() override {}
 };
 
 inline Z3_model_ref * to_model(Z3_model s) { return reinterpret_cast<Z3_model_ref *>(s); }
@@ -35,7 +35,7 @@ struct Z3_func_interp_ref : public api::object {
     model_ref     m_model; // must have it to prevent reference to m_func_interp to be killed.
     func_interp * m_func_interp;
     Z3_func_interp_ref(api::context& c, model * m): api::object(c), m_model(m), m_func_interp(0) {}
-    virtual ~Z3_func_interp_ref() {}
+    ~Z3_func_interp_ref() override {}
 };
 
 inline Z3_func_interp_ref * to_func_interp(Z3_func_interp s) { return reinterpret_cast<Z3_func_interp_ref *>(s); }
@@ -47,7 +47,7 @@ struct Z3_func_entry_ref : public api::object {
     func_interp *       m_func_interp;
     func_entry const *  m_func_entry;
     Z3_func_entry_ref(api::context& c, model * m):api::object(c), m_model(m), m_func_interp(0), m_func_entry(0) {}
-    virtual ~Z3_func_entry_ref() {}
+    ~Z3_func_entry_ref() override {}
 };
 
 inline Z3_func_entry_ref * to_func_entry(Z3_func_entry s) { return reinterpret_cast<Z3_func_entry_ref *>(s); }

src/api/api_opt.cpp

@@ -36,7 +36,7 @@ extern "C" {
     struct Z3_optimize_ref : public api::object {
         opt::context* m_opt;
         Z3_optimize_ref(api::context& c): api::object(c), m_opt(0) {}
-        virtual ~Z3_optimize_ref() { dealloc(m_opt); }
+        ~Z3_optimize_ref() override { dealloc(m_opt); }
     };
     inline Z3_optimize_ref * to_optimize(Z3_optimize o) { return reinterpret_cast<Z3_optimize_ref *>(o); }
     inline Z3_optimize of_optimize(Z3_optimize_ref * o) { return reinterpret_cast<Z3_optimize>(o); }

src/api/api_solver.h

@@ -27,7 +27,7 @@ struct Z3_solver_ref : public api::object {
     params_ref                 m_params;
     symbol                     m_logic;
     Z3_solver_ref(api::context& c, solver_factory * f): api::object(c), m_solver_factory(f), m_solver(0), m_logic(symbol::null) {}
-    virtual ~Z3_solver_ref() {}
+    ~Z3_solver_ref() override {}
 };
 
 inline Z3_solver_ref * to_solver(Z3_solver s) { return reinterpret_cast<Z3_solver_ref *>(s); }

src/api/api_stats.h

@@ -24,7 +24,7 @@ Revision History:
 struct Z3_stats_ref : public api::object {
     statistics m_stats;
     Z3_stats_ref(api::context& c): api::object(c) {}
-    virtual ~Z3_stats_ref() {}
+    ~Z3_stats_ref() override {}
 };
 
 inline Z3_stats_ref * to_stats(Z3_stats s) { return reinterpret_cast<Z3_stats_ref *>(s); }

src/api/api_tactic.h

@@ -29,13 +29,13 @@ namespace api {
 struct Z3_tactic_ref : public api::object {
     tactic_ref   m_tactic;
     Z3_tactic_ref(api::context& c): api::object(c) {}
-    virtual ~Z3_tactic_ref() {}
+    ~Z3_tactic_ref() override {}
 };
 
 struct Z3_probe_ref : public api::object {
     probe_ref    m_probe;
     Z3_probe_ref(api::context& c):api::object(c) {}
-    virtual ~Z3_probe_ref() {}
+    ~Z3_probe_ref() override {}
 };
 
 inline Z3_tactic_ref * to_tactic(Z3_tactic g) { return reinterpret_cast<Z3_tactic_ref *>(g); }
@@ -52,7 +52,7 @@ struct Z3_apply_result_ref : public api::object {
     proof_converter_ref  m_pc;
     expr_dependency_ref  m_core;
     Z3_apply_result_ref(api::context& c, ast_manager & m);
-    virtual ~Z3_apply_result_ref() {}
+    ~Z3_apply_result_ref() override {}
 };
 
 inline Z3_apply_result_ref * to_apply_result(Z3_apply_result g) { return reinterpret_cast<Z3_apply_result_ref *>(g); }

src/api/api_util.h

@@ -88,7 +88,7 @@ inline lbool    to_lbool(Z3_lbool b) { return static_cast<lbool>(b); }
 struct Z3_params_ref : public api::object {
     params_ref m_params;
     Z3_params_ref(api::context& c): api::object(c) {}
-    virtual ~Z3_params_ref() {}
+    ~Z3_params_ref() override {}
 };
 
 inline Z3_params_ref * to_params(Z3_params p) { return reinterpret_cast<Z3_params_ref *>(p); }
@@ -98,7 +98,7 @@ inline params_ref to_param_ref(Z3_params p) { return p == 0 ? params_ref() : to_
 struct Z3_param_descrs_ref : public api::object {
     param_descrs m_descrs;
     Z3_param_descrs_ref(api::context& c): api::object(c) {}
-    virtual ~Z3_param_descrs_ref() {}
+    ~Z3_param_descrs_ref() override {}
 };
 
 inline Z3_param_descrs_ref * to_param_descrs(Z3_param_descrs p) { return reinterpret_cast<Z3_param_descrs_ref *>(p); }

src/ast/ast_trail.h

@@ -66,7 +66,7 @@ public:
         m.insert(s,t);
     }
 
-    virtual void undo(Ctx& ctx) {
+    void undo(Ctx& ctx) override {
         m_map.pop();
     }    
 };

src/interp/iz3proof_itp.cpp

@@ -211,7 +211,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
         pivot literal, while the conclusion of premise2 should contain the
         pivot literal.
     */
-    node make_resolution(ast pivot, const std::vector<ast> &conc, node premise1, node premise2) {
+    node make_resolution(ast pivot, const std::vector<ast> &conc, node premise1, node premise2) override {
         LitType lt = get_term_type(pivot);
         if(lt == LitA)
             return my_or(premise1,premise2);
@@ -2146,7 +2146,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     }
   
     /** Make an assumption node. The given clause is assumed in the given frame. */
-    virtual node make_assumption(int frame, const std::vector<ast> &assumption){
+    node make_assumption(int frame, const std::vector<ast> &assumption) override {
         if(!weak){
             if(pv->in_range(frame,rng)){
                 std::vector<ast> itp_clause;
@@ -2219,7 +2219,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     /** Make a modus-ponens node. This takes derivations of |- x
         and |- x = y and produces |- y */
   
-    virtual node make_mp(const ast &p_eq_q, const ast &prem1, const ast &prem2){
+    node make_mp(const ast &p_eq_q, const ast &prem1, const ast &prem2) override {
     
         /* Interpolate the axiom p, p=q -> q */
         ast p = arg(p_eq_q,0);
@@ -2281,7 +2281,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     }
 
     /** Make an axiom node. The conclusion must be an instance of an axiom. */
-    virtual node make_axiom(const std::vector<ast> &conclusion, prover::range frng){
+    node make_axiom(const std::vector<ast> &conclusion, prover::range frng) override {
         int nargs = conclusion.size();
         std::vector<ast> largs(nargs);
         std::vector<ast> eqs;
@@ -2306,20 +2306,20 @@ class iz3proof_itp_impl : public iz3proof_itp {
         return capture_localization(itp);
     }
 
-    virtual node make_axiom(const std::vector<ast> &conclusion){
+    node make_axiom(const std::vector<ast> &conclusion) override {
         return make_axiom(conclusion,pv->range_full());
     }
 
     /** Make a Contra node. This rule takes a derivation of the form
         Gamma |- False and produces |- \/~Gamma. */
 
-    virtual node make_contra(node prem, const std::vector<ast> &conclusion){
+    node make_contra(node prem, const std::vector<ast> &conclusion) override {
         return prem;
     }
 
     /** Make hypothesis. Creates a node of the form P |- P. */
 
-    virtual node make_hypothesis(const ast &P){
+    node make_hypothesis(const ast &P) override {
         if(is_not(P))
             return make_hypothesis(arg(P,0));
         switch(get_term_type(P)){
@@ -2354,7 +2354,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
 
     /** Make a Reflexivity node. This rule produces |- x = x */
   
-    virtual node make_reflexivity(ast con){
+    node make_reflexivity(ast con) override {
         if(get_term_type(con) == LitA)
             return mk_false();
         if(get_term_type(con) == LitB)
@@ -2367,7 +2367,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     /** Make a Symmetry node. This takes a derivation of |- x = y and
         produces | y = x. Ditto for ~(x=y) */
 
-    virtual node make_symmetry(ast con, const ast &premcon, node prem){
+    node make_symmetry(ast con, const ast &premcon, node prem) override {
 #if 0
         ast x = arg(con,0);
         ast y = arg(con,1);
@@ -2394,7 +2394,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     /** Make a transitivity node. This takes derivations of |- x = y
         and |- y = z produces | x = z */
 
-    virtual node make_transitivity(const ast &x, const ast &y, const ast &z, node prem1, node prem2){
+    node make_transitivity(const ast &x, const ast &y, const ast &z, node prem1, node prem2) override {
 
         /* Interpolate the axiom x=y,y=z,-> x=z */
         ast p = make_equiv_rel(x,y);
@@ -2413,7 +2413,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     /** Make a congruence node. This takes derivations of |- x_i = y_i
         and produces |- f(x_1,...,x_n) = f(y_1,...,y_n) */
   
-    virtual node make_congruence(const ast &p, const ast &con, const ast &prem1){
+    node make_congruence(const ast &p, const ast &con, const ast &prem1) override {
         ast x = arg(p,0), y = arg(p,1);
         ast itp;
         LitType con_t = get_term_type(con);
@@ -2454,7 +2454,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     /** Make a congruence node. This takes derivations of |- x_i1 = y_i1, |- x_i2 = y_i2,...
         and produces |- f(...x_i1...x_i2...) = f(...y_i1...y_i2...) */
   
-    node make_congruence(const std::vector<ast> &p, const ast &con, const std::vector<ast> &prems){
+    node make_congruence(const std::vector<ast> &p, const ast &con, const std::vector<ast> &prems) override {
         if(p.size() == 0)
             throw proof_error();
         if(p.size() == 1)
@@ -2516,8 +2516,8 @@ class iz3proof_itp_impl : public iz3proof_itp {
 
     /** Make a farkas proof node. */
 
-    virtual node make_farkas(ast con, const std::vector<node> &prems, const std::vector<ast> &prem_cons,
+    node make_farkas(ast con, const std::vector<node> &prems, const std::vector<ast> &prem_cons,
-                             const std::vector<ast> &coeffs){
+                     const std::vector<ast> &coeffs) override {
 
         /* Compute the interpolant for the clause */
 
@@ -2619,7 +2619,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     }
   
     /* Make an axiom instance of the form |- x<=y, y<= x -> x =y */
-    virtual node make_leq2eq(ast x, ast y, const ast &xleqy, const ast &yleqx){
+    node make_leq2eq(ast x, ast y, const ast &xleqy, const ast &yleqx) override {
         ast con = make(Equal,x,y);
         ast itp;
         switch(get_term_type(con)){
@@ -2658,7 +2658,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     }
 
     /* Make an axiom instance of the form |- x = y -> x <= y */
-    virtual node make_eq2leq(ast x, ast y, const ast &xleqy){
+    node make_eq2leq(ast x, ast y, const ast &xleqy) override {
         ast itp;
         switch(get_term_type(xleqy)){
         case LitA:
@@ -2681,7 +2681,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
 
     /* Make an inference of the form t <= c |- t/d <= floor(c/d) where t
        is an affine term divisble by d and c is an integer constant */
-    virtual node make_cut_rule(const ast &tleqc, const ast &d, const ast &con, const ast &prem){
+    node make_cut_rule(const ast &tleqc, const ast &d, const ast &con, const ast &prem) override {
         ast itp = mk_false();
         switch(get_term_type(con)){
         case LitA:
@@ -2965,7 +2965,7 @@ class iz3proof_itp_impl : public iz3proof_itp {
     }  
 
     /* Return an interpolant from a proof of false */
-    ast interpolate(const node &pf){
+    ast interpolate(const node &pf) override {
         // proof of false must be a formula, with quantified symbols
 #ifndef BOGUS_QUANTS
         return close_universally(add_quants(z3_simplify(pf)));
@@ -3089,7 +3089,7 @@ public:
         m().inc_ref(sexists);
     }
 
-    ~iz3proof_itp_impl(){
+    ~iz3proof_itp_impl() override {
         m().dec_ref(contra);
         m().dec_ref(sum);
         m().dec_ref(rotate_sum);

src/interp/iz3translate.cpp

@@ -2068,7 +2068,7 @@ public:
 
     // We actually compute the interpolant here and then produce a proof consisting of just a lemma
 
-    iz3proof::node translate(ast proof, iz3proof &dst){
+    iz3proof::node translate(ast proof, iz3proof &dst) override {
         std::vector<ast> itps;
         scan_skolems(proof);
         for(int i = 0; i < frames -1; i++){
@@ -2114,7 +2114,7 @@ public:
         m().inc_ref(commute);
     }
 
-    ~iz3translation_full(){
+    ~iz3translation_full() override {
         m().dec_ref(commute);
     }
 };

src/interp/iz3translate_direct.cpp

@@ -1611,7 +1611,7 @@ public:
             // 1) Translate ast proof term to Zproof
             // 2) Translate Zproof to Iproof
 
-            Iproof::node translate(ast proof, Iproof &dst){
+            Iproof::node translate(ast proof, Iproof &dst) override {
                 iproof = &dst;
                 Iproof::node Ipf = translate_main(proof,0);  // builds result in dst
                 return Ipf;
@@ -1629,7 +1629,7 @@ public:
                     traced_lit = ast();
                 }
 
-            ~iz3translation_direct(){
+            ~iz3translation_direct() override {
                 for(hash_map<non_local_lits, non_local_lits *>::iterator
                         it = non_local_lits_unique.begin(),
                         en = non_local_lits_unique.end();

src/math/hilbert/heap_trie.h

@@ -81,14 +81,14 @@ class heap_trie {
         Value m_value;
     public:
         leaf(): node(leaf_t) {}
-        virtual ~leaf() {}
+        ~leaf() override {}
         Value const& get_value() const { return m_value; }
         void set_value(Value const& v) { m_value = v; }
-        virtual void display(std::ostream& out, unsigned indent) const {
+        void display(std::ostream& out, unsigned indent) const override {
             out << " value: " << m_value;
         }
-        virtual unsigned num_nodes() const { return 1; }
+        unsigned num_nodes() const override { return 1; }
-        virtual unsigned num_leaves() const { return this->ref_count()>0?1:0; }
+        unsigned num_leaves() const override { return this->ref_count()>0?1:0; }
     };
 
     typedef buffer<std::pair<Key,node*>, true, 2> children_t;
@@ -99,7 +99,7 @@ class heap_trie {
     public:
         trie(): node(trie_t) {}
 
-        virtual ~trie() {
+        ~trie() override {
         }
 
         node* find_or_insert(Key k, node* n) {
@@ -137,7 +137,7 @@ class heap_trie {
         children_t const& nodes() const { return m_nodes; }
         children_t & nodes() { return m_nodes; }
 
-        virtual void display(std::ostream& out, unsigned indent) const {
+        void display(std::ostream& out, unsigned indent) const override {
             for (unsigned j = 0; j < m_nodes.size(); ++j) {
                 if (j != 0 || indent > 0) {
                     out << "\n";
@@ -151,7 +151,7 @@ class heap_trie {
             }
         }
 
-        virtual unsigned num_nodes() const {
+        unsigned num_nodes() const override {
             unsigned sz = 1;
             for (unsigned j = 0; j < m_nodes.size(); ++j) {
                 sz += m_nodes[j].second->num_nodes();
@@ -159,7 +159,7 @@ class heap_trie {
             return sz;
         }
 
-        virtual unsigned num_leaves() const {
+        unsigned num_leaves() const override {
             unsigned sz = 0;
             for (unsigned j = 0; j < m_nodes.size(); ++j) {
                 sz += m_nodes[j].second->num_leaves();

src/math/hilbert/hilbert_basis.cpp

@@ -175,7 +175,7 @@ class hilbert_basis::value_index2 {
         hilbert_basis* hb;
         offset_t  m_value;
         checker(): hb(0) {}
-        virtual bool operator()(unsigned const& v) {            
+        bool operator()(unsigned const& v) override {
             if (m_value.m_offset != v) { //  && hb->is_subsumed(m_value, offset_t(v))) {
                 return true;
             }

src/math/polynomial/algebraic_numbers.cpp

@@ -1932,9 +1932,9 @@ namespace algebraic_numbers {
             imp & m_imp;
             polynomial::var2anum const & m_x2v;
             opt_var2basic(imp & i, polynomial::var2anum const & x2v):m_imp(i), m_x2v(x2v) {}
-            virtual unsynch_mpq_manager & m() const { return m_imp.qm(); }
+            unsynch_mpq_manager & m() const override { return m_imp.qm(); }
-            virtual bool contains(polynomial::var x) const { return m_x2v.contains(x); }
+            bool contains(polynomial::var x) const override { return m_x2v.contains(x); }
-            virtual mpq const & operator()(polynomial::var x) const {
+            mpq const & operator()(polynomial::var x) const override {
                 anum const & v = m_x2v(x);
                 if (!v.is_basic())
                     throw failed();
@@ -1949,9 +1949,9 @@ namespace algebraic_numbers {
             imp & m_imp;
             polynomial::var2anum const & m_x2v;
             var2basic(imp & i, polynomial::var2anum const & x2v):m_imp(i), m_x2v(x2v) {}
-            virtual unsynch_mpq_manager & m() const { return m_imp.qm(); }
+            unsynch_mpq_manager & m() const override { return m_imp.qm(); }
-            virtual bool contains(polynomial::var x) const { return m_x2v.contains(x) && m_x2v(x).is_basic(); }
+            bool contains(polynomial::var x) const override { return m_x2v.contains(x) && m_x2v(x).is_basic(); }
-            virtual mpq const & operator()(polynomial::var x) const {
+            mpq const & operator()(polynomial::var x) const override {
                 anum const & v = m_x2v(x);
                 SASSERT(v.is_basic());
                 TRACE("var2basic", tout << "getting value of x" << x << " -> " << m().to_string(m_imp.basic_value(v)) << "\n";);
@@ -1966,9 +1966,9 @@ namespace algebraic_numbers {
             imp & m_imp;
             polynomial::var2anum const & m_x2v;
             var2interval(imp & i, polynomial::var2anum const & x2v):m_imp(i), m_x2v(x2v) {}
-            virtual mpbqi_manager & m() const { return m_imp.bqim(); }
+            mpbqi_manager & m() const override { return m_imp.bqim(); }
-            virtual bool contains(polynomial::var x) const { return m_x2v.contains(x) && !m_x2v(x).is_basic(); }
+            bool contains(polynomial::var x) const override { return m_x2v.contains(x) && !m_x2v(x).is_basic(); }
-            virtual mpbqi const & operator()(polynomial::var x) const {
+            mpbqi const & operator()(polynomial::var x) const override {
                 anum const & v = m_x2v(x);
                 SASSERT(!v.is_basic());
                 return v.to_algebraic()->m_interval;
@@ -2220,9 +2220,9 @@ namespace algebraic_numbers {
                 m_x(x),
                 m_v(v) {
             }
-            virtual manager & m() const { return m_am; }
+            manager & m() const override { return m_am; }
-            virtual bool contains(polynomial::var x) const { return x == m_x || m_x2v.contains(x); }
+            bool contains(polynomial::var x) const override { return x == m_x || m_x2v.contains(x); }
-            virtual anum const & operator()(polynomial::var x) const {
+            anum const & operator()(polynomial::var x) const override {
                 if (x == m_x)
                     return m_v;
                 else
@@ -2553,9 +2553,9 @@ namespace algebraic_numbers {
                 m_x2v(x2v),
                 m_v(v) {
             }
-            virtual manager & m() const { return m_am; }
+            manager & m() const override { return m_am; }
-            virtual bool contains(polynomial::var x) const { return true; }
+            bool contains(polynomial::var x) const override { return true; }
-            virtual anum const & operator()(polynomial::var x) const {
+            anum const & operator()(polynomial::var x) const override {
                 if (m_x2v.contains(x))
                     return m_x2v(x);
                 else

src/math/polynomial/polynomial.cpp

@@ -6350,9 +6350,9 @@ namespace polynomial {
                 m_var_pos(buffer, xs_sz, xs),
                 m_vs(vs) {
             }
-            virtual unsynch_mpq_manager & m() const { UNREACHABLE(); static unsynch_mpq_manager m; return m; }
+            unsynch_mpq_manager & m() const override { UNREACHABLE(); static unsynch_mpq_manager m; return m; }
-            virtual bool contains(var x) const { return m_var_pos(x) != UINT_MAX; }
+            bool contains(var x) const override { return m_var_pos(x) != UINT_MAX; }
-            virtual mpq const & operator()(var x) const { return m_vs[m_var_pos(x)]; }
+            mpq const & operator()(var x) const override { return m_vs[m_var_pos(x)]; }
         };
 
         polynomial * substitute(polynomial const * p, unsigned xs_sz, var const * xs, mpq const * vs) {
@@ -6527,9 +6527,9 @@ namespace polynomial {
             numeral const & m_val;
         public:
             single_var2value(numeral_manager & m, var x, numeral const & val):m_manager(m), m_x(x), m_val(val) {}
-            virtual numeral_manager & m() const { return m_manager; }
+            numeral_manager & m() const override { return m_manager; }
-            virtual bool contains(var x) const { return m_x == x; }
+            bool contains(var x) const override { return m_x == x; }
-            virtual numeral const & operator()(var x) const { SASSERT(m_x == x); return m_val; }
+            numeral const & operator()(var x) const override { SASSERT(m_x == x); return m_val; }
         };
 
         void univ_eval(polynomial const * p, var x, numeral const & val, numeral & r) {

src/math/polynomial/upolynomial_factorization_int.h

@@ -322,7 +322,7 @@ namespace upolynomial {
         /**
            \brief Filter the ones not in the degree set.
         */
-        bool filter_current() const {
+        bool filter_current() const override {
             
             // select only the ones that have degrees in the degree set
             if (!m_degree_set.in_set(current_degree())) {

src/math/realclosure/realclosure.cpp

@@ -344,13 +344,13 @@ namespace realclosure {
     // ---------------------------------
 
     struct mk_pi_interval : public mk_interval {
-        virtual void operator()(unsigned k, mpqi_manager & im, mpqi_manager::interval & r) {
+        void operator()(unsigned k, mpqi_manager & im, mpqi_manager::interval & r) override {
             im.pi(k, r);
         }
     };
 
     struct mk_e_interval : public mk_interval {
-        virtual void operator()(unsigned k, mpqi_manager & im, mpqi_manager::interval & r) {
+        void operator()(unsigned k, mpqi_manager & im, mpqi_manager::interval & r) override {
             im.e(k, r);
         }
     };

src/math/subpaving/subpaving.cpp

@@ -38,22 +38,22 @@ namespace subpaving {
         CTX m_ctx;
     public:
         context_wrapper(reslimit& lim, typename CTX::numeral_manager & m, params_ref const & p, small_object_allocator * a):m_ctx(lim, m, p, a) {}
-        virtual ~context_wrapper() {}
+        ~context_wrapper() override {}
-        virtual unsigned num_vars() const { return m_ctx.num_vars(); }
+        unsigned num_vars() const override { return m_ctx.num_vars(); }
-        virtual var mk_var(bool is_int) { return m_ctx.mk_var(is_int); }
+        var mk_var(bool is_int) override { return m_ctx.mk_var(is_int); }
-        virtual bool is_int(var x) const { return m_ctx.is_int(x); }
+        bool is_int(var x) const override { return m_ctx.is_int(x); }
-        virtual var mk_monomial(unsigned sz, power const * pws) { return m_ctx.mk_monomial(sz, pws); }
+        var mk_monomial(unsigned sz, power const * pws) override { return m_ctx.mk_monomial(sz, pws); }
-        virtual void inc_ref(ineq * a) { m_ctx.inc_ref(reinterpret_cast<typename CTX::ineq*>(a)); }
+        void inc_ref(ineq * a) override { m_ctx.inc_ref(reinterpret_cast<typename CTX::ineq*>(a)); }
-        virtual void dec_ref(ineq * a) { m_ctx.dec_ref(reinterpret_cast<typename CTX::ineq*>(a)); }
+        void dec_ref(ineq * a) override { m_ctx.dec_ref(reinterpret_cast<typename CTX::ineq*>(a)); }
-        virtual void add_clause(unsigned sz, ineq * const * atoms) { m_ctx.add_clause(sz, reinterpret_cast<typename CTX::ineq * const *>(atoms)); }
+        void add_clause(unsigned sz, ineq * const * atoms) override { m_ctx.add_clause(sz, reinterpret_cast<typename CTX::ineq * const *>(atoms)); }
-        virtual void display_constraints(std::ostream & out, bool use_star) const { m_ctx.display_constraints(out, use_star); }
+        void display_constraints(std::ostream & out, bool use_star) const override { m_ctx.display_constraints(out, use_star); }
-        virtual void set_display_proc(display_var_proc * p) { m_ctx.set_display_proc(p); }
+        void set_display_proc(display_var_proc * p) override { m_ctx.set_display_proc(p); }
-        virtual void reset_statistics() { m_ctx.reset_statistics(); }
+        void reset_statistics() override { m_ctx.reset_statistics(); }
-        virtual void collect_statistics(statistics & st) const { m_ctx.collect_statistics(st); }
+        void collect_statistics(statistics & st) const override { m_ctx.collect_statistics(st); }
-        virtual void collect_param_descrs(param_descrs & r) { m_ctx.collect_param_descrs(r); }
+        void collect_param_descrs(param_descrs & r) override { m_ctx.collect_param_descrs(r); }
-        virtual void updt_params(params_ref const & p) { m_ctx.updt_params(p); }
+        void updt_params(params_ref const & p) override { m_ctx.updt_params(p); }
-        virtual void operator()() { m_ctx(); }
+        void operator()() override { m_ctx(); }
-        virtual void display_bounds(std::ostream & out) const { m_ctx.display_bounds(out); }
+        void display_bounds(std::ostream & out) const override { m_ctx.display_bounds(out); }
     };
 
     class context_mpq_wrapper : public context_wrapper<context_mpq> {
@@ -66,11 +66,11 @@ namespace subpaving {
             m_as(m) 
         {}
 
-        virtual ~context_mpq_wrapper() {}
+        ~context_mpq_wrapper() override {}
 
-        virtual unsynch_mpq_manager & qm() const { return m_ctx.nm(); }
+        unsynch_mpq_manager & qm() const override { return m_ctx.nm(); }
 
-        virtual var mk_sum(mpz const & c, unsigned sz, mpz const * as, var const * xs) {
+        var mk_sum(mpz const & c, unsigned sz, mpz const * as, var const * xs) override {
             m_as.reserve(sz);
             for (unsigned i = 0; i < sz; i++) {
                 m_ctx.nm().set(m_as[i], as[i]);
@@ -78,7 +78,7 @@ namespace subpaving {
             m_ctx.nm().set(m_c, c);
             return m_ctx.mk_sum(m_c, sz, m_as.c_ptr(), xs);
         }
-        virtual ineq * mk_ineq(var x, mpq const & k, bool lower, bool open) { 
+        ineq * mk_ineq(var x, mpq const & k, bool lower, bool open) override {
             return reinterpret_cast<ineq*>(m_ctx.mk_ineq(x, k, lower, open)); 
         }
     };
@@ -108,11 +108,11 @@ namespace subpaving {
             m_q2(m_qm) {
         }
 
-        virtual ~context_mpf_wrapper() {}
+        ~context_mpf_wrapper() override {}
 
-        virtual unsynch_mpq_manager & qm() const { return m_qm; }
+        unsynch_mpq_manager & qm() const override { return m_qm; }
 
-        virtual var mk_sum(mpz const & c, unsigned sz, mpz const * as, var const * xs) {
+        var mk_sum(mpz const & c, unsigned sz, mpz const * as, var const * xs) override {
             try {
                 m_as.reserve(sz);
                 for (unsigned i = 0; i < sz; i++) {
@@ -125,7 +125,7 @@ namespace subpaving {
                 throw subpaving::exception();
             }
         }
-        virtual ineq * mk_ineq(var x, mpq const & k, bool lower, bool open) { 
+        ineq * mk_ineq(var x, mpq const & k, bool lower, bool open) override {
             try {
                 f2n<mpf_manager> & m = m_ctx.nm();
                 if (lower)
@@ -165,11 +165,11 @@ namespace subpaving {
             m_qm(qm) {
         }
 
-        virtual ~context_hwf_wrapper() {}
+        ~context_hwf_wrapper() override {}
 
-        virtual unsynch_mpq_manager & qm() const { return m_qm; }
+        unsynch_mpq_manager & qm() const override { return m_qm; }
 
-        virtual var mk_sum(mpz const & c, unsigned sz, mpz const * as, var const * xs) {
+        var mk_sum(mpz const & c, unsigned sz, mpz const * as, var const * xs) override {
             try {
                 m_as.reserve(sz);
                 for (unsigned i = 0; i < sz; i++) {
@@ -182,7 +182,7 @@ namespace subpaving {
                 throw subpaving::exception();
             }
         }
-        virtual ineq * mk_ineq(var x, mpq const & k, bool lower, bool open) { 
+        ineq * mk_ineq(var x, mpq const & k, bool lower, bool open) override {
             try {
                 f2n<hwf_manager> & m = m_ctx.nm();
                 if (lower)
@@ -223,11 +223,11 @@ namespace subpaving {
             m_z2(m_qm) {
         }
 
-        virtual ~context_fpoint_wrapper() {}
+        ~context_fpoint_wrapper() override {}
 
-        virtual unsynch_mpq_manager & qm() const { return m_qm; }
+        unsynch_mpq_manager & qm() const override { return m_qm; }
 
-        virtual var mk_sum(mpz const & c, unsigned sz, mpz const * as, var const * xs) {
+        var mk_sum(mpz const & c, unsigned sz, mpz const * as, var const * xs) override {
             try {
                 m_as.reserve(sz);
                 for (unsigned i = 0; i < sz; i++) {
@@ -241,7 +241,7 @@ namespace subpaving {
             }
         }
         
-        virtual ineq * mk_ineq(var x, mpq const & k, bool lower, bool open) { 
+        ineq * mk_ineq(var x, mpq const & k, bool lower, bool open) override {
             try {
                 typename context_fpoint::numeral_manager & m = this->m_ctx.nm();
                 if (lower)

src/math/subpaving/subpaving_t_def.h

@@ -36,7 +36,7 @@ public:
         context_t<C>::node_selector(ctx) {
     }
 
-    virtual node * operator()(node * front, node * back) {
+    node * operator()(node * front, node * back) override {
         return back;
     }
 };
@@ -80,7 +80,7 @@ public:
     }
 
     // Return the next variable to branch.
-    virtual var operator()(typename context_t<C>::node * n) {
+    var operator()(typename context_t<C>::node * n) override {
         typename context_t<C>::numeral_manager & nm = this->ctx()->nm();
         SASSERT(this->ctx()->num_vars() > 0);
         var x = this->ctx()->splitting_var(n);
@@ -197,7 +197,7 @@ public:
         SASSERT(m_delta < INT_MAX);
     }
 
-    virtual void operator()(node * n, var x) {
+    void operator()(node * n, var x) override {
         SASSERT(!n->inconsistent());
         numeral_manager & nm = this->ctx()->nm();
         node * left   = this->mk_node(n);

src/math/subpaving/tactic/subpaving_tactic.cpp

@@ -40,7 +40,7 @@ class subpaving_tactic : public tactic {
         
         ast_manager & m() const { return m_inv.get_manager(); }
         
-        virtual void operator()(std::ostream & out, subpaving::var x) const { 
+        void operator()(std::ostream & out, subpaving::var x) const override {
             expr * t = m_inv.get(x, 0);
             if (t != 0)
                 out << mk_ismt2_pp(t, m());
@@ -216,36 +216,36 @@ public:
         m_params(p) {
     }
 
-    virtual ~subpaving_tactic() {
+    ~subpaving_tactic() override {
         dealloc(m_imp);
     }
 
-    virtual tactic * translate(ast_manager & m) {
+    tactic * translate(ast_manager & m) override {
         return alloc(subpaving_tactic, m, m_params);
     }
 
-    virtual void updt_params(params_ref const & p) {
+    void updt_params(params_ref const & p) override {
         m_params = p;
         m_imp->updt_params(p);
     }
 
-    virtual void collect_param_descrs(param_descrs & r) {        
+    void collect_param_descrs(param_descrs & r) override {
         m_imp->collect_param_descrs(r);
     }
 
-    virtual void collect_statistics(statistics & st) const {
+    void collect_statistics(statistics & st) const override {
         st.copy(m_stats);
     }
 
-    virtual void reset_statistics() {
+    void reset_statistics() override {
         m_stats.reset();
     }
 
-    virtual void operator()(goal_ref const & in, 
+    void operator()(goal_ref const & in,
                     goal_ref_buffer & result,
                     model_converter_ref & mc,
                     proof_converter_ref & pc,
-                            expr_dependency_ref & core) {
+                    expr_dependency_ref & core) override {
         try {
             m_imp->process(*in);
             m_imp->collect_statistics(m_stats);
@@ -261,7 +261,7 @@ public:
         }
     }
     
-    virtual void cleanup() {
+    void cleanup() override {
         ast_manager & m = m_imp->m();
         dealloc(m_imp);
         m_imp = alloc(imp, m, m_params);

src/muz/base/dl_context.cpp

@@ -90,10 +90,10 @@ namespace datalog {
             return idx;
         }
 
-        virtual unsigned get_constant_count() const {
+        unsigned get_constant_count() const override {
             return m_el_names.size();
         }
-        virtual void print_element(finite_element el_num, std::ostream & out) {
+        void print_element(finite_element el_num, std::ostream & out) override {
             if (el_num>=m_el_names.size()) {
                 out << el_num;
                 return;
@@ -132,10 +132,10 @@ namespace datalog {
             }
             return idx;
         }
-        virtual unsigned get_constant_count() const {
+        unsigned get_constant_count() const override {
             return m_el_names.size();
         }
-        virtual void print_element(finite_element el_num, std::ostream & out) {
+        void print_element(finite_element el_num, std::ostream & out) override {
             if (el_num >= m_el_names.size()) {
                 out << "<unk " << m_sort->get_name() << ":" << el_num << '>';
                 return;
@@ -159,9 +159,9 @@ namespace datalog {
     public:
         restore_rules(rule_set& r): m_old_rules(alloc(rule_set, r)) {}
 
-        virtual ~restore_rules() {}
+        ~restore_rules() override {}
         
-        virtual void undo(context& ctx) {
+        void undo(context& ctx) override {
             ctx.replace_rules(*m_old_rules);
             reset();
         }
@@ -173,8 +173,8 @@ namespace datalog {
         unsigned m_old_size;
     public:
         restore_vec_size_trail(Vec& v): m_vector(v), m_old_size(v.size()) {}
-        virtual ~restore_vec_size_trail() {}
+        ~restore_vec_size_trail() override {}
-        virtual void undo(Ctx& ctx) { m_vector.shrink(m_old_size); }
+        void undo(Ctx& ctx) override { m_vector.shrink(m_old_size); }
     };
 
     void context::push() {

src/muz/base/dl_context.h

@@ -110,7 +110,7 @@ namespace datalog {
     class rel_context_base : public engine_base {
     public:
         rel_context_base(ast_manager& m, char const* name): engine_base(m, name) {}
-        virtual ~rel_context_base() {}
+        ~rel_context_base() override {}
         virtual relation_manager & get_rmanager() = 0;
         virtual const relation_manager & get_rmanager() const = 0;
         virtual relation_base & get_relation(func_decl * pred) = 0;
@@ -146,9 +146,9 @@ namespace datalog {
             context const& ctx;
         public:
             contains_pred(context& ctx): ctx(ctx) {}
-            virtual ~contains_pred() {}
+            ~contains_pred() override {}
             
-            virtual bool operator()(expr* e) {
+            bool operator()(expr* e) override {
                 return ctx.is_predicate(e);
             }
         };

src/muz/base/dl_util.cpp

@@ -385,7 +385,7 @@ namespace datalog {
     public:
         skip_model_converter() {}
  
-        virtual model_converter * translate(ast_translation & translator) { 
+        model_converter * translate(ast_translation & translator) override {
             return alloc(skip_model_converter);
         }
 
@@ -394,12 +394,12 @@ namespace datalog {
     model_converter* mk_skip_model_converter() { return alloc(skip_model_converter); }
 
     class skip_proof_converter : public proof_converter {
-        virtual void operator()(ast_manager & m, unsigned num_source, proof * const * source, proof_ref & result) {
+        void operator()(ast_manager & m, unsigned num_source, proof * const * source, proof_ref & result) override {
             SASSERT(num_source == 1);
             result = source[0];
         }
 
-        virtual proof_converter * translate(ast_translation & translator) {
+        proof_converter * translate(ast_translation & translator) override {
             return alloc(skip_proof_converter);
         }
 

src/muz/bmc/dl_bmc_engine.h

@@ -55,18 +55,18 @@ namespace datalog {
     public:
         bmc(context& ctx);
 
-        ~bmc();
+        ~bmc() override;
 
-        lbool query(expr* query);
+        lbool query(expr* query) override;
 
-        void display_certificate(std::ostream& out) const;
+        void display_certificate(std::ostream& out) const override;
 
-        void collect_statistics(statistics& st) const;
+        void collect_statistics(statistics& st) const override;
 
-        void reset_statistics(); 
+        void reset_statistics() override;
-        void get_rules_along_trace(datalog::rule_ref_vector& rules);
+        void get_rules_along_trace(datalog::rule_ref_vector& rules) override;
 
-        expr_ref get_answer();
+        expr_ref get_answer() override;
 
         // direct access to (new) non-linear compiler.
         void compile(rule_set const& rules, expr_ref_vector& fmls, unsigned level);

src/muz/clp/clp_context.h

@@ -32,12 +32,12 @@ namespace datalog {
         imp* m_imp;
     public:
         clp(context& ctx);
-        ~clp();
+        ~clp() override;
-        virtual lbool query(expr* query);
+        lbool query(expr* query) override;
-        virtual void reset_statistics();
+        void reset_statistics() override;
-        virtual void collect_statistics(statistics& st) const;
+        void collect_statistics(statistics& st) const override;
-        virtual void display_certificate(std::ostream& out) const;        
+        void display_certificate(std::ostream& out) const override;
-        virtual expr_ref get_answer();
+        expr_ref get_answer() override;
     };
 };
 

src/muz/ddnf/ddnf.h

@@ -35,12 +35,12 @@ namespace datalog {
         imp* m_imp;
     public:
         ddnf(context& ctx);
-        ~ddnf();
+        ~ddnf() override;
-        virtual lbool query(expr* query);
+        lbool query(expr* query) override;
-        virtual void reset_statistics();
+        void reset_statistics() override;
-        virtual void collect_statistics(statistics& st) const;
+        void collect_statistics(statistics& st) const override;
-        virtual void display_certificate(std::ostream& out) const;        
+        void display_certificate(std::ostream& out) const override;
-        virtual expr_ref get_answer();
+        expr_ref get_answer() override;
     };
 
     class ddnf_node;

src/muz/duality/duality_dl_interface.h

@@ -41,33 +41,33 @@ namespace Duality {
 
     public:
         dl_interface(datalog::context& ctx); 
-        ~dl_interface();
+        ~dl_interface() override;
         
-        lbool query(expr* query);
+        lbool query(expr* query) override;
 
-        void cancel();
+        void cancel() override;
 
-        void cleanup();
+        void cleanup() override;
 
-        void display_certificate(std::ostream& out) const;
+        void display_certificate(std::ostream& out) const override;
 
-        void collect_statistics(statistics& st) const;
+        void collect_statistics(statistics& st) const override;
 
-        void reset_statistics();
+        void reset_statistics() override;
 
-        expr_ref get_answer();
+        expr_ref get_answer() override;
 
-        unsigned get_num_levels(func_decl* pred);
+        unsigned get_num_levels(func_decl* pred) override;
 
-        expr_ref get_cover_delta(int level, func_decl* pred);
+        expr_ref get_cover_delta(int level, func_decl* pred) override;
        
-        void add_cover(int level, func_decl* pred, expr* property);
+        void add_cover(int level, func_decl* pred, expr* property) override;
                
-        void updt_params();
+        void updt_params() override;
 
-        model_ref get_model();
+        model_ref get_model() override;
 
-        proof_ref get_proof();
+        proof_ref get_proof() override;
         
         duality_data *dd(){return _d;}
 

src/muz/fp/datalog_parser.cpp

@@ -494,7 +494,7 @@ public:
     {
     }
 
-    virtual bool parse_file(char const * filename) {
+    bool parse_file(char const * filename) override {
         reset();
         if (filename != 0) {            
             set_path(filename);
@@ -510,7 +510,7 @@ public:
         }
     }
 
-    virtual bool parse_string(char const * string) {
+    bool parse_string(char const * string) override {
         reset();
         std::string s(string);
         std::istringstream is(s);
@@ -1200,13 +1200,13 @@ public:
           m_short_sort(ctx.get_manager()),
           m_use_map_names(ctx.use_map_names()) {
     }
-    ~wpa_parser_impl() {
+    ~wpa_parser_impl() override {
         reset_dealloc_values(m_sort_contents);
     }
     void reset() {
     }
 
-    virtual bool parse_directory(char const * path) {
+    bool parse_directory(char const * path) override {
         bool result = false;
         try {
             result = parse_directory_core(path);

src/muz/fp/dl_cmds.cpp

@@ -166,10 +166,10 @@ public:
         m_arg_idx(0),
         m_t(0),
         m_bound(UINT_MAX) {}
-    virtual char const * get_usage() const { return "(forall (q) (=> (and body) head)) :optional-name :optional-recursion-bound"; }
+    char const * get_usage() const override { return "(forall (q) (=> (and body) head)) :optional-name :optional-recursion-bound"; }
-    virtual char const * get_descr(cmd_context & ctx) const { return "add a Horn rule."; }
+    char const * get_descr(cmd_context & ctx) const override { return "add a Horn rule."; }
-    virtual unsigned get_arity() const { return VAR_ARITY; }
+    unsigned get_arity() const override { return VAR_ARITY; }
-    virtual cmd_arg_kind next_arg_kind(cmd_context & ctx) const { 
+    cmd_arg_kind next_arg_kind(cmd_context & ctx) const override {
         switch(m_arg_idx) {
         case 0: return CPK_EXPR;
         case 1: return CPK_SYMBOL;
@@ -177,23 +177,23 @@ public:
         default: return CPK_SYMBOL;
         }
     }
-    virtual void set_next_arg(cmd_context & ctx, expr * t) {
+    void set_next_arg(cmd_context & ctx, expr * t) override {
         m_t = t;
         m_arg_idx++;
     }
-    virtual void set_next_arg(cmd_context & ctx, symbol const & s) {
+    void set_next_arg(cmd_context & ctx, symbol const & s) override {
         m_name = s;
         m_arg_idx++;
     }
-    virtual void set_next_arg(cmd_context & ctx, unsigned bound) {
+    void set_next_arg(cmd_context & ctx, unsigned bound) override {
         m_bound = bound;
         m_arg_idx++;
     }
-    virtual void reset(cmd_context & ctx) { m_dl_ctx->reset(); prepare(ctx); m_t = nullptr; }
+    void reset(cmd_context & ctx) override { m_dl_ctx->reset(); prepare(ctx); m_t = nullptr; }
-    virtual void prepare(cmd_context& ctx) { m_arg_idx = 0; m_name = symbol::null; m_bound = UINT_MAX; }
+    void prepare(cmd_context& ctx) override { m_arg_idx = 0; m_name = symbol::null; m_bound = UINT_MAX; }
-    virtual void finalize(cmd_context & ctx) { 
+    void finalize(cmd_context & ctx) override {
     }
-    virtual void execute(cmd_context & ctx) {
+    void execute(cmd_context & ctx) override {
         if (!m_t) throw cmd_exception("invalid rule, expected formula");
         m_dl_ctx->add_rule(m_t, m_name, m_bound);
     }
@@ -208,17 +208,17 @@ public:
         m_dl_ctx(dl_ctx),
         m_target(0) {
     }
-    virtual char const * get_usage() const { return "predicate"; }
+    char const * get_usage() const override { return "predicate"; }
-    virtual char const * get_main_descr() const { 
+    char const * get_main_descr() const override {
         return "pose a query to a predicate based on the Horn rules."; 
     }
 
-    virtual cmd_arg_kind next_arg_kind(cmd_context & ctx) const { 
+    cmd_arg_kind next_arg_kind(cmd_context & ctx) const override {
         if (m_target == 0) return CPK_FUNC_DECL;
         return parametric_cmd::next_arg_kind(ctx);
     }
 
-    virtual void set_next_arg(cmd_context & ctx, func_decl* t) {
+    void set_next_arg(cmd_context & ctx, func_decl* t) override {
         m_target = t;
         if (t->get_family_id() != null_family_id) {
             throw cmd_exception("Invalid query argument, expected uinterpreted function name, but argument is interpreted");
@@ -229,13 +229,13 @@ public:
         }
     }
 
-    virtual void prepare(cmd_context & ctx) { 
+    void prepare(cmd_context & ctx) override {
         ctx.m(); // ensure manager is initialized.
         parametric_cmd::prepare(ctx);
         m_target   = 0; 
     }
 
-    virtual void execute(cmd_context& ctx) {
+    void execute(cmd_context& ctx) override {
         if (m_target == 0) {
             throw cmd_exception("invalid query command, argument expected");
         }
@@ -321,7 +321,7 @@ public:
         m_target = 0;
     }
 
-    virtual void init_pdescrs(cmd_context & ctx, param_descrs & p) {
+    void init_pdescrs(cmd_context & ctx, param_descrs & p) override {
         m_dl_ctx->dlctx().collect_params(p);
     }
    
@@ -385,30 +385,30 @@ public:
         m_dl_ctx(dl_ctx),
         m_domain(0) {}
 
-    virtual char const * get_usage() const { return "<symbol> (<arg1 sort> ...) <representation>*"; }
+    char const * get_usage() const override { return "<symbol> (<arg1 sort> ...) <representation>*"; }
-    virtual char const * get_descr(cmd_context & ctx) const { return "declare new relation"; }
+    char const * get_descr(cmd_context & ctx) const override { return "declare new relation"; }
-    virtual unsigned get_arity() const { return VAR_ARITY; }
+    unsigned get_arity() const override { return VAR_ARITY; }
 
-    virtual void prepare(cmd_context & ctx) {
+    void prepare(cmd_context & ctx) override {
         ctx.m(); // ensure manager is initialized.
         m_arg_idx = 0; 
         m_query_arg_idx = 0; 
         m_domain.reset();
         m_kinds.reset();
     }
-    virtual cmd_arg_kind next_arg_kind(cmd_context & ctx) const { 
+    cmd_arg_kind next_arg_kind(cmd_context & ctx) const override {
         switch(m_query_arg_idx++) {
         case 0: return CPK_SYMBOL;     // relation name
         case 1: return CPK_SORT_LIST;  // arguments
         default: return CPK_SYMBOL;    // optional representation specification
         }
     }
-    virtual void set_next_arg(cmd_context & ctx, unsigned num, sort * const * slist) {
+    void set_next_arg(cmd_context & ctx, unsigned num, sort * const * slist) override {
         m_domain.reset();
         m_domain.append(num, slist);
         m_arg_idx++;
     }
-    virtual void set_next_arg(cmd_context & ctx, symbol const & s) {
+    void set_next_arg(cmd_context & ctx, symbol const & s) override {
         if(m_arg_idx==0) {
             m_rel_name = s;
         }
@@ -418,7 +418,7 @@ public:
         }
         m_arg_idx++;
     }
-    virtual void execute(cmd_context & ctx) {
+    void execute(cmd_context & ctx) override {
         if(m_arg_idx<2) {
             throw cmd_exception("at least 2 arguments expected");
         }
@@ -444,15 +444,15 @@ public:
         m_dl_ctx(dl_ctx)
     {}
     
-    virtual char const * get_usage() const { return "<symbol> <sort>"; }
+    char const * get_usage() const override { return "<symbol> <sort>"; }
-    virtual char const * get_descr(cmd_context & ctx) const { return "declare constant as variable"; }
+    char const * get_descr(cmd_context & ctx) const override { return "declare constant as variable"; }
-    virtual unsigned get_arity() const { return 2; }
+    unsigned get_arity() const override { return 2; }
 
-    virtual void prepare(cmd_context & ctx) {
+    void prepare(cmd_context & ctx) override {
         ctx.m(); // ensure manager is initialized.
         m_arg_idx = 0; 
     }
-    virtual cmd_arg_kind next_arg_kind(cmd_context & ctx) const { 
+    cmd_arg_kind next_arg_kind(cmd_context & ctx) const override {
         SASSERT(m_arg_idx <= 1);
         if (m_arg_idx == 0) {
             return CPK_SYMBOL;  
@@ -460,17 +460,17 @@ public:
         return CPK_SORT; 
     }
 
-    virtual void set_next_arg(cmd_context & ctx, sort* s) {
+    void set_next_arg(cmd_context & ctx, sort* s) override {
         m_var_sort = s;
         ++m_arg_idx;
     }
 
-    virtual void set_next_arg(cmd_context & ctx, symbol const & s) {
+    void set_next_arg(cmd_context & ctx, symbol const & s) override {
         m_var_name = s;   
         ++m_arg_idx;
     }
 
-    virtual void execute(cmd_context & ctx) {
+    void execute(cmd_context & ctx) override {
         ast_manager& m = ctx.m();
         func_decl_ref var(m.mk_func_decl(m_var_name, 0, static_cast<sort*const*>(0), m_var_sort), m);
         ctx.insert(var);
@@ -489,10 +489,10 @@ public:
       m_dl_ctx(dl_ctx)
     {}
 
-    virtual char const * get_usage() const { return ""; }
+    char const * get_usage() const override { return ""; }
-    virtual char const * get_descr(cmd_context & ctx) const { return "push the fixedpoint context"; }
+    char const * get_descr(cmd_context & ctx) const override { return "push the fixedpoint context"; }
-    virtual unsigned get_arity() const { return 0; }
+    unsigned get_arity() const override { return 0; }
-    virtual void execute(cmd_context & ctx) {
+    void execute(cmd_context & ctx) override {
         m_dl_ctx->push();
     }
 };
@@ -508,10 +508,10 @@ public:
       m_dl_ctx(dl_ctx)
     {}
 
-    virtual char const * get_usage() const { return ""; }
+    char const * get_usage() const override { return ""; }
-    virtual char const * get_descr(cmd_context & ctx) const { return "pop the fixedpoint context"; }
+    char const * get_descr(cmd_context & ctx) const override { return "pop the fixedpoint context"; }
-    virtual unsigned get_arity() const { return 0; }
+    unsigned get_arity() const override { return 0; }
-    virtual void execute(cmd_context & ctx) {
+    void execute(cmd_context & ctx) override {
         m_dl_ctx->pop();
     }
 };

src/muz/fp/dl_register_engine.h

@@ -27,8 +27,8 @@ namespace datalog {
         context* m_ctx;
     public:
         register_engine();
-        engine_base* mk_engine(DL_ENGINE engine_type);
+        engine_base* mk_engine(DL_ENGINE engine_type) override;
-        void set_context(context* ctx) { m_ctx = ctx; }
+        void set_context(context* ctx) override { m_ctx = ctx; }
     };
 
 }

src/muz/fp/horn_tactic.cpp

@@ -365,43 +365,43 @@ public:
         m_imp = alloc(imp, t, m, p);
     }
 
-    virtual tactic * translate(ast_manager & m) {
+    tactic * translate(ast_manager & m) override {
         return alloc(horn_tactic, m_is_simplify, m, m_params);
     }
         
-    virtual ~horn_tactic() {
+    ~horn_tactic() override {
         dealloc(m_imp);
     }
 
-    virtual void updt_params(params_ref const & p) {
+    void updt_params(params_ref const & p) override {
         m_params = p;
         m_imp->updt_params(p);
     }
 
    
-    virtual void collect_param_descrs(param_descrs & r) {
+    void collect_param_descrs(param_descrs & r) override {
         m_imp->collect_param_descrs(r);
     }
     
-    virtual void operator()(goal_ref const & in, 
+    void operator()(goal_ref const & in,
                     goal_ref_buffer & result,
                     model_converter_ref & mc,
                     proof_converter_ref & pc,
-                            expr_dependency_ref & core) {
+                    expr_dependency_ref & core) override {
         (*m_imp)(in, result, mc, pc, core);
     }
     
-    virtual void collect_statistics(statistics & st) const {
+    void collect_statistics(statistics & st) const override {
         m_imp->collect_statistics(st);
         st.copy(m_stats);
     }
 
-    virtual void reset_statistics() {
+    void reset_statistics() override {
         m_stats.reset();
         m_imp->reset_statistics();
     }
     
-    virtual void cleanup() {
+    void cleanup() override {
         ast_manager & m = m_imp->m;
         m_imp->collect_statistics(m_stats);
         dealloc(m_imp);

src/muz/pdr/pdr_dl_interface.h

@@ -47,29 +47,29 @@ namespace pdr {
 
     public:
         dl_interface(datalog::context& ctx); 
-        ~dl_interface();
+        ~dl_interface() override;
         
-        virtual lbool query(expr* query);
+        lbool query(expr* query) override;
 
-        virtual void display_certificate(std::ostream& out) const;
+        void display_certificate(std::ostream& out) const override;
 
-        virtual void collect_statistics(statistics& st) const;
+        void collect_statistics(statistics& st) const override;
 
-        virtual void reset_statistics();
+        void reset_statistics() override;
 
-        virtual expr_ref get_answer();
+        expr_ref get_answer() override;
 
-        virtual unsigned get_num_levels(func_decl* pred);
+        unsigned get_num_levels(func_decl* pred) override;
 
-        virtual expr_ref get_cover_delta(int level, func_decl* pred);
+        expr_ref get_cover_delta(int level, func_decl* pred) override;
        
-        virtual void add_cover(int level, func_decl* pred, expr* property);
+        void add_cover(int level, func_decl* pred, expr* property) override;
                
-        virtual void updt_params();
+        void updt_params() override;
 
-        virtual model_ref get_model();
+        model_ref get_model() override;
 
-        virtual proof_ref get_proof();
+        proof_ref get_proof() override;
         
     };
 }

src/muz/pdr/pdr_generalizers.h

@@ -30,8 +30,8 @@ namespace pdr {
         unsigned m_failure_limit;
     public:
         core_bool_inductive_generalizer(context& ctx, unsigned failure_limit) : core_generalizer(ctx), m_failure_limit(failure_limit) {}
-        virtual ~core_bool_inductive_generalizer() {}
+        ~core_bool_inductive_generalizer() override {}
-        virtual void operator()(model_node& n, expr_ref_vector& core, bool& uses_level);
+        void operator()(model_node& n, expr_ref_vector& core, bool& uses_level) override;
     };
 
     template <typename T>
@@ -61,17 +61,17 @@ namespace pdr {
         bool substitute_alias(rational const&r, expr* x, expr* e, expr_ref& result);
     public:
         core_arith_inductive_generalizer(context& ctx);
-        virtual ~core_arith_inductive_generalizer() {}
+        ~core_arith_inductive_generalizer() override {}
-        virtual void operator()(model_node& n, expr_ref_vector& core, bool& uses_level);
+        void operator()(model_node& n, expr_ref_vector& core, bool& uses_level) override;
     };
 
     class core_farkas_generalizer : public core_generalizer {
         farkas_learner m_farkas_learner;
     public:
         core_farkas_generalizer(context& ctx, ast_manager& m, smt_params& p);
-        virtual ~core_farkas_generalizer() {}
+        ~core_farkas_generalizer() override {}
-        virtual void operator()(model_node& n, expr_ref_vector& core, bool& uses_level);  
+        void operator()(model_node& n, expr_ref_vector& core, bool& uses_level) override;
-        virtual void collect_statistics(statistics& st) const;
+        void collect_statistics(statistics& st) const override;
     };
 
 
@@ -85,26 +85,26 @@ namespace pdr {
         bool is_unsat(expr_ref_vector const& As, expr* B);
     public:
         core_convex_hull_generalizer(context& ctx, bool is_closure);
-        virtual ~core_convex_hull_generalizer() {}
+        ~core_convex_hull_generalizer() override {}
-        virtual void operator()(model_node& n, expr_ref_vector const& core, bool uses_level, cores& new_cores);
+        void operator()(model_node& n, expr_ref_vector const& core, bool uses_level, cores& new_cores) override;
-        virtual void operator()(model_node& n, expr_ref_vector& core, bool& uses_level);
+        void operator()(model_node& n, expr_ref_vector& core, bool& uses_level) override;
     };
 
     class core_multi_generalizer : public core_generalizer {
         core_bool_inductive_generalizer m_gen;
     public:
         core_multi_generalizer(context& ctx, unsigned max_failures): core_generalizer(ctx), m_gen(ctx, max_failures) {}
-        virtual ~core_multi_generalizer() {}
+        ~core_multi_generalizer() override {}
-        virtual void operator()(model_node& n, expr_ref_vector& core, bool& uses_level);
+        void operator()(model_node& n, expr_ref_vector& core, bool& uses_level) override;
-        virtual void operator()(model_node& n, expr_ref_vector const& core, bool uses_level, cores& new_cores);
+        void operator()(model_node& n, expr_ref_vector const& core, bool uses_level, cores& new_cores) override;
     };
 
     class core_induction_generalizer : public core_generalizer {
         class imp;
     public:
         core_induction_generalizer(context& ctx): core_generalizer(ctx) {}
-        virtual ~core_induction_generalizer() {}
+        ~core_induction_generalizer() override {}
-        virtual void operator()(model_node& n, expr_ref_vector& core, bool& uses_level);
+        void operator()(model_node& n, expr_ref_vector& core, bool& uses_level) override;
     };
 };
 #endif

src/muz/pdr/pdr_smt_context_manager.h

@@ -59,15 +59,15 @@ namespace pdr {
         smt::kernel & m_context;
     public:
         _smt_context(smt::kernel & ctx, smt_context_manager& p, app* pred); 
-        virtual ~_smt_context() {}
+        ~_smt_context() override {}
-        virtual void assert_expr(expr* e);
+        void assert_expr(expr* e) override;
-        virtual lbool check(expr_ref_vector& assumptions);
+        lbool check(expr_ref_vector& assumptions) override;
-        virtual void get_model(model_ref& model);
+        void get_model(model_ref& model) override;
-        virtual proof* get_proof();
+        proof* get_proof() override;
-        virtual void push() { m_context.push(); }
+        void push() override { m_context.push(); }
-        virtual void pop() { m_context.pop(1); }
+        void pop() override { m_context.pop(1); }
-        virtual unsigned get_unsat_core_size() { return m_context.get_unsat_core_size(); }
+        unsigned get_unsat_core_size() override { return m_context.get_unsat_core_size(); }
-        virtual expr* get_unsat_core_expr(unsigned i) { return m_context.get_unsat_core_expr(i); }
+        expr* get_unsat_core_expr(unsigned i) override { return m_context.get_unsat_core_expr(i); }
     };
 
     class smt_context_manager {

src/muz/rel/check_relation.cpp

@@ -192,8 +192,8 @@ namespace datalog {
                  const unsigned * cols1, const unsigned * cols2)
             : convenient_join_fn(o1_sig, o2_sig, col_cnt, cols1, cols2), m_join(j) 
         {}
-        virtual ~join_fn() {}
+        ~join_fn() override {}
-        virtual relation_base * operator()(const relation_base & r1, const relation_base & r2) {
+        relation_base * operator()(const relation_base & r1, const relation_base & r2) override {
             check_relation const& t1 = get(r1);
             check_relation const& t2 = get(r2);
             check_relation_plugin& p = t1.get_plugin();
@@ -221,8 +221,8 @@ namespace datalog {
             : convenient_join_project_fn(o1_sig, o2_sig, col_cnt, cols1, cols2,
                                          removed_col_cnt, removed_cols), m_join(j) 
         {}
-        virtual ~join_project_fn() {}
+        ~join_project_fn() override {}
-        virtual relation_base * operator()(const relation_base & r1, const relation_base & r2) {
+        relation_base * operator()(const relation_base & r1, const relation_base & r2) override {
             check_relation const& t1 = get(r1);
             check_relation const& t2 = get(r2);
             check_relation_plugin& p = t1.get_plugin();
@@ -491,7 +491,7 @@ namespace datalog {
     public:
         union_fn(relation_union_fn* m): m_union(m) {}
 
-        virtual void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) {
+        void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) override {
             TRACE("doc", _r.display(tout << "dst:\n"); _src.display(tout  << "src:\n"););
             check_relation& r = get(_r);
             check_relation const& src = get(_src);
@@ -529,9 +529,9 @@ namespace datalog {
               m_filter(f) {
         }
 
-        virtual ~filter_identical_fn() {}
+        ~filter_identical_fn() override {}
         
-        virtual void operator()(relation_base & _r) {
+        void operator()(relation_base & _r) override {
             check_relation& r = get(_r);
             check_relation_plugin& p = r.get_plugin();            
             ast_manager& m = p.m;
@@ -565,9 +565,9 @@ namespace datalog {
             m_condition(condition) {
         }
 
-        virtual ~filter_interpreted_fn() {}
+        ~filter_interpreted_fn() override {}
         
-        virtual void operator()(relation_base & tb) {            
+        void operator()(relation_base & tb) override {
             check_relation& r = get(tb);
             check_relation_plugin& p = r.get_plugin();            
             expr_ref fml = r.m_fml;
@@ -592,9 +592,9 @@ namespace datalog {
               m_project(p) {
         }
 
-        virtual ~project_fn() {}
+        ~project_fn() override {}
 
-        virtual relation_base * operator()(const relation_base & tb) {
+        relation_base * operator()(const relation_base & tb) override {
             check_relation const& t = get(tb);
             check_relation_plugin& p = t.get_plugin();
             relation_base* r = (*m_project)(t.rb());
@@ -620,9 +620,9 @@ namespace datalog {
               m_permute(permute) {
         }
 
-        virtual ~rename_fn() {}
+        ~rename_fn() override {}
 
-        virtual relation_base * operator()(const relation_base & _t) {
+        relation_base * operator()(const relation_base & _t) override {
             check_relation const& t = get(_t);
             check_relation_plugin& p = t.get_plugin();            
             relation_signature const& sig = get_result_signature();
@@ -649,8 +649,8 @@ namespace datalog {
             m_val(val),
             m_col(col)
         {}
-        virtual ~filter_equal_fn() { }        
+        ~filter_equal_fn() override { }
-        virtual void operator()(relation_base & tb) {
+        void operator()(relation_base & tb) override {
             check_relation & t = get(tb);
             check_relation_plugin& p = t.get_plugin();
             (*m_filter)(t.rb());
@@ -682,7 +682,7 @@ namespace datalog {
             SASSERT(joined_col_cnt > 0);
         }
         
-        virtual void operator()(relation_base& tb, const relation_base& negb) {
+        void operator()(relation_base& tb, const relation_base& negb) override {
             check_relation& t = get(tb);
             check_relation const& n = get(negb);
             check_relation_plugin& p = t.get_plugin();
@@ -763,9 +763,9 @@ namespace datalog {
             m_xform(xform)
         {}
         
-        virtual ~filter_proj_fn() {}
+        ~filter_proj_fn() override {}
 
-        virtual relation_base* operator()(const relation_base & tb) {
+        relation_base* operator()(const relation_base & tb) override {
             check_relation const & t = get(tb);
             check_relation_plugin& p = t.get_plugin();
             relation_base* r = (*m_xform)(t.rb());

src/muz/rel/check_relation.h

@@ -38,20 +38,20 @@ namespace datalog {
         expr_ref mk_eq(relation_fact const& f) const;
     public:
         check_relation(check_relation_plugin& p, relation_signature const& s, relation_base* r);
-        virtual ~check_relation();
+        ~check_relation() override;
-        virtual void reset();
+        void reset() override;
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
-        virtual void add_new_fact(const relation_fact & f);
+        void add_new_fact(const relation_fact & f) override;
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
-        virtual check_relation * clone() const;
+        check_relation * clone() const override;
-        virtual check_relation * complement(func_decl*) const;
+        check_relation * complement(func_decl*) const override;
-        virtual void to_formula(expr_ref& fml) const;
+        void to_formula(expr_ref& fml) const override;
         check_relation_plugin& get_plugin() const; 
-        virtual bool fast_empty() const;
+        bool fast_empty() const override;
-        virtual bool empty() const; 
+        bool empty() const override;
-        virtual void display(std::ostream& out) const;
+        void display(std::ostream& out) const override;
-        virtual bool is_precise() const { return m_relation->is_precise(); }
+        bool is_precise() const override { return m_relation->is_precise(); }
-        virtual unsigned get_size_estimate_rows() const { return m_relation->get_size_estimate_rows(); }
+        unsigned get_size_estimate_rows() const override { return m_relation->get_size_estimate_rows(); }
         relation_base&  rb() { return *m_relation; }
         relation_base const& rb() const { return *m_relation; }
         expr_ref ground(expr* fml) const;
@@ -90,39 +90,39 @@ namespace datalog {
             unsigned_vector const& cols1, unsigned_vector const& cols2);
     public:
         check_relation_plugin(relation_manager& rm);
-        ~check_relation_plugin();
+        ~check_relation_plugin() override;
         void set_plugin(relation_plugin* p) { m_base = p; }
 
-        virtual bool can_handle_signature(const relation_signature & s);
+        bool can_handle_signature(const relation_signature & s) override;
         static symbol get_name() { return symbol("check_relation"); }
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s);
+        relation_base * mk_full(func_decl* p, const relation_signature & s) override;
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_join_fn * mk_join_project_fn(
+        relation_join_fn * mk_join_project_fn(
             const relation_base & t1, const relation_base & t2,
             unsigned col_cnt, const unsigned * cols1, const unsigned * cols2,
-            unsigned removed_col_cnt, const unsigned * removed_cols);
+            unsigned removed_col_cnt, const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_negation_fn(
+        relation_intersection_filter_fn * mk_filter_by_negation_fn(
             const relation_base& t,
             const relation_base& neg, unsigned joined_col_cnt, const unsigned *t_cols,
-            const unsigned *negated_cols);
+            const unsigned *negated_cols) override;
-        virtual relation_transformer_fn * mk_filter_interpreted_and_project_fn(
+        relation_transformer_fn * mk_filter_interpreted_and_project_fn(
             const relation_base & t, app * condition,
-            unsigned removed_col_cnt, const unsigned * removed_cols);
+            unsigned removed_col_cnt, const unsigned * removed_cols) override;
 
         void verify_join(relation_base const& t1, relation_base const& t2, relation_base const& t,
                          unsigned_vector const& cols1, unsigned_vector const& cols2);

src/muz/rel/dl_base.cpp

@@ -423,17 +423,17 @@ namespace datalog {
         const row_interface & m_parent;
         unsigned m_index;
     protected:
-        virtual bool is_finished() const { return m_index==m_parent.size(); }
+        bool is_finished() const override { return m_index==m_parent.size(); }
     public:
         fact_row_iterator(const row_interface & row, bool finished) 
             : m_parent(row), m_index(finished ? row.size() : 0) {}
 
-        virtual table_element operator*() {
+        table_element operator*() override {
             SASSERT(!is_finished());
             return m_parent[m_index];
         }
 
-        virtual void operator++() {
+        void operator++() override {
             m_index++;
             SASSERT(m_index<=m_parent.size());
         }

src/muz/rel/dl_base.h

@@ -220,7 +220,7 @@ namespace datalog {
         */
         class mutator_fn : public base_fn {
         public:
-            virtual ~mutator_fn() {}
+            ~mutator_fn() override {}
 
             virtual void operator()(base_object & t) = 0;
 
@@ -629,19 +629,19 @@ namespace datalog {
 
         class identity_transformer_fn : public transformer_fn {
         public:
-            virtual base_object * operator()(const base_object & t) {
+            base_object * operator()(const base_object & t) override {
                 return t.clone();
             }
         };
 
         class identity_mutator_fn : public mutator_fn {
         public:
-            virtual void operator()(base_object & t) {};
+            void operator()(base_object & t) override {};
         };
 
         class identity_intersection_filter_fn : public intersection_filter_fn {
         public:
-            virtual void operator()(base_object & t, const base_object & neg) {};
+            void operator()(base_object & t, const base_object & neg) override {};
         };
 
         class default_permutation_rename_fn : public transformer_fn {
@@ -655,11 +655,11 @@ namespace datalog {
                 : m_permutation(o.get_signature().size(), permutation),
                 m_renamers_initialized(false) {}
 
-            ~default_permutation_rename_fn() {
+            ~default_permutation_rename_fn() override {
                 dealloc_ptr_vector_content(m_renamers);
             }
 
-            base_object * operator()(const base_object & o) {
+            base_object * operator()(const base_object & o) override {
                 const base_object * res = &o;
                 scoped_rel<base_object> res_scoped;
                 if(m_renamers_initialized) {
@@ -803,11 +803,11 @@ namespace datalog {
     protected:
         relation_base(relation_plugin & plugin, const relation_signature & s) 
             : base_ancestor(plugin, s) {}
-        virtual ~relation_base() {}
+        ~relation_base() override {}
     public:
         virtual relation_base * complement(func_decl* p) const = 0;
 
-        virtual void reset();
+        void reset() override;
 
         virtual void display_tuples(func_decl & pred, std::ostream & out) const {
             out << "Tuples in " << pred.get_name() << ": \n";
@@ -1022,7 +1022,7 @@ namespace datalog {
         table_plugin(symbol const& n, relation_manager & manager) : plugin_object(n, manager) {}
     public:
 
-        virtual bool can_handle_signature(const table_signature & s) { return s.functional_columns()==0; }
+        bool can_handle_signature(const table_signature & s) override { return s.functional_columns()==0; }
 
     protected:
         /**
@@ -1044,17 +1044,17 @@ namespace datalog {
     protected:
         table_base(table_plugin & plugin, const table_signature & s) 
             : base_ancestor(plugin, s) {}
-        virtual ~table_base() {}
+        ~table_base() override {}
     public:
-        virtual table_base * clone() const;
+        table_base * clone() const override;
         virtual table_base * complement(func_decl* p, const table_element * func_columns = 0) const;
-        virtual bool empty() const;
+        bool empty() const override;
 
         /**
            \brief Return true if table contains fact that corresponds to \c f in all non-functional
            columns.
          */
-        virtual bool contains_fact(const table_fact & f) const;
+        bool contains_fact(const table_fact & f) const override;
 
         /**
            \brief If \c f (i.e. its non-functional part) is not present in the table, 
@@ -1082,11 +1082,11 @@ namespace datalog {
         virtual void remove_fact(table_element const* fact) = 0;
         virtual void remove_facts(unsigned fact_cnt, const table_fact * facts);
         virtual void remove_facts(unsigned fact_cnt, const table_element * facts);
-        virtual void reset();
+        void reset() override;
 
         class row_interface;
 
-        virtual void display(std::ostream & out) const;
+        void display(std::ostream & out) const override;
 
         /**
            \brief Convert table to a formula that encodes the table.
@@ -1245,9 +1245,9 @@ namespace datalog {
         public:
             caching_row_interface(const table_base & parent) : row_interface(parent) {}
 
-            virtual void get_fact(table_fact & result) const = 0;
+            void get_fact(table_fact & result) const override = 0;
 
-            virtual table_element operator[](unsigned col) const { 
+            table_element operator[](unsigned col) const override {
                 ensure_populated();
                 return m_current[col];
             }

src/muz/rel/dl_bound_relation.cpp

@@ -79,7 +79,7 @@ namespace datalog {
             : convenient_relation_join_fn(o1_sig, o2_sig, col_cnt, cols1, cols2) {
         }
 
-        virtual relation_base * operator()(const relation_base & _r1, const relation_base & _r2) {
+        relation_base * operator()(const relation_base & _r1, const relation_base & _r2) override {
             bound_relation const& r1 = get(_r1);
             bound_relation const& r2 = get(_r2);
             bound_relation_plugin& p = r1.get_plugin();
@@ -104,7 +104,7 @@ namespace datalog {
             : convenient_relation_project_fn(orig_sig, removed_col_cnt, removed_cols) {
         }
 
-        virtual relation_base * operator()(const relation_base & _r) {
+        relation_base * operator()(const relation_base & _r) override {
             bound_relation const& r = get(_r);
             bound_relation_plugin& p = r.get_plugin();
             bound_relation* result = get(p.mk_full(0, get_result_signature()));            
@@ -124,7 +124,7 @@ namespace datalog {
             : convenient_relation_rename_fn(orig_sig, cycle_len, cycle) {
         }
 
-        virtual relation_base * operator()(const relation_base & _r) {
+        relation_base * operator()(const relation_base & _r) override {
             bound_relation const& r = get(_r);
             bound_relation_plugin& p = r.get_plugin();
             bound_relation* result = get(p.mk_full(0, get_result_signature()));
@@ -148,7 +148,7 @@ namespace datalog {
         union_fn(bool is_widen) :
             m_is_widen(is_widen) {            
         }
-        virtual void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) {
+        void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) override {
             TRACE("bound_relation", _r.display(tout << "dst:\n"); _src.display(tout  << "src:\n"););
             get(_r).mk_union(get(_src), get(_delta), m_is_widen);
         }
@@ -160,7 +160,7 @@ namespace datalog {
         union_fn_i(bool is_widen) :
             m_is_widen(is_widen) {            
         }
-        virtual void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) {
+        void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) override {
             TRACE("bound_relation", _r.display(tout << "dst:\n"); _src.display(tout  << "src:\n"););   
             get(_r).mk_union_i(get_interval_relation(_src), get(_delta), m_is_widen);
             TRACE("bound_relation", _r.display(tout << "dst':\n"););
@@ -197,7 +197,7 @@ namespace datalog {
         filter_identical_fn(unsigned col_cnt, const unsigned * identical_cols) 
             : m_cols(col_cnt, identical_cols) {}
 
-        virtual void operator()(relation_base & r) {
+        void operator()(relation_base & r) override {
             for (unsigned i = 1; i < m_cols.size(); ++i) {
                 get(r).equate(m_cols[0], m_cols[i]);
             }
@@ -216,7 +216,7 @@ namespace datalog {
     public:
         filter_equal_fn(relation_element const& value, unsigned col) {}
 
-        virtual void operator()(relation_base & r) { }
+        void operator()(relation_base & r) override { }
     };
 
     relation_mutator_fn * bound_relation_plugin::mk_filter_equal_fn(const relation_base & r, 
@@ -342,7 +342,7 @@ namespace datalog {
         // x < y + z
         //  
 
-        void operator()(relation_base& t) {
+        void operator()(relation_base& t) override {
             TRACE("dl", tout << mk_pp(m_cond, m_cond.get_manager()) << "\n"; t.display(tout););
             bound_relation& r = get(t);
             switch(m_kind) {
@@ -370,11 +370,11 @@ namespace datalog {
             TRACE("dl", t.display(tout << "result\n"););   
         }
 
-        bool supports_attachment(relation_base& t) {
+        bool supports_attachment(relation_base& t) override {
             return is_interval_relation(t);
         }
 
-        void attach(relation_base& t) {
+        void attach(relation_base& t) override {
             SASSERT(is_interval_relation(t));
             interval_relation& r = get_interval_relation(t);
             m_interval = &r;

src/muz/rel/dl_bound_relation.h

@@ -47,29 +47,29 @@ namespace datalog {
         bool_rewriter m_bsimp;
     public:
         bound_relation_plugin(relation_manager& m);
-        virtual bool can_handle_signature(const relation_signature & s);
+        bool can_handle_signature(const relation_signature & s) override;
         static symbol get_name() { return symbol("bound_relation"); }
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s);
+        relation_base * mk_full(func_decl* p, const relation_signature & s) override;
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
 
-        virtual relation_join_fn * mk_join_project_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_project_fn(const relation_base & t1, const relation_base & t2,
                     unsigned joined_col_cnt, const unsigned * cols1, const unsigned * cols2,
-                    unsigned removed_col_cnt, const unsigned * removed_cols) { return 0; }
+                    unsigned removed_col_cnt, const unsigned * removed_cols) override { return 0; }
 
 
 #if 0
@@ -123,12 +123,12 @@ namespace datalog {
         bound_relation(bound_relation_plugin& p, relation_signature const& s, bool is_empty);
         bound_relation& operator=(bound_relation const& other);
 
-        virtual bool empty() const { return m_empty; }
+        bool empty() const override { return m_empty; }
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
-        virtual bound_relation * clone() const;
+        bound_relation * clone() const override;
-        virtual bound_relation * complement(func_decl* p) const;
+        bound_relation * complement(func_decl* p) const override;
-        virtual void to_formula(expr_ref& fml) const;
+        void to_formula(expr_ref& fml) const override;
         bound_relation_plugin& get_plugin() const; 
 
         void mk_union_i(interval_relation const& src, bound_relation* delta, bool is_widen);
@@ -141,28 +141,28 @@ namespace datalog {
 
         bool is_lt(unsigned i, unsigned j) const;
 
-        virtual bool is_precise() const { return false; }
+        bool is_precise() const override { return false; }
 
     private:
         typedef uint_set2 T;
-        virtual T mk_intersect(T const& t1, T const& t2, bool& is_empty) const;
+        T mk_intersect(T const& t1, T const& t2, bool& is_empty) const override;
 
-        virtual T mk_widen(T const& t1, T const& t2) const;
+        T mk_widen(T const& t1, T const& t2) const override;
 
-        virtual T mk_unite(T const& t1, T const& t2) const;
+        T mk_unite(T const& t1, T const& t2) const override;
 
-        virtual T mk_eq(union_find<> const& old_eqs, union_find<> const& new_eqs, T const& t) const;
+        T mk_eq(union_find<> const& old_eqs, union_find<> const& new_eqs, T const& t) const override;
 
-        virtual void mk_rename_elem(T& i, unsigned col_cnt, unsigned const* cycle);
+        void mk_rename_elem(T& i, unsigned col_cnt, unsigned const* cycle) override;
 
 
-        virtual bool is_subset_of(T const& t1, T const& t2) const;
+        bool is_subset_of(T const& t1, T const& t2) const override;
 
-        virtual bool is_full(T const& t) const;
+        bool is_full(T const& t) const override;
 
-        virtual bool is_empty(unsigned idx, T const& t) const;
+        bool is_empty(unsigned idx, T const& t) const override;
 
-        virtual void display_index(unsigned idx, T const& t, std::ostream& out) const;
+        void display_index(unsigned idx, T const& t, std::ostream& out) const override;
 
         void normalize(T const& src, T& dst) const;
 

src/muz/rel/dl_check_table.cpp

@@ -65,7 +65,7 @@ namespace datalog {
             m_checker = p.get_manager().mk_join_fn(checker(t1), checker(t2), col_cnt, cols1, cols2);
         }
 
-        virtual table_base* operator()(const table_base & t1, const table_base & t2) {
+        table_base* operator()(const table_base & t1, const table_base & t2) override {
             IF_VERBOSE(1, verbose_stream() << __FUNCTION__ << "\n";);
             table_base* ttocheck = (*m_tocheck)(tocheck(t1), tocheck(t2));
             table_base* tchecker = (*m_checker)(checker(t1), checker(t2));
@@ -93,7 +93,7 @@ namespace datalog {
             m_checker = p.get_manager().mk_join_project_fn(checker(t1), checker(t2), col_cnt, cols1, cols2, removed_col_cnt, removed_cols);
         }
 
-        virtual table_base* operator()(const table_base & t1, const table_base & t2) {
+        table_base* operator()(const table_base & t1, const table_base & t2) override {
             table_base* ttocheck = (*m_tocheck)(tocheck(t1), tocheck(t2));
             table_base* tchecker = (*m_checker)(checker(t1), checker(t2));
             check_table* result = alloc(check_table, get(t1).get_plugin(), ttocheck->get_signature(), ttocheck, tchecker);
@@ -119,7 +119,7 @@ namespace datalog {
             m_checker = p.get_manager().mk_union_fn(checker(tgt), checker(src), checker(delta));
         }
         
-        virtual void operator()(table_base& tgt, const table_base& src, table_base* delta) {
+        void operator()(table_base& tgt, const table_base& src, table_base* delta) override {
             IF_VERBOSE(1, verbose_stream() << __FUNCTION__ << "\n";);
             (*m_tocheck)(tocheck(tgt), tocheck(src), tocheck(delta));
             (*m_checker)(checker(tgt), checker(src), checker(delta));
@@ -147,7 +147,7 @@ namespace datalog {
             m_tocheck = p.get_manager().mk_project_fn(tocheck(t), col_cnt, removed_cols);
         }
 
-        table_base* operator()(table_base const& src) {
+        table_base* operator()(table_base const& src) override {
             table_base* tchecker = (*m_checker)(checker(src));
             table_base* ttocheck = (*m_tocheck)(tocheck(src));
             check_table* result = alloc(check_table, get(src).get_plugin(), tchecker->get_signature(), ttocheck, tchecker);
@@ -171,7 +171,7 @@ namespace datalog {
             m_tocheck = p.get_manager().mk_select_equal_and_project_fn(tocheck(t), value, col);
         }
 
-        table_base* operator()(table_base const& src) {
+        table_base* operator()(table_base const& src) override {
             table_base* tchecker = (*m_checker)(checker(src));
             table_base* ttocheck = (*m_tocheck)(tocheck(src));
             check_table* result = alloc(check_table, get(src).get_plugin(), tchecker->get_signature(), ttocheck, tchecker);
@@ -196,7 +196,7 @@ namespace datalog {
             m_tocheck = p.get_manager().mk_rename_fn(tocheck(t), cycle_len, cycle);
         }
 
-        table_base* operator()(table_base const& src) {
+        table_base* operator()(table_base const& src) override {
             IF_VERBOSE(1, verbose_stream() << __FUNCTION__ << "\n";);
             table_base* tchecker = (*m_checker)(checker(src));
             table_base* ttocheck = (*m_tocheck)(tocheck(src));
@@ -222,7 +222,7 @@ namespace datalog {
             m_tocheck = p.get_manager().mk_filter_identical_fn(tocheck(t), cnt, cols);        
         }
 
-        void operator()(table_base & t) {
+        void operator()(table_base & t) override {
             (*m_checker)(checker(t));
             (*m_tocheck)(tocheck(t));
             get(t).well_formed();
@@ -247,7 +247,7 @@ namespace datalog {
             m_tocheck = p.get_manager().mk_filter_equal_fn(tocheck(t), v, col); 
         }
 
-        virtual void operator()(table_base& src) {
+        void operator()(table_base& src) override {
             (*m_checker)(checker(src));
             (*m_tocheck)(tocheck(src));
             get(src).well_formed();
@@ -271,7 +271,7 @@ namespace datalog {
             m_tocheck = p.get_manager().mk_filter_interpreted_fn(tocheck(t), condition); 
         }
 
-        virtual void operator()(table_base& src) {
+        void operator()(table_base& src) override {
             (*m_checker)(checker(src));
             (*m_tocheck)(tocheck(src));
             get(src).well_formed();
@@ -296,7 +296,7 @@ namespace datalog {
             m_tocheck = p.get_manager().mk_filter_interpreted_and_project_fn(tocheck(t), condition, removed_col_cnt, removed_cols); 
         }
 
-        table_base* operator()(table_base const& src) {
+        table_base* operator()(table_base const& src) override {
             table_base* tchecker = (*m_checker)(checker(src));
             table_base* ttocheck = (*m_tocheck)(tocheck(src));
             check_table* result = alloc(check_table, get(src).get_plugin(), ttocheck->get_signature(), ttocheck, tchecker);
@@ -325,7 +325,7 @@ namespace datalog {
             m_tocheck = p.get_manager().mk_filter_by_negation_fn(tocheck(t), tocheck(negated_obj), joined_col_cnt, t_cols, negated_cols);
         }
 
-        virtual void operator()(table_base& src, table_base const& negated_obj) {
+        void operator()(table_base& src, table_base const& negated_obj) override {
             IF_VERBOSE(1, verbose_stream() << __FUNCTION__ << "\n";);
             (*m_checker)(checker(src), checker(negated_obj));
             (*m_tocheck)(tocheck(src), tocheck(negated_obj));

src/muz/rel/dl_check_table.h

@@ -53,34 +53,34 @@ namespace datalog {
             m_checker(*manager.get_table_plugin(checker)),
             m_tocheck(*manager.get_table_plugin(tocheck)), m_count(0) {}
 
-        virtual table_base * mk_empty(const table_signature & s);
+        table_base * mk_empty(const table_signature & s) override;
 
-        virtual table_join_fn * mk_join_fn(const table_base & t1, const table_base & t2,
+        table_join_fn * mk_join_fn(const table_base & t1, const table_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual table_join_fn * mk_join_project_fn(const table_base & t1, const table_base & t2,
+        table_join_fn * mk_join_project_fn(const table_base & t1, const table_base & t2,
             unsigned col_cnt, const unsigned * cols1, const unsigned * cols2, unsigned removed_col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual table_union_fn * mk_union_fn(const table_base & tgt, const table_base & src, 
+        table_union_fn * mk_union_fn(const table_base & tgt, const table_base & src,
-            const table_base * delta);
+            const table_base * delta) override;
-        virtual table_transformer_fn * mk_project_fn(const table_base & t, unsigned col_cnt, 
+        table_transformer_fn * mk_project_fn(const table_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual table_transformer_fn * mk_select_equal_and_project_fn(const table_base & t, 
+        table_transformer_fn * mk_select_equal_and_project_fn(const table_base & t,
-            const table_element & value, unsigned col);
+            const table_element & value, unsigned col) override;
-        virtual table_transformer_fn * mk_rename_fn(const table_base & t, unsigned permutation_cycle_len,
+        table_transformer_fn * mk_rename_fn(const table_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual table_mutator_fn * mk_filter_identical_fn(const table_base & t, unsigned col_cnt, 
+        table_mutator_fn * mk_filter_identical_fn(const table_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual table_mutator_fn * mk_filter_equal_fn(const table_base & t, const table_element & value, 
+        table_mutator_fn * mk_filter_equal_fn(const table_base & t, const table_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual table_mutator_fn * mk_filter_interpreted_fn(const table_base & t, app * condition);
+        table_mutator_fn * mk_filter_interpreted_fn(const table_base & t, app * condition) override;
-        virtual table_transformer_fn * mk_filter_interpreted_and_project_fn(const table_base & t,
+        table_transformer_fn * mk_filter_interpreted_and_project_fn(const table_base & t,
-            app * condition, unsigned removed_col_cnt, const unsigned * removed_cols);
+            app * condition, unsigned removed_col_cnt, const unsigned * removed_cols) override;
-        virtual table_intersection_filter_fn * mk_filter_by_negation_fn(
+        table_intersection_filter_fn * mk_filter_by_negation_fn(
             const table_base & t,
             const table_base & negated_obj, unsigned joined_col_cnt,
-            const unsigned * t_cols, const unsigned * negated_cols);
+            const unsigned * t_cols, const unsigned * negated_cols) override;
 
-        virtual bool can_handle_signature(table_signature const& s);
+        bool can_handle_signature(table_signature const& s) override;
 
     private:
         static check_table& get(table_base& r);
@@ -106,7 +106,7 @@ namespace datalog {
         check_table(check_table_plugin & p, const table_signature & sig);
         check_table(check_table_plugin & p, const table_signature & sig, table_base* tocheck, table_base* checker);
 
-        virtual ~check_table();
+        ~check_table() override;
 
         bool well_formed() const;
 
@@ -116,18 +116,18 @@ namespace datalog {
             return static_cast<check_table_plugin &>(table_base::get_plugin()); 
         }
 
-        virtual bool empty() const;
+        bool empty() const override;
-        virtual void add_fact(const table_fact & f);
+        void add_fact(const table_fact & f) override;
-        virtual void remove_fact(const table_element*  fact);
+        void remove_fact(const table_element*  fact) override;
-        virtual bool contains_fact(const table_fact & f) const;       
+        bool contains_fact(const table_fact & f) const override;
-        virtual table_base * complement(func_decl* p, const table_element * func_columns = 0) const;
+        table_base * complement(func_decl* p, const table_element * func_columns = 0) const override;
-        virtual table_base * clone() const;
+        table_base * clone() const override;
 
-        virtual iterator begin() const { SASSERT(well_formed()); return m_tocheck->begin(); }
+        iterator begin() const override { SASSERT(well_formed()); return m_tocheck->begin(); }
-        virtual iterator end() const { return m_tocheck->end(); }
+        iterator end() const override { return m_tocheck->end(); }
 
-        virtual unsigned get_size_estimate_rows() const { return m_tocheck->get_size_estimate_rows(); }
+        unsigned get_size_estimate_rows() const override { return m_tocheck->get_size_estimate_rows(); }
-        virtual unsigned get_size_estimate_bytes() const { return m_tocheck->get_size_estimate_bytes(); }
+        unsigned get_size_estimate_bytes() const override { return m_tocheck->get_size_estimate_bytes(); }
     };
 
  };

src/muz/rel/dl_compiler.h

@@ -97,7 +97,7 @@ namespace datalog {
 
             void start_rule(rule * r) { SASSERT(!m_current); m_current=r; }
             void finish_rule() { m_current = 0; }
-            virtual void notify(instruction * i) {
+            void notify(instruction * i) override {
                 if(m_current) {
                     i->set_accounting_parent_object(m_parent.m_context, m_current);
                 }

src/muz/rel/dl_external_relation.cpp

@@ -195,7 +195,7 @@ namespace datalog {
             m_join_fn = m.mk_func_decl(fid, OP_RA_JOIN, params.size(), params.c_ptr(), 2, domain);
         }
 
-        virtual relation_base * operator()(const relation_base & r1, const relation_base & r2) {
+        relation_base * operator()(const relation_base & r1, const relation_base & r2) override {
             expr_ref res(m_plugin.get_ast_manager());
             m_args[0] = get(r1).get_relation();
             m_args[1] = get(r2).get_relation();
@@ -231,7 +231,7 @@ namespace datalog {
             m_project_fn = m.mk_func_decl(fid, OP_RA_PROJECT, params.size(), params.c_ptr(), 1, &relation_sort);
         }
 
-        virtual relation_base * operator()(const relation_base & r) {
+        relation_base * operator()(const relation_base & r) override {
             expr_ref res(m_plugin.get_ast_manager());
             expr* rel = get(r).get_relation();
             m_plugin.reduce(m_project_fn, 1, &rel, res); 
@@ -265,7 +265,7 @@ namespace datalog {
             m_rename_fn = m.mk_func_decl(fid, OP_RA_RENAME, params.size(), params.c_ptr(), 1, &relation_sort);
         }
 
-        virtual relation_base * operator()(const relation_base & r) {
+        relation_base * operator()(const relation_base & r) override {
             expr* rel = get(r).get_relation();
             expr_ref res(m_plugin.get_ast_manager());
             m_args[0] = rel;
@@ -298,7 +298,7 @@ namespace datalog {
             m_union_fn = m.mk_func_decl(p.get_family_id(), k, 0, 0, 2, domain);
         }
 
-        virtual void operator()(relation_base & r, const relation_base & src, relation_base * delta) {
+        void operator()(relation_base & r, const relation_base & src, relation_base * delta) override {
             ast_manager& m = m_plugin.get_ast_manager();
             expr_ref_vector res(m);
             m_args[0] = get(r).get_relation();
@@ -342,7 +342,7 @@ namespace datalog {
             SASSERT(p.get_ast_manager().is_bool(condition));
         }
 
-        virtual void operator()(relation_base & r) {
+        void operator()(relation_base & r) override {
             SASSERT(m_plugin.check_kind(r));
             expr* arg = get(r).get_relation();
             m_plugin.reduce_assign(m_filter_fn, 1, &arg, 1, &arg);
@@ -396,7 +396,7 @@ namespace datalog {
             }
         }
 
-        virtual void operator()(relation_base & r) {
+        void operator()(relation_base & r) override {
             expr* r0 = get(r).get_relation();
             for (unsigned i = 0; i < m_filter_fn.size(); ++i) {
                 m_plugin.reduce_assign(m_filter_fn[i].get(), 1, &r0, 1, &r0);                  
@@ -436,7 +436,7 @@ namespace datalog {
             m_negated_filter_fn = m.mk_func_decl(fid, OP_RA_NEGATION_FILTER, params.size(), params.c_ptr(), 2, domain);            
         }
 
-        void operator()(relation_base & t, const relation_base & negated_obj) {
+        void operator()(relation_base & t, const relation_base & negated_obj) override {
             m_args[0] = get(t).get_relation();
             m_args[1] = get(negated_obj).get_relation();
             m_plugin.reduce_assign(m_negated_filter_fn.get(), 2, m_args, 1, m_args);                       

src/muz/rel/dl_external_relation.h

@@ -54,30 +54,30 @@ namespace datalog {
     public:
         external_relation_plugin(external_relation_context& ctx, relation_manager & m);
 
-        virtual bool can_handle_signature(const relation_signature & s) { return true; }
+        bool can_handle_signature(const relation_signature & s) override { return true; }
 
         static symbol get_name() { return symbol("external_relation"); }
 
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
 
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t, 
+        relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t,
             const relation_base & negated_obj, unsigned joined_col_cnt,
-            const unsigned * t_cols, const unsigned * negated_cols);
+            const unsigned * t_cols, const unsigned * negated_cols) override;
 
     private:
 
@@ -123,28 +123,28 @@ namespace datalog {
         void mk_accessor(decl_kind k, func_decl_ref& fn, const relation_fact& f, bool destructive, expr_ref& res) const;
 
         external_relation(external_relation_plugin & p, const relation_signature & s, expr* r);
-        virtual ~external_relation();
+        ~external_relation() override;
 
     public:
         external_relation_plugin & get_plugin() const;
 
-        virtual bool empty() const;
+        bool empty() const override;
 
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
 
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
 
-        virtual external_relation * clone() const;
+        external_relation * clone() const override;
 
-        virtual external_relation * complement(func_decl*) const;
+        external_relation * complement(func_decl*) const override;
 
-        virtual void display(std::ostream & out) const;
+        void display(std::ostream & out) const override;
 
-        virtual void display_tuples(func_decl & pred, std::ostream & out) const;
+        void display_tuples(func_decl & pred, std::ostream & out) const override;
 
         expr*  get_relation() const { return m_rel.get(); }
 
-        virtual void to_formula(expr_ref& fml) const { fml = get_relation(); }
+        void to_formula(expr_ref& fml) const override { fml = get_relation(); }
     
     };
 

src/muz/rel/dl_finite_product_relation.cpp

@@ -333,7 +333,7 @@ namespace datalog {
             : convenient_relation_join_fn(sig1, sig2, col_cnt, cols1, cols2),
             m_plugin(plugin) {}
 
-        virtual relation_base * operator()(const relation_base & r1, const relation_base & r2) {
+        relation_base * operator()(const relation_base & r1, const relation_base & r2) override {
             scoped_rel<finite_product_relation> r1_conv;
             if(&r1.get_plugin()!=&m_plugin) {
                 r1_conv = convert(r1);
@@ -390,7 +390,7 @@ namespace datalog {
                     relation_vector & rjoins)
                 : m_parent(parent), m_r1(r1), m_r2(r2), m_rjoins(rjoins) {}
 
-            virtual bool operator()(table_element * func_columns) {
+            bool operator()(table_element * func_columns) override {
                 const relation_base & or1 = m_r1.get_inner_rel(func_columns[0]);
                 const relation_base & or2 = m_r2.get_inner_rel(func_columns[1]);
                 SASSERT(&or1);
@@ -450,7 +450,7 @@ namespace datalog {
             return (*m_rjoin_fn)(r1, r2);
         }
 
-        virtual relation_base * operator()(const relation_base & rb1, const relation_base & rb2) {
+        relation_base * operator()(const relation_base & rb1, const relation_base & rb2) override {
             finite_product_relation_plugin & plugin = get(rb1).get_plugin();
             relation_manager & rmgr = plugin.get_manager();
 
@@ -565,7 +565,7 @@ namespace datalog {
             project_reducer(project_fn & parent, relation_vector & relations) 
                 : m_parent(parent), m_relations(relations) {}
 
-            virtual void operator()(table_element * func_columns, const table_element * merged_func_columns) {
+            void operator()(table_element * func_columns, const table_element * merged_func_columns) override {
                 relation_base * tgt = m_relations[static_cast<unsigned>(func_columns[0])]->clone();
                 relation_base & src = *m_relations[static_cast<unsigned>(merged_func_columns[0])];
                 if(!m_parent.m_inner_rel_union) {
@@ -579,7 +579,7 @@ namespace datalog {
             }
         };
 
-        virtual relation_base * operator()(const relation_base & rb) {
+        relation_base * operator()(const relation_base & rb) override {
             const finite_product_relation & r = get(rb);
             finite_product_relation_plugin & plugin = r.get_plugin();
             const table_base & rtable = r.get_table();
@@ -696,7 +696,7 @@ namespace datalog {
 
         }
 
-        virtual relation_base * operator()(const relation_base & rb) {
+        relation_base * operator()(const relation_base & rb) override {
             const finite_product_relation & r = get(rb);
             const table_base & rtable = r.get_table();
 
@@ -795,9 +795,9 @@ namespace datalog {
                 m_delta_indexes(delta_indexes), 
                 m_delta_rels(delta_rels) {}
 
-            virtual ~union_mapper() {}
+            ~union_mapper() override {}
 
-            virtual bool operator()(table_element * func_columns) {
+            bool operator()(table_element * func_columns) override {
                 relation_base & otgt_orig = m_tgt.get_inner_rel(func_columns[0]);
                 const relation_base & osrc = m_src.get_inner_rel(func_columns[1]);
 
@@ -838,7 +838,7 @@ namespace datalog {
             src_copying_mapper(finite_product_relation & tgt, const finite_product_relation & src) 
                 : m_tgt(tgt), m_src(src) {}
 
-            virtual bool operator()(table_element * func_columns) {
+            bool operator()(table_element * func_columns) override {
                 const relation_base & osrc = m_src.get_inner_rel(func_columns[0]);
                 unsigned new_tgt_idx = m_tgt.get_next_rel_idx();
                 m_tgt.set_inner_rel(new_tgt_idx, osrc.clone());
@@ -847,7 +847,7 @@ namespace datalog {
             }
         };
 
-        virtual void operator()(relation_base & tgtb, const relation_base & srcb, relation_base * deltab) {
+        void operator()(relation_base & tgtb, const relation_base & srcb, relation_base * deltab) override {
             finite_product_relation & tgt = get(tgtb);
             const finite_product_relation & src0 = get(srcb);
             finite_product_relation * delta = get(deltab);
@@ -1088,7 +1088,7 @@ namespace datalog {
     class finite_product_relation_plugin::converting_union_fn : public relation_union_fn {
         scoped_ptr<relation_union_fn> m_tr_union_fun;
     public:
-        virtual void operator()(relation_base & tgtb, const relation_base & srcb, relation_base * deltab) {
+        void operator()(relation_base & tgtb, const relation_base & srcb, relation_base * deltab) override {
             SASSERT(srcb.get_plugin().is_finite_product_relation());
             const finite_product_relation & src = get(srcb);
             finite_product_relation_plugin & plugin = src.get_plugin();
@@ -1164,7 +1164,7 @@ namespace datalog {
             SASSERT(m_rel_filter);
         }
 
-        virtual void operator()(relation_base & rb) {
+        void operator()(relation_base & rb) override {
             finite_product_relation & r = get(rb);
 
             if(m_table_cols.size()>1) {
@@ -1212,7 +1212,7 @@ namespace datalog {
             }
         }
 
-        virtual void operator()(relation_base & rb) {
+        void operator()(relation_base & rb) override {
             finite_product_relation & r = get(rb);
 
             if(m_table_filter) {
@@ -1339,7 +1339,7 @@ namespace datalog {
             }
         }
 
-        virtual void operator()(relation_base & rb) {
+        void operator()(relation_base & rb) override {
             finite_product_relation & r = get(rb);
             table_base & rtable = r.get_table();
             table_plugin & tplugin = r.get_table_plugin();
@@ -1537,7 +1537,7 @@ namespace datalog {
                         const finite_product_relation & inters)
                 : m_parent(parent), m_r(r), m_inters(inters) {}
 
-            virtual bool operator()(table_element * func_columns) {
+            bool operator()(table_element * func_columns) override {
                 relation_base * r_inner = m_r.get_inner_rel(func_columns[0]).clone();
                 const relation_base & inters_inner = m_inters.get_inner_rel(func_columns[1]);
 
@@ -1557,7 +1557,7 @@ namespace datalog {
         };
 
 
-        virtual void operator()(relation_base & rb, const relation_base & negb) {
+        void operator()(relation_base & rb, const relation_base & negb) override {
             finite_product_relation & r = get(rb);
             const finite_product_relation & neg = get(negb);
 
@@ -1662,7 +1662,7 @@ namespace datalog {
             }
         }
 
-        virtual void operator()(relation_base & rb) {
+        void operator()(relation_base & rb) override {
             finite_product_relation & r = get(rb);
             finite_product_relation_plugin & plugin = r.get_plugin();
             table_plugin & tplugin = r.get_table_plugin();
@@ -2043,7 +2043,7 @@ namespace datalog {
     public:
         live_rel_collection_reducer(idx_set & accumulator) : m_accumulator(accumulator) {}
 
-        virtual void operator()(table_element * func_columns, const table_element * merged_func_columns) {
+        void operator()(table_element * func_columns, const table_element * merged_func_columns) override {
             m_accumulator.insert(static_cast<unsigned>(merged_func_columns[0]));
         }
     };

src/muz/rel/dl_finite_product_relation.h

@@ -93,23 +93,23 @@ namespace datalog {
 
         finite_product_relation_plugin(relation_plugin & inner_plugin, relation_manager & manager);
 
-        virtual void initialize(family_id fid);
+        void initialize(family_id fid) override;
 
         relation_plugin & get_inner_plugin() const { return m_inner_plugin; }
 
-        virtual bool can_handle_signature(const relation_signature & s);
+        bool can_handle_signature(const relation_signature & s) override;
 
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
         /**
            \c inner_kind==null_family_id means we don't care about the kind of the inner relation
         */
         finite_product_relation * mk_empty(const relation_signature & s, const bool * table_columns,
             family_id inner_kind=null_family_id);
         finite_product_relation * mk_empty(const finite_product_relation & original);
-        virtual relation_base * mk_empty(const relation_base & original);
+        relation_base * mk_empty(const relation_base & original) override;
-        virtual relation_base * mk_empty(const relation_signature & s, family_id kind);
+        relation_base * mk_empty(const relation_signature & s, family_id kind) override;
 
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s);
+        relation_base * mk_full(func_decl* p, const relation_signature & s) override;
 
         /**
            \brief Return true if \c r can be converted to \c finite_product_relation_plugin either
@@ -127,22 +127,22 @@ namespace datalog {
         table_relation * to_table_relation(const finite_product_relation & r);
 
     protected:
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t, 
+        relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t,
             const relation_base & negated_obj, unsigned joined_col_cnt,
-            const unsigned * t_cols, const unsigned * negated_cols);
+            const unsigned * t_cols, const unsigned * negated_cols) override;
 
     private:
         /**
@@ -309,7 +309,7 @@ namespace datalog {
 
         bool try_modify_specification(const bool * table_cols);
 
-        virtual bool can_swap(const relation_base & r) const
+        bool can_swap(const relation_base & r) const override
         { return &get_plugin()==&r.get_plugin(); }
 
         /**
@@ -317,7 +317,7 @@ namespace datalog {
 
            Both relations must come from the same plugin and be of the same signature.
         */
-        virtual void swap(relation_base & r);
+        void swap(relation_base & r) override;
 
         /**
            \brief Create a \c finite_product_relation object.
@@ -325,7 +325,7 @@ namespace datalog {
         finite_product_relation(finite_product_relation_plugin & p, const relation_signature & s,
             const bool * table_columns, table_plugin & tplugin, relation_plugin & oplugin, family_id other_kind);
         finite_product_relation(const finite_product_relation & r);
-        virtual ~finite_product_relation();
+        ~finite_product_relation() override;
     public:
         context & get_context() const;
         finite_product_relation_plugin & get_plugin() const { 
@@ -342,22 +342,22 @@ namespace datalog {
         /**
            The function calls garbage_collect, so the internal state may change when it is called.
         */
-        virtual bool empty() const;
+        bool empty() const override;
-        void reset() { m_table->reset(); garbage_collect(false); }
+        void reset() override { m_table->reset(); garbage_collect(false); }
 
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
 
-        virtual finite_product_relation * clone() const;
+        finite_product_relation * clone() const override;
-        virtual finite_product_relation * complement(func_decl* p) const;
+        finite_product_relation * complement(func_decl* p) const override;
 
-        virtual void display(std::ostream & out) const;
+        void display(std::ostream & out) const override;
-        virtual void display_tuples(func_decl & pred, std::ostream & out) const;
+        void display_tuples(func_decl & pred, std::ostream & out) const override;
 
-        virtual unsigned get_size_estimate_rows() const { return m_table->get_size_estimate_rows(); }
+        unsigned get_size_estimate_rows() const override { return m_table->get_size_estimate_rows(); }
-        virtual unsigned get_size_estimate_bytes() const { return m_table->get_size_estimate_bytes(); }
+        unsigned get_size_estimate_bytes() const override { return m_table->get_size_estimate_bytes(); }
 
-        virtual void to_formula(expr_ref& fml) const;
+        void to_formula(expr_ref& fml) const override;
     };
 
 };

src/muz/rel/dl_instruction.cpp

@@ -192,7 +192,7 @@ namespace datalog {
     public:
         instr_io(bool store, func_decl_ref const& pred, reg_idx reg)
             : m_store(store), m_pred(pred), m_reg(reg) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             if (m_store) {
                 if (ctx.reg(m_reg)) {
@@ -218,10 +218,10 @@ namespace datalog {
             }
             return true;
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             ctx.set_register_annotation(m_reg, m_pred->get_name().bare_str());
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             const char * rel_name = m_pred->get_name().bare_str();
             if (m_store) {
                 out << "store " << m_reg << " into " << rel_name;
@@ -245,14 +245,14 @@ namespace datalog {
         reg_idx m_reg;
     public:
         instr_dealloc(reg_idx reg) : m_reg(reg) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             ctx.make_empty(m_reg);
             return true;
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             ctx.set_register_annotation(m_reg, "alloc");
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "dealloc " << m_reg;
         }
     };
@@ -268,7 +268,7 @@ namespace datalog {
     public:
         instr_clone_move(bool clone, reg_idx src, reg_idx tgt)
             : m_clone(clone), m_src(src), m_tgt(tgt) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             if (ctx.reg(m_src)) log_verbose(ctx);            
             if (m_clone) {
                 ctx.set_reg(m_tgt, ctx.reg(m_src) ? ctx.reg(m_src)->clone() : 0);
@@ -278,7 +278,7 @@ namespace datalog {
             }
             return true;
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::string str;
             if (ctx.get_register_annotation(m_src, str)) {
                 ctx.set_register_annotation(m_tgt, str);
@@ -287,7 +287,7 @@ namespace datalog {
                 ctx.set_register_annotation(m_src, str);
             }
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << (m_clone ? "clone " : "move ") << m_src << " into " << m_tgt;
         }
     };
@@ -317,17 +317,17 @@ namespace datalog {
             return true;
         }
     protected:
-        virtual void process_all_costs() {
+        void process_all_costs() override {
             instruction::process_all_costs();
             m_body->process_all_costs();
         }
     public:
         instr_while_loop(unsigned control_reg_cnt, const reg_idx * control_regs, instruction_block * body)
             : m_controls(control_reg_cnt, control_regs), m_body(body) {}
-        virtual ~instr_while_loop() {
+        ~instr_while_loop() override {
             dealloc(m_body);
         }
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             TRACE("dl", tout << "loop entered\n";);
             unsigned count = 0;
@@ -341,14 +341,14 @@ namespace datalog {
             TRACE("dl", tout << "while loop exited\n";);
             return true;
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             m_body->make_annotations(ctx);
         }
-        virtual void display_head_impl(execution_context const & ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const & ctx, std::ostream & out) const override {
             out << "while";
             print_container(m_controls, out);
         }
-        virtual void display_body_impl(execution_context const & ctx, std::ostream & out, const std::string & indentation) const {
+        void display_body_impl(execution_context const & ctx, std::ostream & out, const std::string & indentation) const override {
             m_body->display_indented(ctx, out, indentation+"    ");
         }
     };
@@ -371,7 +371,7 @@ namespace datalog {
             const unsigned * cols2, reg_idx result)
             : m_rel1(rel1), m_rel2(rel2), m_cols1(col_cnt, cols1), 
             m_cols2(col_cnt, cols2), m_res(result) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             ++ctx.m_stats.m_join;
             if (!ctx.reg(m_rel1) || !ctx.reg(m_rel2)) {
@@ -408,13 +408,13 @@ namespace datalog {
             }
             return true;
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::string a1 = "rel1", a2 = "rel2";
             ctx.get_register_annotation(m_rel1, a1);
             ctx.get_register_annotation(m_rel1, a1);
             ctx.set_register_annotation(m_res, "join " + a1 + " " + a2);
         }
-        virtual void display_head_impl(execution_context const & ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const & ctx, std::ostream & out) const override {
             out << "join " << m_rel1;
             print_container(m_cols1, out);
             out << " and " << m_rel2;
@@ -435,7 +435,7 @@ namespace datalog {
     public:
         instr_filter_equal(ast_manager & m, reg_idx reg, const relation_element & value, unsigned col)
             : m_reg(reg), m_value(value, m), m_col(col) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             ++ctx.m_stats.m_filter_eq;
             if (!ctx.reg(m_reg)) {
@@ -460,12 +460,12 @@ namespace datalog {
             }
             return true;
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::stringstream a;
             a << "filter_equal " << m_col << " val: " << ctx.get_rel_context().get_rmanager().to_nice_string(m_value);
             ctx.set_register_annotation(m_reg, a.str());
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "filter_equal " << m_reg << " col: " << m_col << " val: "
                 << ctx.get_rel_context().get_rmanager().to_nice_string(m_value);
         }
@@ -484,7 +484,7 @@ namespace datalog {
     public:
         instr_filter_identical(reg_idx reg, unsigned col_cnt, const unsigned * identical_cols)
             : m_reg(reg), m_cols(col_cnt, identical_cols) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             ++ctx.m_stats.m_filter_id;
             if (!ctx.reg(m_reg)) {
@@ -509,11 +509,11 @@ namespace datalog {
             }
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "filter_identical " << m_reg << " ";
             print_container(m_cols, out);
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             ctx.set_register_annotation(m_reg, "filter_identical");
         }
     };
@@ -529,7 +529,7 @@ namespace datalog {
     public:
         instr_filter_interpreted(reg_idx reg, app_ref & condition)
             : m_reg(reg), m_cond(condition) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             if (!ctx.reg(m_reg)) {
                 return true;
             }
@@ -557,11 +557,11 @@ namespace datalog {
 
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "filter_interpreted " << m_reg << " using "
                 << mk_pp(m_cond, m_cond.get_manager());
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::stringstream a;
             a << "filter_interpreted " << mk_pp(m_cond, m_cond.get_manager());
             ctx.set_register_annotation(m_reg, a.str());
@@ -584,7 +584,7 @@ namespace datalog {
             : m_src(src), m_cond(condition), m_cols(col_cnt, removed_cols),
               m_res(result) {}
 
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             if (!ctx.reg(m_src)) {
                 ctx.make_empty(m_res);
@@ -614,14 +614,14 @@ namespace datalog {
             return true;
         }
 
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "filter_interpreted_and_project " << m_src << " into " << m_res;
             out << " using " << mk_pp(m_cond, m_cond.get_manager());
             out << " deleting columns ";
             print_container(m_cols, out);
         }
 
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::stringstream s;
             std::string a = "rel_src";
             ctx.get_register_annotation(m_src, a);
@@ -644,7 +644,7 @@ namespace datalog {
     public:
         instr_union(reg_idx src, reg_idx tgt, reg_idx delta, bool widen)
             : m_src(src), m_tgt(tgt), m_delta(delta), m_widen(widen) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             TRACE("dl", tout << "union " << m_src << " into " << m_tgt 
                   << " " << ctx.reg(m_src) << " " << ctx.reg(m_tgt) << "\n";);
             if (!ctx.reg(m_src)) {
@@ -721,7 +721,7 @@ namespace datalog {
 
             return true;
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::string str = "union";
             if (!ctx.get_register_annotation(m_tgt, str)) {
                 ctx.set_register_annotation(m_tgt, "union");
@@ -731,7 +731,7 @@ namespace datalog {
             }
             ctx.set_register_annotation(m_delta, str);            
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << (m_widen ? "widen " : "union ") << m_src << " into " << m_tgt;
             if (m_delta!=execution_context::void_register) {
                 out << " with delta " << m_delta;
@@ -758,7 +758,7 @@ namespace datalog {
         instr_project_rename(bool projection, reg_idx src, unsigned col_cnt, const unsigned * cols, 
             reg_idx tgt) : m_projection(projection), m_src(src), 
             m_cols(col_cnt, cols), m_tgt(tgt) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             if (!ctx.reg(m_src)) {
                 ctx.make_empty(m_tgt);
                 return true;
@@ -787,12 +787,12 @@ namespace datalog {
 
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << (m_projection ? "project " : "rename ") << m_src << " into " << m_tgt;
             out << (m_projection ? " deleting columns " : " with cycle ");
             print_container(m_cols, out);
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::stringstream s;
             std::string a = "rel_src";
             ctx.get_register_annotation(m_src, a);
@@ -825,7 +825,7 @@ namespace datalog {
             : m_rel1(rel1), m_rel2(rel2), m_cols1(joined_col_cnt, cols1), 
             m_cols2(joined_col_cnt, cols2), m_removed_cols(removed_col_cnt, removed_cols), m_res(result) {
         }
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             if (!ctx.reg(m_rel1) || !ctx.reg(m_rel2)) {
                 ctx.make_empty(m_res);
@@ -852,7 +852,7 @@ namespace datalog {
             }
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             relation_base const* r1 = ctx.reg(m_rel1);
             relation_base const* r2 = ctx.reg(m_rel2);
             out << "join_project " << m_rel1;            
@@ -870,7 +870,7 @@ namespace datalog {
             out << " into " << m_res << " removing columns ";
             print_container(m_removed_cols, out);
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::string s1 = "rel1", s2 = "rel2";
             ctx.get_register_annotation(m_rel1, s1);
             ctx.get_register_annotation(m_rel2, s2);
@@ -898,7 +898,7 @@ namespace datalog {
             // TRACE("dl", tout << "src:"  << m_src << " result: " << m_result << " value:" << m_value << " column:" << m_col << "\n";);
         }
 
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             if (!ctx.reg(m_src)) {
                 ctx.make_empty(m_result);
                 return true;
@@ -923,11 +923,11 @@ namespace datalog {
             }
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "select_equal_and_project " << m_src <<" into " << m_result << " col: " << m_col 
                 << " val: " << ctx.get_rel_context().get_rmanager().to_nice_string(m_value);
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::stringstream s;
             std::string s1 = "src";
             ctx.get_register_annotation(m_src, s1);
@@ -953,7 +953,7 @@ namespace datalog {
         instr_filter_by_negation(reg_idx tgt, reg_idx neg_rel, unsigned col_cnt, const unsigned * cols1, 
             const unsigned * cols2)
             : m_tgt(tgt), m_neg_rel(neg_rel), m_cols1(col_cnt, cols1), m_cols2(col_cnt, cols2) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             if (!ctx.reg(m_tgt) || !ctx.reg(m_neg_rel)) {
                 return true;
@@ -980,14 +980,14 @@ namespace datalog {
             }
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "filter_by_negation on " << m_tgt;
             print_container(m_cols1, out);
             out << " with " << m_neg_rel;
             print_container(m_cols2, out);
             out << " as the negated table";
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::string s = "negated relation";
             ctx.get_register_annotation(m_neg_rel, s);
             ctx.set_register_annotation(m_tgt, "filter by negation " + s);            
@@ -1011,7 +1011,7 @@ namespace datalog {
             m_sig.push_back(s);
             m_fact.push_back(val);
         }
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             ++ctx.m_stats.m_unary_singleton;
             relation_base * rel = ctx.get_rel_context().get_rmanager().mk_empty_relation(m_sig, m_pred);
@@ -1019,12 +1019,12 @@ namespace datalog {
             ctx.set_reg(m_tgt, rel);
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "mk_unary_singleton into " << m_tgt << " sort:" 
                 << ctx.get_rel_context().get_rmanager().to_nice_string(m_sig[0]) << " val:" 
                 << ctx.get_rel_context().get_rmanager().to_nice_string(m_sig[0], m_fact[0]);
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::string s;
             if (!ctx.get_register_annotation(m_tgt, s)) {
                 ctx.set_register_annotation(m_tgt, "mk unary singleton");
@@ -1044,18 +1044,18 @@ namespace datalog {
         reg_idx m_tgt;
     public:
         instr_mk_total(const relation_signature & sig, func_decl* p, reg_idx tgt) : m_sig(sig), m_pred(p), m_tgt(tgt) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             ++ctx.m_stats.m_total;
             ctx.set_reg(m_tgt, ctx.get_rel_context().get_rmanager().mk_full_relation(m_sig, m_pred));
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "mk_total into " << m_tgt << " sort:" 
                 << ctx.get_rel_context().get_rmanager().to_nice_string(m_sig)
                 << " " << m_pred->get_name();
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::string s;
             if (!ctx.get_register_annotation(m_tgt, s)) {
                 ctx.set_register_annotation(m_tgt, "mk_total");
@@ -1072,15 +1072,15 @@ namespace datalog {
     public:
         instr_mark_saturated(ast_manager & m, func_decl * pred) 
             : m_pred(pred, m) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             ctx.get_rel_context().get_rmanager().mark_saturated(m_pred);
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "mark_saturated " << m_pred->get_name().bare_str();
         }
-        virtual void make_annotations(execution_context & ctx) {            
+        void make_annotations(execution_context & ctx) override {
         }
     };
 
@@ -1094,18 +1094,18 @@ namespace datalog {
     public:
         instr_assert_signature(const relation_signature & s, reg_idx tgt) 
             : m_sig(s), m_tgt(tgt) {}
-        virtual bool perform(execution_context & ctx) {
+        bool perform(execution_context & ctx) override {
             log_verbose(ctx);            
             if (ctx.reg(m_tgt)) {
                 SASSERT(ctx.reg(m_tgt)->get_signature()==m_sig);
             }
             return true;
         }
-        virtual void display_head_impl(execution_context const& ctx, std::ostream & out) const {
+        void display_head_impl(execution_context const& ctx, std::ostream & out) const override {
             out << "instr_assert_signature of " << m_tgt << " signature:";
             print_container(m_sig, out);
         }
-        virtual void make_annotations(execution_context & ctx) {
+        void make_annotations(execution_context & ctx) override {
             std::string s;
             if (!ctx.get_register_annotation(m_tgt, s)) {
                 ctx.set_register_annotation(m_tgt, "assert signature");

src/muz/rel/dl_interval_relation.cpp

@@ -59,7 +59,7 @@ namespace datalog {
             : convenient_relation_join_fn(o1_sig, o2_sig, col_cnt, cols1, cols2){
         }
 
-        virtual relation_base * operator()(const relation_base & _r1, const relation_base & _r2) {
+        relation_base * operator()(const relation_base & _r1, const relation_base & _r2) override {
             interval_relation const& r1 = get(_r1);
             interval_relation const& r2 = get(_r2);
             interval_relation_plugin& p = r1.get_plugin();
@@ -84,7 +84,7 @@ namespace datalog {
             : convenient_relation_project_fn(orig_sig, removed_col_cnt, removed_cols) {
         }
 
-        virtual relation_base * operator()(const relation_base & _r) {
+        relation_base * operator()(const relation_base & _r) override {
             interval_relation const& r = get(_r);
             interval_relation_plugin& p = r.get_plugin();
             interval_relation* result = dynamic_cast<interval_relation*>(p.mk_full(0, get_result_signature()));            
@@ -104,7 +104,7 @@ namespace datalog {
             : convenient_relation_rename_fn(orig_sig, cycle_len, cycle) {
         }
 
-        virtual relation_base * operator()(const relation_base & _r) {
+        relation_base * operator()(const relation_base & _r) override {
             interval_relation const& r = get(_r);
             interval_relation_plugin& p = r.get_plugin();
             interval_relation* result = dynamic_cast<interval_relation*>(p.mk_full(0, get_result_signature()));
@@ -198,7 +198,7 @@ namespace datalog {
             m_is_widen(is_widen) {            
         }
 
-        virtual void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) {
+        void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) override {
 
             TRACE("interval_relation", _r.display(tout << "dst:\n"); _src.display(tout  << "src:\n"););
 
@@ -237,7 +237,7 @@ namespace datalog {
         filter_identical_fn(unsigned col_cnt, const unsigned * identical_cols) 
             : m_identical_cols(col_cnt, identical_cols) {}
 
-        virtual void operator()(relation_base & r) {
+        void operator()(relation_base & r) override {
             interval_relation & pr = get(r);
             for (unsigned i = 1; i < m_identical_cols.size(); ++i) {
                 unsigned c1 = m_identical_cols[0];
@@ -266,7 +266,7 @@ namespace datalog {
             VERIFY(arith.is_numeral(value, m_value));            
         }
 
-        virtual void operator()(relation_base & _r) {
+        void operator()(relation_base & _r) override {
             interval_relation & r = get(_r);
             interval_relation_plugin & p = r.get_plugin();
             r.mk_intersect(m_col, interval(p.dep(), m_value));
@@ -290,7 +290,7 @@ namespace datalog {
             m_cond(cond, t.get_plugin().get_ast_manager()) {
         }
 
-        void operator()(relation_base& t) {
+        void operator()(relation_base& t) override {
             get(t).filter_interpreted(m_cond);
             TRACE("interval_relation", tout << mk_pp(m_cond, m_cond.get_manager()) << "\n"; t.display(tout););
         }

src/muz/rel/dl_interval_relation.h

@@ -53,25 +53,25 @@ namespace datalog {
 
     public:
         interval_relation_plugin(relation_manager& m);
-        virtual bool can_handle_signature(const relation_signature & s);
+        bool can_handle_signature(const relation_signature & s) override;
         static symbol get_name() { return symbol("interval_relation"); }
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s);
+        relation_base * mk_full(func_decl* p, const relation_signature & s) override;
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
 
         static bool is_empty(unsigned idx, interval const& i);
         static bool is_infinite(interval const& i);
@@ -97,39 +97,39 @@ namespace datalog {
     public:
         interval_relation(interval_relation_plugin& p, relation_signature const& s, bool is_empty);
 
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
-        virtual interval_relation * clone() const;
+        interval_relation * clone() const override;
-        virtual interval_relation * complement(func_decl*) const;
+        interval_relation * complement(func_decl*) const override;
-        virtual void to_formula(expr_ref& fml) const;
+        void to_formula(expr_ref& fml) const override;
         interval_relation_plugin& get_plugin() const; 
 
         void filter_interpreted(app* cond);
-        virtual bool is_precise() const { return false; }
+        bool is_precise() const override { return false; }
 
     private:
 
-        virtual interval mk_intersect(interval const& t1, interval const& t2, bool& is_empty) const { 
+        interval mk_intersect(interval const& t1, interval const& t2, bool& is_empty) const override {
             return get_plugin().meet(t1, t2, is_empty); 
         }
 
-        virtual interval mk_unite(interval const& t1, interval const& t2) const { return get_plugin().unite(t1,t2); }
+        interval mk_unite(interval const& t1, interval const& t2) const override { return get_plugin().unite(t1,t2); }
 
-        virtual interval mk_widen(interval const& t1, interval const& t2) const { return get_plugin().widen(t1,t2); }
+        interval mk_widen(interval const& t1, interval const& t2) const override { return get_plugin().widen(t1,t2); }
 
-        virtual bool is_subset_of(interval const& t1, interval const& t2) const { NOT_IMPLEMENTED_YET(); return false; }
+        bool is_subset_of(interval const& t1, interval const& t2) const override { NOT_IMPLEMENTED_YET(); return false; }
 
-        virtual bool is_full(interval const& t) const { 
+        bool is_full(interval const& t) const override {
             return interval_relation_plugin::is_infinite(t);
         }
 
-        virtual bool is_empty(unsigned idx, interval const& t) const {
+        bool is_empty(unsigned idx, interval const& t) const override {
             return interval_relation_plugin::is_empty(idx, t);
         }
 
-        virtual void mk_rename_elem(interval& i, unsigned col_cnt, unsigned const* cycle);
+        void mk_rename_elem(interval& i, unsigned col_cnt, unsigned const* cycle) override;
 
-        virtual void display_index(unsigned idx, interval const & i, std::ostream& out) const;
+        void display_index(unsigned idx, interval const & i, std::ostream& out) const override;
 
         void mk_intersect(unsigned idx, interval const& i);
 

src/muz/rel/dl_lazy_table.cpp

@@ -50,7 +50,7 @@ namespace datalog {
                 unsigned const* cols1, unsigned const* cols2):
             convenient_table_join_fn(s1, s2, col_cnt, cols1, cols2) {}
                                   
-        virtual table_base* operator()(const table_base& _t1, const table_base& _t2) {
+        table_base* operator()(const table_base& _t1, const table_base& _t2) override {
             lazy_table const& t1 = get(_t1);
             lazy_table const& t2 = get(_t2);
             lazy_table_ref* tr = alloc(lazy_table_join, m_cols1.size(), m_cols1.c_ptr(), m_cols2.c_ptr(), t1, t2, get_result_signature());
@@ -75,7 +75,7 @@ namespace datalog {
     class lazy_table_plugin::union_fn : public table_union_fn {
     public:
         void operator()(table_base & _tgt, const table_base & _src, 
-                        table_base * _delta) {
+                        table_base * _delta) override {
             lazy_table& tgt = get(_tgt);
             lazy_table const& src = get(_src);
             lazy_table* delta = get(_delta);  
@@ -111,7 +111,7 @@ namespace datalog {
             convenient_table_project_fn(orig_sig, cnt, cols)
         {}
 
-        virtual table_base* operator()(table_base const& _t) {
+        table_base* operator()(table_base const& _t) override {
             lazy_table const& t = get(_t);
             return alloc(lazy_table, alloc(lazy_table_project, m_removed_cols.size(), m_removed_cols.c_ptr(), t, get_result_signature()));
         }
@@ -137,7 +137,7 @@ namespace datalog {
             convenient_table_rename_fn(orig_sig, cnt, cols)
         {}
 
-        virtual table_base* operator()(table_base const& _t) {
+        table_base* operator()(table_base const& _t) override {
             lazy_table const& t = get(_t);
             return alloc(lazy_table, alloc(lazy_table_rename, m_cycle.size(), m_cycle.c_ptr(), t, get_result_signature()));
         }
@@ -163,7 +163,7 @@ namespace datalog {
     public:
         filter_identical_fn(unsigned cnt, unsigned const* cols): m_cols(cnt, cols) {}
         
-        virtual void operator()(table_base& _t) {
+        void operator()(table_base& _t) override {
             lazy_table& t = get(_t);
             t.set(alloc(lazy_table_filter_identical, m_cols.size(), m_cols.c_ptr(), t));
         }
@@ -188,7 +188,7 @@ namespace datalog {
     public:
         filter_interpreted_fn(app_ref& p): m_condition(p) {}
 
-        virtual void operator()(table_base& _t) {
+        void operator()(table_base& _t) override {
             lazy_table& t = get(_t);
             t.set(alloc(lazy_table_filter_interpreted, t, m_condition));
         }
@@ -214,7 +214,7 @@ namespace datalog {
     public:
         filter_by_negation_fn(unsigned cnt, unsigned const* cols1, unsigned const* cols2):
             m_cols1(cnt, cols1), m_cols2(cnt, cols2) {}
-        virtual void operator()(table_base & _t, const table_base & _intersected_obj) {
+        void operator()(table_base & _t, const table_base & _intersected_obj) override {
             lazy_table& t = get(_t);
             lazy_table const& it = get(_intersected_obj);
             t.set(alloc(lazy_table_filter_by_negation, t, it, m_cols1, m_cols2));
@@ -246,7 +246,7 @@ namespace datalog {
             m_col(col)
         { }
 
-        virtual void operator()(table_base& _t) {
+        void operator()(table_base& _t) override {
             lazy_table& t = get(_t);
             t.set(alloc(lazy_table_filter_equal, m_col, m_value, t));
         }

src/muz/rel/dl_lazy_table.h

@@ -48,37 +48,37 @@ namespace datalog {
             table_plugin(mk_name(p), p.get_manager()), 
             m_plugin(p) {}
         
-        virtual bool can_handle_signature(const table_signature & s) {
+        bool can_handle_signature(const table_signature & s) override {
             return m_plugin.can_handle_signature(s);
         } 
         
-        virtual table_base * mk_empty(const table_signature & s);
+        table_base * mk_empty(const table_signature & s) override;
                 
         static table_plugin* mk_sparse(relation_manager& rm);
         
     protected:
-        virtual table_join_fn * mk_join_fn(
+        table_join_fn * mk_join_fn(
             const table_base & t1, const table_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual table_union_fn * mk_union_fn(
+        table_union_fn * mk_union_fn(
             const table_base & tgt, const table_base & src,
-            const table_base * delta);
+            const table_base * delta) override;
-        virtual table_transformer_fn * mk_project_fn(
+        table_transformer_fn * mk_project_fn(
             const table_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual table_transformer_fn * mk_rename_fn(
+        table_transformer_fn * mk_rename_fn(
             const table_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual table_mutator_fn * mk_filter_identical_fn(
+        table_mutator_fn * mk_filter_identical_fn(
-            const table_base & t, unsigned col_cnt, const unsigned * identical_cols);
+            const table_base & t, unsigned col_cnt, const unsigned * identical_cols) override;
-        virtual table_mutator_fn * mk_filter_equal_fn(
+        table_mutator_fn * mk_filter_equal_fn(
-            const table_base & t, const table_element & value, unsigned col);
+            const table_base & t, const table_element & value, unsigned col) override;
-        virtual table_mutator_fn * mk_filter_interpreted_fn(
+        table_mutator_fn * mk_filter_interpreted_fn(
-            const table_base & t, app * condition);
+            const table_base & t, app * condition) override;
-        virtual table_intersection_filter_fn * mk_filter_by_negation_fn(
+        table_intersection_filter_fn * mk_filter_by_negation_fn(
             const table_base & t,
             const table_base & negated_obj, unsigned joined_col_cnt,
-            const unsigned * t_cols, const unsigned * negated_cols);        
+            const unsigned * t_cols, const unsigned * negated_cols) override;
 
         static lazy_table const& get(table_base const& tb);
         static lazy_table& get(table_base& tb);
@@ -129,30 +129,30 @@ namespace datalog {
             m_ref(t)
         {}
 
-        virtual ~lazy_table() {}
+        ~lazy_table() override {}
 
         lazy_table_plugin& get_lplugin() const { 
             return dynamic_cast<lazy_table_plugin&>(table_base::get_plugin()); 
         }
 
-        virtual table_base * clone() const;
+        table_base * clone() const override;
-        virtual table_base * complement(func_decl* p, const table_element * func_columns = 0) const;
+        table_base * complement(func_decl* p, const table_element * func_columns = 0) const override;
-        virtual bool empty() const;
+        bool empty() const override;
-        virtual bool contains_fact(const table_fact & f) const;
+        bool contains_fact(const table_fact & f) const override;
-        virtual void remove_fact(table_element const* fact);
+        void remove_fact(table_element const* fact) override;
-        virtual void remove_facts(unsigned fact_cnt, const table_fact * facts);
+        void remove_facts(unsigned fact_cnt, const table_fact * facts) override;
-        virtual void remove_facts(unsigned fact_cnt, const table_element * facts);
+        void remove_facts(unsigned fact_cnt, const table_element * facts) override;
-        virtual void reset();
+        void reset() override;
-        virtual void add_fact(table_fact const& f);
+        void add_fact(table_fact const& f) override;
        
-        virtual unsigned get_size_estimate_rows() const { return 1; }
+        unsigned get_size_estimate_rows() const override { return 1; }
-        virtual unsigned get_size_estimate_bytes() const { return 1; }
+        unsigned get_size_estimate_bytes() const override { return 1; }
-        virtual bool knows_exact_size() const { return false; }
+        bool knows_exact_size() const override { return false; }
 
         table_base* eval() const;
 
-        virtual table_base::iterator begin() const;
+        table_base::iterator begin() const override;
-        virtual table_base::iterator end() const;
+        table_base::iterator end() const override;
 
         lazy_table_ref* get_ref() const { return m_ref.get(); }
         void set(lazy_table_ref* r) { m_ref = r; }
@@ -165,9 +165,9 @@ namespace datalog {
             m_table = table;
             // SASSERT(&p.m_plugin == &table->get_lplugin());
         }
-        virtual ~lazy_table_base() {}
+        ~lazy_table_base() override {}
-        virtual lazy_table_kind kind() const { return LAZY_TABLE_BASE; }
+        lazy_table_kind kind() const override { return LAZY_TABLE_BASE; }
-        virtual table_base* force() { return m_table.get(); }       
+        table_base* force() override { return m_table.get(); }
     };
 
     class lazy_table_join : public lazy_table_ref {
@@ -184,13 +184,13 @@ namespace datalog {
               m_cols2(col_cnt, cols2),
               m_t1(t1.get_ref()),
               m_t2(t2.get_ref()) { }
-        virtual ~lazy_table_join() {}
+        ~lazy_table_join() override {}
-        virtual lazy_table_kind kind() const { return LAZY_TABLE_JOIN; }
+        lazy_table_kind kind() const override { return LAZY_TABLE_JOIN; }
         unsigned_vector const& cols1() const { return m_cols1; }
         unsigned_vector const& cols2() const { return m_cols2; }
         lazy_table_ref* t1() const { return m_t1.get(); }
         lazy_table_ref* t2() const { return m_t2.get(); }
-        virtual table_base* force();
+        table_base* force() override;
     };
 
 
@@ -202,12 +202,12 @@ namespace datalog {
             : lazy_table_ref(src.get_lplugin(), sig), 
               m_cols(col_cnt, cols), 
               m_src(src.get_ref()) {}
-        virtual ~lazy_table_project() {}
+        ~lazy_table_project() override {}
         
-        virtual lazy_table_kind kind() const { return LAZY_TABLE_PROJECT; }
+        lazy_table_kind kind() const override { return LAZY_TABLE_PROJECT; }
         unsigned_vector const& cols() const { return m_cols; }
         lazy_table_ref* src() const { return m_src.get(); }
-        virtual table_base* force();
+        table_base* force() override;
     };
 
     class lazy_table_rename : public lazy_table_ref {
@@ -218,12 +218,12 @@ namespace datalog {
             : lazy_table_ref(src.get_lplugin(), sig), 
               m_cols(col_cnt, cols), 
               m_src(src.get_ref()) {}
-        virtual ~lazy_table_rename() {}
+        ~lazy_table_rename() override {}
         
-        virtual lazy_table_kind kind() const { return LAZY_TABLE_RENAME; }
+        lazy_table_kind kind() const override { return LAZY_TABLE_RENAME; }
         unsigned_vector const& cols() const { return m_cols; }
         lazy_table_ref* src() const { return m_src.get(); }
-        virtual table_base* force();
+        table_base* force() override;
     };
 
     class lazy_table_filter_identical : public lazy_table_ref {
@@ -232,12 +232,12 @@ namespace datalog {
     public:
         lazy_table_filter_identical(unsigned col_cnt, const unsigned * cols, lazy_table const& src)
             : lazy_table_ref(src.get_lplugin(), src.get_signature()), m_cols(col_cnt, cols), m_src(src.get_ref()) {}
-        virtual ~lazy_table_filter_identical() {}
+        ~lazy_table_filter_identical() override {}
         
-        virtual lazy_table_kind kind() const { return LAZY_TABLE_FILTER_IDENTICAL; }
+        lazy_table_kind kind() const override { return LAZY_TABLE_FILTER_IDENTICAL; }
         unsigned_vector const& cols() const { return m_cols; }
         lazy_table_ref* src() const { return m_src.get(); }
-        virtual table_base* force();
+        table_base* force() override;
     };
 
     class lazy_table_filter_equal : public lazy_table_ref {
@@ -250,13 +250,13 @@ namespace datalog {
             m_col(col), 
             m_value(value), 
             m_src(src.get_ref()) {}
-        virtual ~lazy_table_filter_equal() {}
+        ~lazy_table_filter_equal() override {}
         
-        virtual lazy_table_kind kind() const { return LAZY_TABLE_FILTER_EQUAL; }
+        lazy_table_kind kind() const override { return LAZY_TABLE_FILTER_EQUAL; }
         unsigned        col() const { return m_col; }
         table_element   value() const { return m_value; }
         lazy_table_ref* src() const { return m_src.get(); }
-        virtual table_base* force();
+        table_base* force() override;
     };
 
     class lazy_table_filter_interpreted : public lazy_table_ref {
@@ -266,12 +266,12 @@ namespace datalog {
         lazy_table_filter_interpreted(lazy_table const& src, app* condition)
             : lazy_table_ref(src.get_lplugin(), src.get_signature()), 
               m_condition(condition, src.get_lplugin().get_ast_manager()), m_src(src.get_ref()) {}
-        virtual ~lazy_table_filter_interpreted() {}
+        ~lazy_table_filter_interpreted() override {}
         
-        virtual lazy_table_kind kind() const { return LAZY_TABLE_FILTER_INTERPRETED; }
+        lazy_table_kind kind() const override { return LAZY_TABLE_FILTER_INTERPRETED; }
         app* condition() const { return m_condition; }        
         lazy_table_ref* src() const { return m_src.get(); }
-        virtual table_base* force();
+        table_base* force() override;
     };
 
 
@@ -288,13 +288,13 @@ namespace datalog {
             m_src(src.get_ref()), 
             m_cols1(c1),
             m_cols2(c2) {}
-        virtual ~lazy_table_filter_by_negation() {}
+        ~lazy_table_filter_by_negation() override {}
-        virtual lazy_table_kind kind() const { return LAZY_TABLE_FILTER_BY_NEGATION; }
+        lazy_table_kind kind() const override { return LAZY_TABLE_FILTER_BY_NEGATION; }
         lazy_table_ref* tgt() const { return m_tgt.get(); }
         lazy_table_ref* src() const { return m_src.get(); }
         unsigned_vector const& cols1() const { return m_cols1; }
         unsigned_vector const& cols2() const { return m_cols2; }
-        virtual table_base* force();
+        table_base* force() override;
     };
 
 

src/muz/rel/dl_mk_explanations.cpp

@@ -69,7 +69,7 @@ namespace datalog {
             m_relation_level_explanations(relation_level),
             m_union_decl(mk_explanations::get_union_decl(get_context()), get_ast_manager()) {}
 
-        ~explanation_relation_plugin() {
+        ~explanation_relation_plugin() override {
             for (unsigned i = 0; i < m_pool.size(); ++i) {
                 for (unsigned j = 0; j < m_pool[i].size(); ++j) {
                     dealloc(m_pool[i][j]);
@@ -77,7 +77,7 @@ namespace datalog {
             }
         }
 
-        virtual bool can_handle_signature(const relation_signature & s) {
+        bool can_handle_signature(const relation_signature & s) override {
             unsigned n=s.size();
             for (unsigned i=0; i<n; i++) {
                 if (!get_context().get_decl_util().is_rule_sort(s[i])) {
@@ -87,27 +87,27 @@ namespace datalog {
             return true;
         }
         
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
 
         void recycle(explanation_relation* r);
 
     protected:
 
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t, 
+        relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t,
             const relation_base & negated_obj, unsigned joined_col_cnt,
-            const unsigned * t_cols, const unsigned * negated_cols);
+            const unsigned * t_cols, const unsigned * negated_cols) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_intersection_fn(const relation_base & t, 
+        relation_intersection_filter_fn * mk_filter_by_intersection_fn(const relation_base & t,
                 const relation_base & src, unsigned joined_col_cnt,
-                const unsigned * t_cols, const unsigned * src_cols);
+                const unsigned * t_cols, const unsigned * src_cols) override;
 
     };
 
@@ -173,7 +173,7 @@ namespace datalog {
             }
         }
 
-        virtual void deallocate() {
+        void deallocate() override {
             get_plugin().recycle(this);
         }
 
@@ -183,7 +183,7 @@ namespace datalog {
             return static_cast<explanation_relation_plugin &>(relation_base::get_plugin());
         }
 
-        virtual void to_formula(expr_ref& fml) const {    
+        void to_formula(expr_ref& fml) const override {
             ast_manager& m = fml.get_manager();
             fml = m.mk_eq(m.mk_var(0, m.get_sort(m_data[0])), m_data[0]);
         }
@@ -204,23 +204,23 @@ namespace datalog {
             return true;
         }
 
-        virtual bool empty() const { return m_empty; }
+        bool empty() const override { return m_empty; }
 
-        virtual void reset() {
+        void reset() override {
             m_empty = true;
         }
 
-        virtual void add_fact(const relation_fact & f) {
+        void add_fact(const relation_fact & f) override {
             SASSERT(empty());
             assign_data(f);
         }
 
-        virtual bool contains_fact(const relation_fact & f) const {
+        bool contains_fact(const relation_fact & f) const override {
             UNREACHABLE();
             throw 0;
         }
 
-        virtual explanation_relation * clone() const {
+        explanation_relation * clone() const override {
             explanation_relation * res = static_cast<explanation_relation *>(get_plugin().mk_empty(get_signature()));
             res->m_empty = m_empty;
             SASSERT(res->m_data.empty());
@@ -228,7 +228,7 @@ namespace datalog {
             return res;
         }
 
-        virtual relation_base * complement(func_decl* pred) const {
+        relation_base * complement(func_decl* pred) const override {
             explanation_relation * res = static_cast<explanation_relation *>(get_plugin().mk_empty(get_signature()));
             if (empty()) {
                 res->set_undefined();
@@ -247,7 +247,7 @@ namespace datalog {
             }
         }
 
-        virtual void display(std::ostream & out) const {
+        void display(std::ostream & out) const override {
             if (empty()) {
                 out << "<empty explanation relation>\n";
                 return;
@@ -298,7 +298,7 @@ namespace datalog {
         join_fn(const relation_signature & sig1, const relation_signature & sig2)
             : convenient_relation_join_fn(sig1, sig2, 0, 0, 0) {}
 
-        virtual relation_base * operator()(const relation_base & r1_0, const relation_base & r2_0) {
+        relation_base * operator()(const relation_base & r1_0, const relation_base & r2_0) override {
             const explanation_relation & r1 = static_cast<const explanation_relation &>(r1_0);
             const explanation_relation & r2 = static_cast<const explanation_relation &>(r2_0);
             explanation_relation_plugin & plugin = r1.get_plugin();
@@ -331,7 +331,7 @@ namespace datalog {
         project_fn(const relation_signature & sig, unsigned col_cnt, const unsigned * removed_cols)
             : convenient_relation_project_fn(sig, col_cnt, removed_cols) {}
 
-        virtual relation_base * operator()(const relation_base & r0) {
+        relation_base * operator()(const relation_base & r0) override {
             const explanation_relation & r = static_cast<const explanation_relation &>(r0);
             explanation_relation_plugin & plugin = r.get_plugin();
 
@@ -359,7 +359,7 @@ namespace datalog {
         rename_fn(const relation_signature & sig, unsigned permutation_cycle_len, const unsigned * permutation_cycle)
             : convenient_relation_rename_fn(sig, permutation_cycle_len, permutation_cycle) {}
 
-        virtual relation_base * operator()(const relation_base & r0) {
+        relation_base * operator()(const relation_base & r0) override {
             const explanation_relation & r = static_cast<const explanation_relation &>(r0);
             explanation_relation_plugin & plugin = r.get_plugin();
 
@@ -382,7 +382,7 @@ namespace datalog {
     class explanation_relation_plugin::union_fn : public relation_union_fn {
         scoped_ptr<relation_union_fn> m_delta_union_fun;
     public:
-        virtual void operator()(relation_base & tgt0, const relation_base & src0, relation_base * delta0) {
+        void operator()(relation_base & tgt0, const relation_base & src0, relation_base * delta0) override {
             explanation_relation & tgt = static_cast<explanation_relation &>(tgt0);
             const explanation_relation & src = static_cast<const explanation_relation &>(src0);
             explanation_relation * delta = delta0 ? static_cast<explanation_relation *>(delta0) : 0;
@@ -418,7 +418,7 @@ namespace datalog {
     class explanation_relation_plugin::foreign_union_fn : public relation_union_fn {
         scoped_ptr<relation_union_fn> m_delta_union_fun;
     public:
-        virtual void operator()(relation_base & tgt0, const relation_base & src, relation_base * delta0) {
+        void operator()(relation_base & tgt0, const relation_base & src, relation_base * delta0) override {
             explanation_relation & tgt = static_cast<explanation_relation &>(tgt0);
             explanation_relation * delta = delta0 ? static_cast<explanation_relation *>(delta0) : 0;
 
@@ -456,7 +456,7 @@ namespace datalog {
               m_col_idx(col_idx), 
               m_new_rule(std::move(new_rule)) {}
 
-        virtual void operator()(relation_base & r0) {
+        void operator()(relation_base & r0) override {
             explanation_relation & r = static_cast<explanation_relation &>(r0);
 
             if (!r.is_undefined(m_col_idx)) {
@@ -509,7 +509,7 @@ namespace datalog {
 
     class explanation_relation_plugin::negation_filter_fn : public relation_intersection_filter_fn {
     public:
-        virtual void operator()(relation_base & r, const relation_base & neg) {
+        void operator()(relation_base & r, const relation_base & neg) override {
             if (!neg.empty()) {
                 r.reset();
             }
@@ -531,7 +531,7 @@ namespace datalog {
         intersection_filter_fn(explanation_relation_plugin & plugin)
             : m_union_decl(plugin.m_union_decl) {}
 
-        virtual void operator()(relation_base & tgt0, const relation_base & src0) {
+        void operator()(relation_base & tgt0, const relation_base & src0) override {
             explanation_relation & tgt = static_cast<explanation_relation &>(tgt0);
             const explanation_relation & src = static_cast<const explanation_relation &>(src0);
 

src/muz/rel/dl_mk_explanations.h

@@ -76,7 +76,7 @@ namespace datalog {
             return get_union_decl(m_context);
         }
 
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
 
         static expr* get_explanation(relation_base const& r);
     };

src/muz/rel/dl_mk_similarity_compressor.h

@@ -69,7 +69,7 @@ namespace datalog {
     public:
         mk_similarity_compressor(context & ctx);
         
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
     };
 
 };

src/muz/rel/dl_mk_simple_joins.h

@@ -54,7 +54,7 @@ namespace datalog {
     public:
         mk_simple_joins(context & ctx);
         
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
     };
 
 };

src/muz/rel/dl_product_relation.cpp

@@ -444,12 +444,12 @@ namespace datalog {
             init(r1.get_signature(), 1, rels1, r2.get_signature(), 1, rels2, col_cnt, cols1, cols2);
         }
 
-        ~join_fn() { 
+        ~join_fn() override {
             dealloc_ptr_vector_content(m_joins);
             dealloc_ptr_vector_content(m_full);
         }
 
-        virtual relation_base * operator()(const relation_base & _r1, const relation_base & _r2) {
+        relation_base * operator()(const relation_base & _r1, const relation_base & _r2) override {
             TRACE("dl", _r1.display(tout); _r2.display(tout););
             ptr_vector<relation_base> relations;
             unsigned sz = m_joins.size();
@@ -491,9 +491,9 @@ namespace datalog {
           m_sig(std::move(s)),
           m_transforms(num_trans, trans) {}
 
-          ~transform_fn() { dealloc_ptr_vector_content(m_transforms); }
+          ~transform_fn() override { dealloc_ptr_vector_content(m_transforms); }
 
-        virtual relation_base * operator()(const relation_base & _r) {
+        relation_base * operator()(const relation_base & _r) override {
             product_relation const& r = get(_r);
             product_relation_plugin& p = r.get_plugin();
             SASSERT(m_transforms.size() == r.size());
@@ -628,14 +628,14 @@ namespace datalog {
             init(tgt.m_relations, src.m_relations, delta ? &delta->m_relations : 0);
         }
 
-        ~aligned_union_fn() {
+        ~aligned_union_fn() override {
             unsigned sz = m_unions.size();
             for(unsigned i=0; i<sz; i++) {
                 dealloc_ptr_vector_content(m_unions[i]);
             }
         }
 
-        virtual void operator()(relation_base& _tgt, const relation_base& _src, relation_base* _delta) {
+        void operator()(relation_base& _tgt, const relation_base& _src, relation_base* _delta) override {
             TRACE("dl", _tgt.display(tout << "dst:\n"); _src.display(tout  << "src:\n"););
             SASSERT(m_plugin.check_kind(_tgt));
             SASSERT(m_plugin.check_kind(_src));
@@ -748,7 +748,7 @@ namespace datalog {
         }
 
 
-        virtual void operator()(relation_base& _tgt, const relation_base& _src, relation_base* _delta) {
+        void operator()(relation_base& _tgt, const relation_base& _src, relation_base* _delta) override {
             TRACE("dl_verbose", _tgt.display(tout << "dst:\n"); _src.display(tout  << "src:\n"););
             product_relation& tgt = get(_tgt);
             product_relation const& src0 = get(_src);
@@ -783,7 +783,7 @@ namespace datalog {
                 : m_single_rel_idx(single_rel_idx),
                 m_inner_union_fun(inner_union_fun) {}
 
-        virtual void operator()(relation_base& tgt, const relation_base& _src, relation_base* delta) {
+        void operator()(relation_base& tgt, const relation_base& _src, relation_base* delta) override {
             TRACE("dl", tgt.display(tout); _src.display(tout); );
             product_relation const& src = get(_src);
             (*m_inner_union_fun)(tgt, src[m_single_rel_idx], delta);
@@ -834,9 +834,9 @@ namespace datalog {
         mutator_fn(unsigned sz, relation_mutator_fn** muts):
           m_mutators(sz, muts) {}
 
-       ~mutator_fn() { dealloc_ptr_vector_content(m_mutators); }
+       ~mutator_fn() override { dealloc_ptr_vector_content(m_mutators); }
 
-        virtual void operator()(relation_base & _r) {
+        void operator()(relation_base & _r) override {
             TRACE("dl", _r.display(tout););
             product_relation& r = get(_r);
             SASSERT(m_mutators.size() == r.size());
@@ -911,9 +911,9 @@ namespace datalog {
             }
         }
 
-        ~filter_interpreted_fn() { dealloc_ptr_vector_content(m_mutators); }
+        ~filter_interpreted_fn() override { dealloc_ptr_vector_content(m_mutators); }
 
-        void operator()(relation_base& _r) {
+        void operator()(relation_base& _r) override {
             TRACE("dl", _r.display(tout););
             product_relation const& r = get(_r);
             for (unsigned i = 0; i < m_attach.size(); ++i) {

src/muz/rel/dl_product_relation.h

@@ -59,37 +59,37 @@ namespace datalog {
 
         product_relation_plugin(relation_manager& m);
 
-        virtual void initialize(family_id fid);
+        void initialize(family_id fid) override;
 
-        virtual bool can_handle_signature(const relation_signature & s);
+        bool can_handle_signature(const relation_signature & s) override;
-        virtual bool can_handle_signature(const relation_signature & s, family_id kind);
+        bool can_handle_signature(const relation_signature & s, family_id kind) override;
 
         static symbol get_name() { return symbol("product_relation"); }
 
         family_id get_relation_kind(const relation_signature & sig, const rel_spec & spec);
 
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
-        virtual relation_base * mk_empty(const relation_signature & s, family_id kind);
+        relation_base * mk_empty(const relation_signature & s, family_id kind) override;
 
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s);
+        relation_base * mk_full(func_decl* p, const relation_signature & s) override;
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s, family_id kind);
+        relation_base * mk_full(func_decl* p, const relation_signature & s, family_id kind) override;
 
     protected:
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
 
         static bool is_product_relation(relation_base const& r);
 
@@ -154,15 +154,15 @@ namespace datalog {
         product_relation(product_relation_plugin& p, relation_signature const& s);
         product_relation(product_relation_plugin& p, relation_signature const& s, unsigned num_relations, relation_base** relations);
 
-        ~product_relation();
+        ~product_relation() override;
 
-        virtual bool empty() const;
+        bool empty() const override;
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
-        virtual product_relation * clone() const;
+        product_relation * clone() const override;
-        virtual product_relation * complement(func_decl* p) const;
+        product_relation * complement(func_decl* p) const override;
-        virtual void display(std::ostream & out) const;
+        void display(std::ostream & out) const override;
-        virtual void to_formula(expr_ref& fml) const;
+        void to_formula(expr_ref& fml) const override;
         product_relation_plugin& get_plugin() const; 
 
         unsigned size() const { return m_relations.size(); }
@@ -175,7 +175,7 @@ namespace datalog {
         */
         bool try_get_single_non_transparent(unsigned & idx) const;
 
-        virtual bool is_precise() const { 
+        bool is_precise() const override {
             for (unsigned i = 0; i < m_relations.size(); ++i) {
                 if (!m_relations[i]->is_precise()) {
                     return false;

src/muz/rel/dl_relation_manager.cpp

@@ -538,7 +538,7 @@ namespace datalog {
 
     class relation_manager::empty_signature_relation_join_fn : public relation_join_fn {
     public:
-        virtual relation_base * operator()(const relation_base & r1, const relation_base & r2) {
+        relation_base * operator()(const relation_base & r1, const relation_base & r2) override {
             TRACE("dl", tout << r1.get_plugin().get_name() << " " << r2.get_plugin().get_name() << "\n";);
             if(r1.get_signature().empty()) {
                 if(r1.empty()) {
@@ -615,7 +615,7 @@ namespace datalog {
               m_project(0), 
               m_removed_cols(removed_col_cnt, removed_cols) {}
 
-        virtual relation_base * operator()(const relation_base & t) {
+        relation_base * operator()(const relation_base & t) override {
             scoped_rel<relation_base> t1 = t.clone();
             (*m_filter)(*t1);
             if( !m_project) {
@@ -658,11 +658,11 @@ namespace datalog {
         default_relation_apply_sequential_fn(unsigned n, relation_mutator_fn ** mutators):
             m_mutators(n, mutators) {            
         }
-        virtual ~default_relation_apply_sequential_fn() {
+        ~default_relation_apply_sequential_fn() override {
             std::for_each(m_mutators.begin(), m_mutators.end(), delete_proc<relation_mutator_fn>());
         }
         
-        virtual void operator()(relation_base& t) {
+        void operator()(relation_base& t) override {
             for (unsigned i = 0; i < m_mutators.size(); ++i) {
                 if (t.empty()) return;
                 (*(m_mutators[i]))(t);
@@ -688,7 +688,7 @@ namespace datalog {
             const unsigned * removed_cols)
             : m_join(join), m_project(0), m_removed_cols(removed_col_cnt, removed_cols) {}
 
-        virtual relation_base * operator()(const relation_base & t1, const relation_base & t2) {
+        relation_base * operator()(const relation_base & t1, const relation_base & t2) override {
             scoped_rel<relation_base> aux = (*m_join)(t1, t2);
             if(!m_project) {
                 relation_manager & rmgr = aux->get_plugin().get_manager();
@@ -787,7 +787,7 @@ namespace datalog {
         default_relation_select_equal_and_project_fn(relation_mutator_fn * filter, relation_transformer_fn * project)
             : m_filter(filter), m_project(project) {}
 
-        virtual relation_base * operator()(const relation_base & t1) {
+        relation_base * operator()(const relation_base & t1) override {
             TRACE("dl", tout << t1.get_plugin().get_name() << "\n";);
             scoped_rel<relation_base> aux = t1.clone();
             (*m_filter)(*aux);
@@ -823,7 +823,7 @@ namespace datalog {
         default_relation_intersection_filter_fn(relation_join_fn * join_fun, relation_union_fn * union_fun) 
             : m_join_fun(join_fun), m_union_fun(union_fun) {}
 
-        virtual void operator()(relation_base & tgt, const relation_base & intersected_obj) {
+        void operator()(relation_base & tgt, const relation_base & intersected_obj) override {
             scoped_rel<relation_base> filtered_rel = (*m_join_fun)(tgt, intersected_obj);
             TRACE("dl", 
                   tgt.display(tout << "tgt:\n"); 
@@ -926,7 +926,7 @@ namespace datalog {
             const unsigned * cols1, const unsigned * cols2) 
             : convenient_table_join_fn(t1_sig, t2_sig, col_cnt, cols1, cols2), m_col_cnt(col_cnt) {}
 
-        virtual table_base * operator()(const table_base & t1, const table_base & t2) {
+        table_base * operator()(const table_base & t1, const table_base & t2) override {
             table_plugin * plugin = &t1.get_plugin();
 
             const table_signature & res_sign = get_result_signature();
@@ -1037,15 +1037,15 @@ namespace datalog {
                 SASSERT(removed_col_cnt>0);
         }
 
-        virtual const table_signature & get_result_signature() const {
+        const table_signature & get_result_signature() const override {
             return convenient_table_project_fn::get_result_signature();
         }
 
-        virtual void modify_fact(table_fact & f) const {
+        void modify_fact(table_fact & f) const override {
             project_out_vector_columns(f, m_removed_cols);
         }
 
-        virtual table_base * operator()(const table_base & t) {
+        table_base * operator()(const table_base & t) override {
             return auxiliary_table_transformer_fn::operator()(t);
         }
     };
@@ -1054,7 +1054,7 @@ namespace datalog {
         const table_signature m_empty_sig;
     public:
         null_signature_table_project_fn() : m_empty_sig() {}
-        virtual table_base * operator()(const table_base & t) {
+        table_base * operator()(const table_base & t) override {
             relation_manager & m = t.get_plugin().get_manager();
             table_base * res = m.mk_empty_table(m_empty_sig);
             if(!t.empty()) {
@@ -1096,14 +1096,14 @@ namespace datalog {
             m_removed_cols(removed_col_cnt, removed_cols) {}
 
         class unreachable_reducer : public table_row_pair_reduce_fn {
-            virtual void operator()(table_element * func_columns, const table_element * merged_func_columns) {
+            void operator()(table_element * func_columns, const table_element * merged_func_columns) override {
                 //we do project_with_reduce only if we are sure there will be no reductions
                 //(see code of the table_signature::from_join_project function)
                 UNREACHABLE();
             }
         };
 
-        virtual table_base * operator()(const table_base & t1, const table_base & t2) {
+        table_base * operator()(const table_base & t1, const table_base & t2) override {
             table_base * aux = (*m_join)(t1, t2);
             if(m_project==0) {
                 relation_manager & rmgr = aux->get_plugin().get_manager();
@@ -1154,15 +1154,15 @@ namespace datalog {
             SASSERT(permutation_cycle_len>=2);
         }
 
-        virtual const table_signature & get_result_signature() const {
+        const table_signature & get_result_signature() const override {
             return convenient_table_rename_fn::get_result_signature();
         }
 
-        virtual void modify_fact(table_fact & f) const {
+        void modify_fact(table_fact & f) const override {
             permutate_by_cycle(f, m_cycle);
         }
 
-        virtual table_base * operator()(const table_base & t) {
+        table_base * operator()(const table_base & t) override {
             return auxiliary_table_transformer_fn::operator()(t);
         }
 
@@ -1190,7 +1190,7 @@ namespace datalog {
     class relation_manager::default_table_union_fn : public table_union_fn {
         table_fact m_row;
     public:
-        virtual void operator()(table_base & tgt, const table_base & src, table_base * delta) {
+        void operator()(table_base & tgt, const table_base & src, table_base * delta) override {
             table_base::iterator it = src.begin();
             table_base::iterator iend = src.end();
 
@@ -1283,7 +1283,7 @@ namespace datalog {
             SASSERT(col_cnt>=2);
         }
 
-        virtual bool should_remove(const table_fact & f) const {
+        bool should_remove(const table_fact & f) const override {
             table_element val=f[m_identical_cols[0]];
             for(unsigned i=1; i<m_col_cnt; i++) {
                 if(f[m_identical_cols[i]]!=val) {
@@ -1293,7 +1293,7 @@ namespace datalog {
             return false;
         }
 
-        virtual void operator()(table_base & t) {
+        void operator()(table_base & t) override {
             auxiliary_table_filter_fn::operator()(t);
         }
 
@@ -1318,11 +1318,11 @@ namespace datalog {
                 : m_value(value),
                 m_col(col) {}
 
-        virtual bool should_remove(const table_fact & f) const {
+        bool should_remove(const table_fact & f) const override {
             return f[m_col]!=m_value;
         }
 
-        virtual void operator()(table_base & t) {
+        void operator()(table_base & t) override {
             auxiliary_table_filter_fn::operator()(t);
         }
     };
@@ -1346,11 +1346,11 @@ namespace datalog {
               m_value(value) {
         }
 
-        virtual bool should_remove(const table_fact & f) const {
+        bool should_remove(const table_fact & f) const override {
             return f[m_column] == m_value;
         }
 
-        virtual void operator()(table_base & t) {
+        void operator()(table_base & t) override {
             auxiliary_table_filter_fn::operator()(t);
         }
 
@@ -1402,7 +1402,7 @@ namespace datalog {
             m_free_vars(m_condition);
         }
 
-        virtual bool should_remove(const table_fact & f) const {
+        bool should_remove(const table_fact & f) const override {
             expr_ref_vector& args = const_cast<expr_ref_vector&>(m_args);
 
             args.reset();
@@ -1425,7 +1425,7 @@ namespace datalog {
             return m_ast_manager.is_false(ground);
         }
 
-        virtual void operator()(table_base & t) {
+        void operator()(table_base & t) override {
             auxiliary_table_filter_fn::operator()(t);
         }
     };
@@ -1455,7 +1455,7 @@ namespace datalog {
                 : m_filter(filter), m_condition(condition, ctx.get_manager()),
                 m_removed_cols(removed_col_cnt, removed_cols) {}
 
-        virtual table_base* operator()(const table_base & tb) {
+        table_base* operator()(const table_base & tb) override {
             table_base *t2 = tb.clone();
             (*m_filter)(*t2);
             if (!m_project) {
@@ -1506,7 +1506,7 @@ namespace datalog {
             m_aux_fact.resize(neg_t.get_signature().size());
         }
 
-        virtual bool should_remove(const table_fact & f) const {
+        bool should_remove(const table_fact & f) const override {
             if(!m_all_neg_bound || m_overlap) {
                 table_base::iterator nit = m_negated_table->begin();
                 table_base::iterator nend = m_negated_table->end();
@@ -1524,7 +1524,7 @@ namespace datalog {
             }
         }
 
-        virtual void operator()(table_base & tgt, const table_base & negated_table) {
+        void operator()(table_base & tgt, const table_base & negated_table) override {
             SASSERT(m_negated_table==0);
             flet<const table_base *> flet_neg_table(m_negated_table, &negated_table);
             auxiliary_table_filter_fn::operator()(tgt);
@@ -1568,7 +1568,7 @@ namespace datalog {
         default_table_select_equal_and_project_fn(table_mutator_fn * filter, table_transformer_fn * project)
             : m_filter(filter), m_project(project) {}
 
-        virtual table_base * operator()(const table_base & t1) {
+        table_base * operator()(const table_base & t1) override {
             TRACE("dl", tout << t1.get_plugin().get_name() << "\n";);
             scoped_rel<table_base> aux = t1.clone();
             (*m_filter)(*aux);
@@ -1606,9 +1606,9 @@ namespace datalog {
             m_union_fn = plugin.mk_union_fn(t, *m_aux_table, static_cast<table_base *>(0));
         }
 
-        virtual ~default_table_map_fn() {}
+        ~default_table_map_fn() override {}
 
-        virtual void operator()(table_base & t) {
+        void operator()(table_base & t) override {
             SASSERT(t.get_signature()==m_aux_table->get_signature());
             if(!m_aux_table->empty()) {
                 m_aux_table->reset();
@@ -1664,7 +1664,7 @@ namespace datalog {
             m_former_row.resize(get_result_signature().size());
         }
 
-        virtual ~default_table_project_with_reduce_fn() {}
+        ~default_table_project_with_reduce_fn() override {}
 
         virtual void modify_fact(table_fact & f) const {
             unsigned ofs=1;
@@ -1693,7 +1693,7 @@ namespace datalog {
             }
         }
 
-        virtual table_base * operator()(const table_base & t) {
+        table_base * operator()(const table_base & t) override {
             table_plugin & plugin = t.get_plugin();
             const table_signature & res_sign = get_result_signature();
             SASSERT(plugin.can_handle_signature(res_sign));

src/muz/rel/dl_sieve_relation.cpp

@@ -294,7 +294,7 @@ namespace datalog {
             }
         }
 
-        virtual relation_base * operator()(const relation_base & r1, const relation_base & r2) {
+        relation_base * operator()(const relation_base & r1, const relation_base & r2) override {
             bool r1_sieved = r1.get_plugin().is_sieve_relation();
             bool r2_sieved = r2.get_plugin().is_sieve_relation();
             SASSERT(r1_sieved || r2_sieved);
@@ -357,7 +357,7 @@ namespace datalog {
             get_result_signature() = result_sig;
         }
 
-        virtual relation_base * operator()(const relation_base & r0) {
+        relation_base * operator()(const relation_base & r0) override {
             SASSERT(r0.get_plugin().is_sieve_relation());
             const sieve_relation & r = static_cast<const sieve_relation &>(r0);
             sieve_relation_plugin & plugin = r.get_plugin();
@@ -439,7 +439,7 @@ namespace datalog {
     public:
         union_fn(relation_union_fn * union_fun) : m_union_fun(union_fun) {}
 
-        virtual void operator()(relation_base & tgt, const relation_base & src, relation_base * delta) {
+        void operator()(relation_base & tgt, const relation_base & src, relation_base * delta) override {
             bool tgt_sieved = tgt.get_plugin().is_sieve_relation();
             bool src_sieved = src.get_plugin().is_sieve_relation();
             bool delta_sieved = delta && delta->get_plugin().is_sieve_relation();
@@ -504,7 +504,7 @@ namespace datalog {
         filter_fn(relation_mutator_fn * inner_fun) 
             : m_inner_fun(inner_fun) {}
 
-        virtual void operator()(relation_base & r0) {
+        void operator()(relation_base & r0) override {
             SASSERT(r0.get_plugin().is_sieve_relation());
             sieve_relation & r = static_cast<sieve_relation &>(r0);
 
@@ -600,7 +600,7 @@ namespace datalog {
         negation_filter_fn(relation_intersection_filter_fn * inner_fun)
             : m_inner_fun(inner_fun) {}
 
-        virtual void operator()(relation_base & r, const relation_base & neg) {
+        void operator()(relation_base & r, const relation_base & neg) override {
             bool r_sieved = r.get_plugin().is_sieve_relation();
             bool neg_sieved = neg.get_plugin().is_sieve_relation();
             SASSERT(r_sieved || neg_sieved);

src/muz/rel/dl_sieve_relation.h

@@ -85,7 +85,7 @@ namespace datalog {
 
         sieve_relation_plugin(relation_manager & manager);
 
-        virtual void initialize(family_id fid);
+        void initialize(family_id fid) override;
 
         family_id get_relation_kind(const relation_signature & sig, const bool * inner_columns, 
             family_id inner_kind);
@@ -95,15 +95,15 @@ namespace datalog {
             return get_relation_kind(sig, inner_columns.c_ptr(), inner_kind);
         }
 
-        virtual bool can_handle_signature(const relation_signature & s);
+        bool can_handle_signature(const relation_signature & s) override;
         
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
         sieve_relation * mk_empty(const sieve_relation & original);
-        virtual relation_base * mk_empty(const relation_base & original);
+        relation_base * mk_empty(const relation_base & original) override;
-        virtual relation_base * mk_empty(const relation_signature & s, family_id kind);
+        relation_base * mk_empty(const relation_signature & s, family_id kind) override;
         sieve_relation * mk_empty(const relation_signature & s, relation_plugin & inner_plugin);
 
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s);
+        relation_base * mk_full(func_decl* p, const relation_signature & s) override;
         sieve_relation * full(func_decl* p, const relation_signature & s, relation_plugin & inner_plugin);
 
         sieve_relation * mk_from_inner(const relation_signature & s, const bool * inner_columns, 
@@ -116,22 +116,22 @@ namespace datalog {
 
     protected:
 
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t, 
+        relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t,
             const relation_base & negated_obj, unsigned joined_col_cnt,
-            const unsigned * t_cols, const unsigned * negated_cols);
+            const unsigned * t_cols, const unsigned * negated_cols) override;
     };
 
 
@@ -176,18 +176,18 @@ namespace datalog {
         relation_base & get_inner() { return *m_inner; }
         const relation_base & get_inner() const { return *m_inner; }
 
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
-        virtual sieve_relation * clone() const;
+        sieve_relation * clone() const override;
-        virtual relation_base * complement(func_decl*p) const;
+        relation_base * complement(func_decl*p) const override;
-        virtual void to_formula(expr_ref& fml) const;
+        void to_formula(expr_ref& fml) const override;
 
-        virtual bool empty() const { return get_inner().empty(); }
+        bool empty() const override { return get_inner().empty(); }
-        virtual void reset() { get_inner().reset(); }
+        void reset() override { get_inner().reset(); }
-        virtual unsigned get_size_estimate_rows() const { return get_inner().get_size_estimate_rows(); }
+        unsigned get_size_estimate_rows() const override { return get_inner().get_size_estimate_rows(); }
-        virtual unsigned get_size_estimate_bytes() const { return get_inner().get_size_estimate_bytes(); }
+        unsigned get_size_estimate_bytes() const override { return get_inner().get_size_estimate_bytes(); }
 
-        virtual void display(std::ostream & out) const;
+        void display(std::ostream & out) const override;
     };
 
 

src/muz/rel/dl_sparse_table.cpp

@@ -198,7 +198,7 @@ namespace datalog {
               row_interface(t), 
               m_parent(parent) {}
 
-            virtual table_element operator[](unsigned col) const {
+            table_element operator[](unsigned col) const override {
                 return m_parent.m_layout.get(m_parent.m_ptr, col);
             }
 
@@ -218,15 +218,15 @@ namespace datalog {
           m_row_obj(t, *this),
           m_layout(t.m_column_layout) {}
 
-        virtual bool is_finished() const {
+        bool is_finished() const override {
             return m_ptr == m_end;
         }
 
-        virtual row_interface & operator*() {
+        row_interface & operator*() override {
             SASSERT(!is_finished());
             return m_row_obj;
         }
-        virtual void operator++() {
+        void operator++() override {
             SASSERT(!is_finished());
             m_ptr+=m_fact_size;
         }
@@ -312,7 +312,7 @@ namespace datalog {
             m_keys(key_len*sizeof(table_element)), 
             m_first_nonindexed(0) {}
 
-        virtual void update(const sparse_table & t) {
+        void update(const sparse_table & t) override {
             if (m_first_nonindexed == t.m_data.after_last_offset()) {
                 return;
             }
@@ -351,7 +351,7 @@ namespace datalog {
             m_first_nonindexed = t.m_data.after_last_offset();
         }
 
-        virtual query_result get_matching_offsets(const key_value & key) const {
+        query_result get_matching_offsets(const key_value & key) const override {
             key_to_reserve(key);
             store_offset ofs;
             if (!m_keys.find_reserve_content(ofs)) {
@@ -406,9 +406,9 @@ namespace datalog {
             m_key_fact.resize(t.get_signature().size());
         }
 
-        virtual ~full_signature_key_indexer() {}
+        ~full_signature_key_indexer() override {}
 
-        virtual query_result get_matching_offsets(const key_value & key) const {
+        query_result get_matching_offsets(const key_value & key) const override {
             unsigned key_len = m_key_cols.size();
             for (unsigned i=0; i<key_len; i++) {
                 m_key_fact[m_permutation[i]] = key[i];
@@ -826,7 +826,7 @@ namespace datalog {
             m_removed_cols.push_back(UINT_MAX);
         }
 
-        virtual table_base * operator()(const table_base & tb1, const table_base & tb2) {
+        table_base * operator()(const table_base & tb1, const table_base & tb2) override {
 
             const sparse_table & t1 = get(tb1);
             const sparse_table & t2 = get(tb2);
@@ -882,7 +882,7 @@ namespace datalog {
 
     class sparse_table_plugin::union_fn : public table_union_fn {
     public:
-        virtual void operator()(table_base & tgt0, const table_base & src0, table_base * delta0) {
+        void operator()(table_base & tgt0, const table_base & src0, table_base * delta0) override {
             verbose_action  _va("union");
             sparse_table & tgt = get(tgt0);
             const sparse_table & src = get(src0);
@@ -941,7 +941,7 @@ namespace datalog {
                 SASSERT(r_idx == m_removed_col_cnt);
         }
 
-        virtual table_base * operator()(const table_base & tb) {
+        table_base * operator()(const table_base & tb) override {
             verbose_action  _va("project");
             const sparse_table & t = get(tb);
 
@@ -985,7 +985,7 @@ namespace datalog {
             m_key.push_back(val);
         }
 
-        virtual table_base * operator()(const table_base & tb) {
+        table_base * operator()(const table_base & tb) override {
             verbose_action  _va("select_equal_and_project");
             const sparse_table & t = get(tb);
 
@@ -1072,7 +1072,7 @@ namespace datalog {
                 }
         }
 
-        virtual table_base * operator()(const table_base & tb) {
+        table_base * operator()(const table_base & tb) override {
             verbose_action  _va("rename");
 
             const sparse_table & t = get(tb);
@@ -1210,7 +1210,7 @@ namespace datalog {
             }
         }
 
-        virtual void operator()(table_base & tgt0, const table_base & neg0) {
+        void operator()(table_base & tgt0, const table_base & neg0) override {
             sparse_table & tgt = get(tgt0);
             const sparse_table & neg = get(neg0);
            
@@ -1310,7 +1310,7 @@ namespace datalog {
             m_s2_cols.append(src2_cols);
         }
 
-        virtual void operator()(table_base & _t, const table_base & _s1, const table_base& _s2) {
+        void operator()(table_base & _t, const table_base & _s1, const table_base& _s2) override {
 
             verbose_action  _va("negated_join");
             sparse_table& t = get(_t);

src/muz/rel/dl_sparse_table.h

@@ -69,39 +69,39 @@ namespace datalog {
         typedef sparse_table table;
 
         sparse_table_plugin(relation_manager & manager);
-        ~sparse_table_plugin();
+        ~sparse_table_plugin() override;
 
-        virtual bool can_handle_signature(const table_signature & s) 
+        bool can_handle_signature(const table_signature & s) override
         { return s.size()>0; }
 
-        virtual table_base * mk_empty(const table_signature & s);
+        table_base * mk_empty(const table_signature & s) override;
         sparse_table * mk_clone(const sparse_table & t);
 
     protected:
-        virtual table_join_fn * mk_join_fn(const table_base & t1, const table_base & t2,
+        table_join_fn * mk_join_fn(const table_base & t1, const table_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual table_join_fn * mk_join_project_fn(const table_base & t1, const table_base & t2,
+        table_join_fn * mk_join_project_fn(const table_base & t1, const table_base & t2,
             unsigned col_cnt, const unsigned * cols1, const unsigned * cols2, unsigned removed_col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual table_union_fn * mk_union_fn(const table_base & tgt, const table_base & src, 
+        table_union_fn * mk_union_fn(const table_base & tgt, const table_base & src,
-            const table_base * delta);
+            const table_base * delta) override;
-        virtual table_transformer_fn * mk_project_fn(const table_base & t, unsigned col_cnt, 
+        table_transformer_fn * mk_project_fn(const table_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual table_transformer_fn * mk_rename_fn(const table_base & t, unsigned permutation_cycle_len,
+        table_transformer_fn * mk_rename_fn(const table_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual table_transformer_fn * mk_select_equal_and_project_fn(const table_base & t, 
+        table_transformer_fn * mk_select_equal_and_project_fn(const table_base & t,
-            const table_element & value, unsigned col);
+            const table_element & value, unsigned col) override;
-        virtual table_intersection_filter_fn * mk_filter_by_negation_fn(const table_base & t, 
+        table_intersection_filter_fn * mk_filter_by_negation_fn(const table_base & t,
                 const table_base & negated_obj, unsigned joined_col_cnt,
-                const unsigned * t_cols, const unsigned * negated_cols);
+                const unsigned * t_cols, const unsigned * negated_cols) override;
-        virtual table_intersection_join_filter_fn* mk_filter_by_negated_join_fn(
+        table_intersection_join_filter_fn* mk_filter_by_negated_join_fn(
             const table_base & t,
             const table_base & src1,
             const table_base & src2,
             unsigned_vector const& t_cols,
             unsigned_vector const& src_cols,
             unsigned_vector const& src1_cols,
-            unsigned_vector const& src2_cols);
+            unsigned_vector const& src2_cols) override;
 
         static sparse_table const& get(table_base const&);
         static sparse_table& get(table_base&);
@@ -463,10 +463,10 @@ namespace datalog {
 
         sparse_table(sparse_table_plugin & p, const table_signature & sig, unsigned init_capacity=0);
         sparse_table(const sparse_table & t);
-        virtual ~sparse_table();
+        ~sparse_table() override;
     public:
 
-        virtual void deallocate() {
+        void deallocate() override {
             get_plugin().recycle(this);
         }
 
@@ -475,22 +475,22 @@ namespace datalog {
         sparse_table_plugin & get_plugin() const 
         { return static_cast<sparse_table_plugin &>(table_base::get_plugin()); }
 
-        virtual bool empty() const { return row_count()==0; }
+        bool empty() const override { return row_count()==0; }
-        virtual void add_fact(const table_fact & f);
+        void add_fact(const table_fact & f) override;
-        virtual bool contains_fact(const table_fact & f) const;
+        bool contains_fact(const table_fact & f) const override;
-        virtual bool fetch_fact(table_fact & f) const;
+        bool fetch_fact(table_fact & f) const override;
-        virtual void ensure_fact(const table_fact & f);
+        void ensure_fact(const table_fact & f) override;
-        virtual void remove_fact(const table_element* fact);
+        void remove_fact(const table_element* fact) override;
-        virtual void reset();
+        void reset() override;
 
-        virtual table_base * clone() const;
+        table_base * clone() const override;
 
-        virtual table_base::iterator begin() const;
+        table_base::iterator begin() const override;
-        virtual table_base::iterator end() const;
+        table_base::iterator end() const override;
 
-        virtual unsigned get_size_estimate_rows() const { return row_count(); }
+        unsigned get_size_estimate_rows() const override { return row_count(); }
-        virtual unsigned get_size_estimate_bytes() const;
+        unsigned get_size_estimate_bytes() const override;
-        virtual bool knows_exact_size() const { return true; }
+        bool knows_exact_size() const override { return true; }
     };
 
  };

src/muz/rel/dl_table.cpp

@@ -43,7 +43,7 @@ namespace datalog {
             : convenient_table_join_fn(t1_sig, t2_sig, col_cnt, cols1, cols2),
             m_joined_col_cnt(col_cnt) {}
 
-        virtual table_base * operator()(const table_base & t1, const table_base & t2) {
+        table_base * operator()(const table_base & t1, const table_base & t2) override {
 
             const hashtable_table & ht1 = static_cast<const hashtable_table &>(t1);
             const hashtable_table & ht2 = static_cast<const hashtable_table &>(t2);
@@ -105,10 +105,10 @@ namespace datalog {
         public:
             our_row(const our_iterator_core & parent) : row_interface(parent.m_parent), m_parent(parent) {}
 
-            virtual void get_fact(table_fact & result) const {
+            void get_fact(table_fact & result) const override {
                 result = *m_parent.m_inner;
             }
-            virtual table_element operator[](unsigned col) const {
+            table_element operator[](unsigned col) const override {
                 return (*m_parent.m_inner)[col];
             }
 
@@ -121,15 +121,15 @@ namespace datalog {
             m_parent(t), m_inner(finished ? t.m_data.end() : t.m_data.begin()), 
             m_end(t.m_data.end()), m_row_obj(*this) {}
 
-        virtual bool is_finished() const {
+        bool is_finished() const override {
             return m_inner==m_end;
         }
 
-        virtual row_interface & operator*() {
+        row_interface & operator*() override {
             SASSERT(!is_finished());
             return m_row_obj;
         }
-        virtual void operator++() {
+        void operator++() override {
             SASSERT(!is_finished());
             ++m_inner;
         }
@@ -192,7 +192,7 @@ namespace datalog {
             const bv_iterator& m_parent;
         public:
             our_row(const bv_iterator & p) : caching_row_interface(p.m_bv), m_parent(p) {}
-            virtual void get_fact(table_fact& result) const {
+            void get_fact(table_fact& result) const override {
                 if (result.size() < size()) {
                     result.resize(size(), 0);
                 }
@@ -210,15 +210,15 @@ namespace datalog {
             }
         }
 
-        virtual bool is_finished() const {
+        bool is_finished() const override {
             return m_offset == m_bv.m_bv.size();
         }
 
-        virtual row_interface & operator*() {
+        row_interface & operator*() override {
             SASSERT(!is_finished());
             return m_row_obj;
         }
-        virtual void operator++() {
+        void operator++() override {
             SASSERT(!is_finished());
             ++m_offset;
             while (!is_finished() && !m_bv.m_bv.get(m_offset)) {

src/muz/rel/dl_table.h

@@ -61,10 +61,10 @@ namespace datalog {
         hashtable_table_plugin(relation_manager & manager) 
             : table_plugin(symbol("hashtable"), manager) {}
 
-        virtual table_base * mk_empty(const table_signature & s);
+        table_base * mk_empty(const table_signature & s) override;
 
-        virtual table_join_fn * mk_join_fn(const table_base & t1, const table_base & t2,
+        table_join_fn * mk_join_fn(const table_base & t1, const table_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
     };
 
     class hashtable_table : public table_base {
@@ -84,23 +84,23 @@ namespace datalog {
         hashtable_table_plugin & get_plugin() const
         { return static_cast<hashtable_table_plugin &>(table_base::get_plugin()); }
 
-        virtual void add_fact(const table_fact & f) {
+        void add_fact(const table_fact & f) override {
             m_data.insert(f);
         }
-        virtual void remove_fact(const table_element* fact) {
+        void remove_fact(const table_element* fact) override {
             table_fact f(get_signature().size(), fact);
             m_data.remove(f);
         }
-        virtual bool contains_fact(const table_fact & f) const {
+        bool contains_fact(const table_fact & f) const override {
             return m_data.contains(f);
         }
 
-        virtual iterator begin() const;
+        iterator begin() const override;
-        virtual iterator end() const;
+        iterator end() const override;
 
-        virtual unsigned get_size_estimate_rows() const { return m_data.size(); }
+        unsigned get_size_estimate_rows() const override { return m_data.size(); }
-        virtual unsigned get_size_estimate_bytes() const { return m_data.size()*get_signature().size()*8; }
+        unsigned get_size_estimate_bytes() const override { return m_data.size()*get_signature().size()*8; }
-        virtual bool knows_exact_size() const { return true; }
+        bool knows_exact_size() const override { return true; }
     };
 
     // -----------------------------------
@@ -118,9 +118,9 @@ namespace datalog {
         bitvector_table_plugin(relation_manager & manager) 
             : table_plugin(symbol("bitvector"), manager) {}
 
-        virtual bool can_handle_signature(const table_signature & s);
+        bool can_handle_signature(const table_signature & s) override;
 
-        virtual table_base * mk_empty(const table_signature & s);
+        table_base * mk_empty(const table_signature & s) override;
     };
 
     class bitvector_table : public table_base {
@@ -137,11 +137,11 @@ namespace datalog {
 
         bitvector_table(bitvector_table_plugin & plugin, const table_signature & sig);
     public:
-        virtual void add_fact(const table_fact & f);
+        void add_fact(const table_fact & f) override;
-        virtual void remove_fact(const table_element* fact);                   
+        void remove_fact(const table_element* fact) override;
-        virtual bool contains_fact(const table_fact & f) const;
+        bool contains_fact(const table_fact & f) const override;
-        virtual iterator begin() const;
+        iterator begin() const override;
-        virtual iterator end() const;
+        iterator end() const override;
     };
 
 

src/muz/rel/dl_table_relation.cpp

@@ -82,7 +82,7 @@ namespace datalog {
             : convenient_relation_join_project_fn(s1, s2, col_cnt, cols1, cols2, removed_col_cnt,
                     removed_cols), m_tfun(tfun) {}
         
-        virtual relation_base * operator()(const relation_base & t1, const relation_base & t2) {
+        relation_base * operator()(const relation_base & t1, const relation_base & t2) override {
             SASSERT(t1.from_table());
             SASSERT(t2.from_table());
             table_relation_plugin & plugin = static_cast<table_relation_plugin &>(t1.get_plugin());
@@ -146,7 +146,7 @@ namespace datalog {
         tr_transformer_fn(const relation_signature & rsig, table_transformer_fn * tfun) 
             : m_tfun(tfun) { get_result_signature() = rsig; }
 
-        virtual relation_base * operator()(const relation_base & t) {
+        relation_base * operator()(const relation_base & t) override {
             SASSERT(t.from_table());
             table_relation_plugin & plugin = static_cast<table_relation_plugin &>(t.get_plugin());
 
@@ -235,7 +235,7 @@ namespace datalog {
        by iterating through the table and calling \c add_fact of the target relation.
     */
     class table_relation_plugin::universal_target_union_fn : public relation_union_fn {
-        virtual void operator()(relation_base & tgt, const relation_base & src, relation_base * delta) {
+        void operator()(relation_base & tgt, const relation_base & src, relation_base * delta) override {
             SASSERT(src.from_table());
 
             const table_relation & tr_src = static_cast<const table_relation &>(src);
@@ -271,7 +271,7 @@ namespace datalog {
     public:
         tr_union_fn(table_union_fn * tfun) : m_tfun(tfun) {}
 
-        virtual void operator()(relation_base & tgt, const relation_base & src, relation_base * delta) {
+        void operator()(relation_base & tgt, const relation_base & src, relation_base * delta) override {
             SASSERT(tgt.from_table());
             SASSERT(src.from_table());
             SASSERT(!delta || delta->from_table());
@@ -311,7 +311,7 @@ namespace datalog {
     public:
         tr_mutator_fn(table_mutator_fn * tfun) : m_tfun(tfun) {}
 
-        virtual void operator()(relation_base & r) {
+        void operator()(relation_base & r) override {
             SASSERT(r.from_table());
             table_relation & tr = static_cast<table_relation &>(r);            
             (*m_tfun)(tr.get_table());
@@ -377,7 +377,7 @@ namespace datalog {
     public:
         tr_intersection_filter_fn(table_intersection_filter_fn * tfun) : m_tfun(tfun) {}
 
-        virtual void operator()(relation_base & r, const relation_base & src) {
+        void operator()(relation_base & r, const relation_base & src) override {
             SASSERT(r.from_table()); 
             SASSERT(src.from_table());
 

src/muz/rel/dl_table_relation.h

@@ -46,40 +46,40 @@ namespace datalog {
 
         table_plugin & get_table_plugin() { return m_table_plugin; }
 
-        virtual bool can_handle_signature(const relation_signature & s);
+        bool can_handle_signature(const relation_signature & s) override;
         
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
         virtual relation_base * mk_full_relation(const relation_signature & s, func_decl* p, family_id kind);
         relation_base * mk_from_table(const relation_signature & s, table_base * t);
 
     protected:
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_join_fn * mk_join_project_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_project_fn(const relation_base & t1, const relation_base & t2,
             unsigned joined_col_cnt, const unsigned * cols1, const unsigned * cols2, unsigned removed_col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_transformer_fn * mk_permutation_rename_fn(const relation_base & t, 
+        relation_transformer_fn * mk_permutation_rename_fn(const relation_base & t,
-            const unsigned * permutation);
+            const unsigned * permutation) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
-        virtual relation_transformer_fn * mk_filter_interpreted_and_project_fn(const relation_base & t,
+        relation_transformer_fn * mk_filter_interpreted_and_project_fn(const relation_base & t,
-            app * condition, unsigned removed_col_cnt, const unsigned * removed_cols);
+            app * condition, unsigned removed_col_cnt, const unsigned * removed_cols) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_intersection_fn(const relation_base & t, 
+        relation_intersection_filter_fn * mk_filter_by_intersection_fn(const relation_base & t,
-            const relation_base & src, unsigned joined_col_cnt, const unsigned * t_cols, const unsigned * src_cols);
+            const relation_base & src, unsigned joined_col_cnt, const unsigned * t_cols, const unsigned * src_cols) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t, 
+        relation_intersection_filter_fn * mk_filter_by_negation_fn(const relation_base & t,
             const relation_base & negated_obj, unsigned joined_col_cnt,
-            const unsigned * t_cols, const unsigned * negated_cols);
+            const unsigned * t_cols, const unsigned * negated_cols) override;
-        virtual relation_transformer_fn * mk_select_equal_and_project_fn(const relation_base & t, 
+        relation_transformer_fn * mk_select_equal_and_project_fn(const relation_base & t,
-            const relation_element & value, unsigned col);
+            const relation_element & value, unsigned col) override;
     };
 
     class table_relation : public relation_base {
@@ -107,24 +107,24 @@ namespace datalog {
         table_base & get_table() { return *m_table; }
         const table_base & get_table() const { return *m_table; }
 
-        virtual bool empty() const { return m_table->empty(); }
+        bool empty() const override { return m_table->empty(); }
 
         void add_table_fact(const table_fact & f);
 
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
-        virtual relation_base * clone() const;
+        relation_base * clone() const override;
-        virtual relation_base * complement(func_decl* p) const;
+        relation_base * complement(func_decl* p) const override;
-        virtual void to_formula(expr_ref& fml) const { get_table().to_formula(get_signature(), fml); }
+        void to_formula(expr_ref& fml) const override { get_table().to_formula(get_signature(), fml); }
 
-        virtual void display(std::ostream & out) const {
+        void display(std::ostream & out) const override {
             get_table().display(out);
         }
-        virtual void display_tuples(func_decl & pred, std::ostream & out) const;
+        void display_tuples(func_decl & pred, std::ostream & out) const override;
 
-        virtual unsigned get_size_estimate_rows() const { return m_table->get_size_estimate_rows(); }
+        unsigned get_size_estimate_rows() const override { return m_table->get_size_estimate_rows(); }
-        virtual unsigned get_size_estimate_bytes() const { return m_table->get_size_estimate_bytes(); }
+        unsigned get_size_estimate_bytes() const override { return m_table->get_size_estimate_bytes(); }
-        virtual bool knows_exact_size() const { return m_table->knows_exact_size(); }
+        bool knows_exact_size() const override { return m_table->knows_exact_size(); }
     };
 
 };

src/muz/rel/dl_vector_relation.h

@@ -55,12 +55,12 @@ namespace datalog {
             }
         }
 
-        virtual ~vector_relation() {
+        ~vector_relation() override {
             dealloc(m_eqs);
             dealloc(m_elems);
         }
 
-        virtual void swap(relation_base& other) {
+        void swap(relation_base& other) override {
             vector_relation& o = dynamic_cast<vector_relation&>(other);
             if (&o == this) return;
             std::swap(o.m_eqs, m_eqs);
@@ -85,7 +85,7 @@ namespace datalog {
         }
 
 
-        virtual bool empty() const { return m_empty; }
+        bool empty() const override { return m_empty; }
 
         T& operator[](unsigned i) { return (*m_elems)[find(i)]; }
 
@@ -93,7 +93,7 @@ namespace datalog {
 
         virtual void display_index(unsigned i, T const& t, std::ostream& out) const = 0;
 
-        virtual void display(std::ostream & out) const {
+        void display(std::ostream & out) const override {
             if (empty()) {
                 out << "empty\n";
                 return;

src/muz/rel/karr_relation.cpp

@@ -36,13 +36,13 @@ namespace datalog {
         {
         }
 
-        virtual bool empty() const { 
+        bool empty() const override {
             return m_empty;
         }
 
-        virtual bool is_precise() const { return false; }
+        bool is_precise() const override { return false; }
 
-        virtual void add_fact(const relation_fact & f) {
+        void add_fact(const relation_fact & f) override {
             SASSERT(m_empty);
             SASSERT(!m_basis_valid);
             m_empty = false;
@@ -60,12 +60,12 @@ namespace datalog {
             }
         }
 
-        virtual bool contains_fact(const relation_fact & f) const {            
+        bool contains_fact(const relation_fact & f) const override {
             UNREACHABLE();
             return false;
         }
 
-        virtual void display(std::ostream & out) const {
+        void display(std::ostream & out) const override {
             if (m_fn) {
                 out << m_fn->get_name() << "\n";
             }
@@ -82,18 +82,18 @@ namespace datalog {
             }
         }
 
-        virtual karr_relation * clone() const {
+        karr_relation * clone() const override {
             karr_relation* result = alloc(karr_relation, m_plugin, m_fn, get_signature(), m_empty);
             result->copy(*this);
             return result;
         }
 
-        virtual karr_relation * complement(func_decl*) const {
+        karr_relation * complement(func_decl*) const override {
             UNREACHABLE();
             return 0;
         }
 
-        virtual void to_formula(expr_ref& fml) const {
+        void to_formula(expr_ref& fml) const override {
             if (empty()) {
                 fml = m.mk_false();
             }
@@ -514,7 +514,7 @@ namespace datalog {
             : convenient_relation_join_fn(o1_sig, o2_sig, col_cnt, cols1, cols2){
         }
         
-        virtual relation_base * operator()(const relation_base & _r1, const relation_base & _r2) {
+        relation_base * operator()(const relation_base & _r1, const relation_base & _r2) override {
             karr_relation const& r1 = get(_r1);
             karr_relation const& r2 = get(_r2);
             karr_relation_plugin& p = r1.get_plugin();
@@ -540,7 +540,7 @@ namespace datalog {
             : convenient_relation_project_fn(orig_sig, removed_col_cnt, removed_cols) {
         }
 
-        virtual relation_base * operator()(const relation_base & _r) {
+        relation_base * operator()(const relation_base & _r) override {
             karr_relation const& r = get(_r);
             karr_relation_plugin& p = r.get_plugin();
             karr_relation* result = dynamic_cast<karr_relation*>(p.mk_full(0, get_result_signature()));            
@@ -559,7 +559,7 @@ namespace datalog {
         rename_fn(karr_relation_plugin& p, const relation_signature & orig_sig, unsigned cycle_len, const unsigned * cycle) 
             : convenient_relation_rename_fn(orig_sig, cycle_len, cycle) {}
 
-        virtual relation_base * operator()(const relation_base & _r) {
+        relation_base * operator()(const relation_base & _r) override {
             karr_relation const& r = get(_r);
             karr_relation_plugin& p = r.get_plugin();
             karr_relation* result = dynamic_cast<karr_relation*>(p.mk_full(0, get_result_signature()));
@@ -676,7 +676,7 @@ namespace datalog {
     public:
         union_fn() {}
 
-        virtual void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) {
+        void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) override {
 
             karr_relation& r = get(_r);
             karr_relation const& src = get(_src);
@@ -707,7 +707,7 @@ namespace datalog {
         filter_identical_fn(unsigned col_cnt, const unsigned * identical_cols) 
             : m_identical_cols(col_cnt, identical_cols) {}
 
-        virtual void operator()(relation_base & _r) {
+        void operator()(relation_base & _r) override {
             karr_relation & r = get(_r);
             TRACE("dl", r.display(tout << "src:\n"););
             r.get_ineqs();
@@ -747,7 +747,7 @@ namespace datalog {
             m_valid = arith.is_numeral(value, m_value) && m_value.is_int();
         }
 
-        virtual void operator()(relation_base & _r) {
+        void operator()(relation_base & _r) override {
             karr_relation & r = get(_r);
             if (m_valid) {
                 r.get_ineqs();
@@ -779,7 +779,7 @@ namespace datalog {
             m_cond(cond, t.get_plugin().get_ast_manager()) {
         }
 
-        void operator()(relation_base& t) {
+        void operator()(relation_base& t) override {
             get(t).filter_interpreted(m_cond);
             TRACE("dl", tout << mk_pp(m_cond, m_cond.get_manager()) << "\n"; t.display(tout););
         }

src/muz/rel/karr_relation.h

@@ -45,33 +45,33 @@ namespace datalog {
             a(get_ast_manager())
         {}            
         
-        virtual bool can_handle_signature(const relation_signature & sig) {
+        bool can_handle_signature(const relation_signature & sig) override {
             return get_manager().get_context().karr();
         }
 
         static symbol get_name() { return symbol("karr_relation"); }
 
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
 
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s);
+        relation_base * mk_full(func_decl* p, const relation_signature & s) override;
 
         static karr_relation& get(relation_base& r);
         static karr_relation const & get(relation_base const& r);   
 
-        virtual relation_join_fn * mk_join_fn(
+        relation_join_fn * mk_join_fn(
             const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
 
     private:
         bool dualizeI(matrix& dst, matrix const& src);

src/muz/rel/rel_context.h

@@ -56,72 +56,72 @@ namespace datalog {
     public:
         rel_context(context& ctx);
 
-        virtual ~rel_context();
+        ~rel_context() override;
 
-        virtual relation_manager & get_rmanager();
+        relation_manager & get_rmanager() override;
-        virtual const relation_manager & get_rmanager() const;
+        const relation_manager & get_rmanager() const override;
         ast_manager& get_manager() const { return m; }
         context&     get_context() const { return m_context; }
-        virtual relation_base & get_relation(func_decl * pred); 
+        relation_base & get_relation(func_decl * pred) override;
-        virtual relation_base * try_get_relation(func_decl * pred) const; 
+        relation_base * try_get_relation(func_decl * pred) const override;
-        virtual bool is_empty_relation(func_decl* pred) const;
+        bool is_empty_relation(func_decl* pred) const override;
-        virtual expr_ref try_get_formula(func_decl * pred) const;
+        expr_ref try_get_formula(func_decl * pred) const override;
-        virtual expr_ref get_answer() { return m_answer; }
+        expr_ref get_answer() override { return m_answer; }
 
-        virtual bool output_profile() const;
+        bool output_profile() const override;
 
-        virtual lbool query(expr* q);
+        lbool query(expr* q) override;
-        virtual lbool query(unsigned num_rels, func_decl * const* rels);
+        lbool query(unsigned num_rels, func_decl * const* rels) override;
 
-        virtual void set_predicate_representation(func_decl * pred, unsigned relation_name_cnt, 
+        void set_predicate_representation(func_decl * pred, unsigned relation_name_cnt, 
-                                          symbol const * relation_names);
+                                          symbol const * relation_names) override;
         
-        virtual void inherit_predicate_kind(func_decl* new_pred, func_decl* orig_pred);
+        void inherit_predicate_kind(func_decl* new_pred, func_decl* orig_pred) override;
 
-        virtual void collect_statistics(statistics& st) const;
+        void collect_statistics(statistics& st) const override;
 
-        virtual void updt_params();
+        void updt_params() override;
 
         /**
            \brief Restrict the set of used predicates to \c res.
 
            The function deallocates unsused relations, it does not deal with rules.
          */
-        virtual void restrict_predicates(func_decl_set const& predicates);
+        void restrict_predicates(func_decl_set const& predicates) override;
 
-        virtual void transform_rules();
+        void transform_rules() override;
 
-        virtual bool try_get_size(func_decl* pred, unsigned& rel_size) const;
+        bool try_get_size(func_decl* pred, unsigned& rel_size) const override;
         /**
            \brief query result if it contains fact.
          */
-        virtual bool result_contains_fact(relation_fact const& f);
+        bool result_contains_fact(relation_fact const& f) override;
 
-        virtual void collect_non_empty_predicates(func_decl_set& ps) {
+        void collect_non_empty_predicates(func_decl_set& ps) override {
             return get_rmanager().collect_non_empty_predicates(ps);
         }
 
         /** \brief add facts to relation
         */
-        virtual void add_fact(func_decl* pred, relation_fact const& fact);
+        void add_fact(func_decl* pred, relation_fact const& fact) override;
-        virtual void add_fact(func_decl* pred, table_fact const& fact);
+        void add_fact(func_decl* pred, table_fact const& fact) override;
 
         /** \brief check if facts were added to relation
         */
-        virtual bool has_facts(func_decl * pred) const;
+        bool has_facts(func_decl * pred) const override;
         
         /**
            \brief Store the relation \c rel under the predicate \c pred. The \c context object
            takes over the ownership of the relation object.
         */
-        virtual void store_relation(func_decl * pred, relation_base * rel);
+        void store_relation(func_decl * pred, relation_base * rel) override;
 
-        virtual void display_output_facts(rule_set const& rules, std::ostream & out) const;
+        void display_output_facts(rule_set const& rules, std::ostream & out) const override;
-        virtual void display_facts(std::ostream & out) const;
+        void display_facts(std::ostream & out) const override;
 
-        virtual void display_profile(std::ostream& out);
+        void display_profile(std::ostream& out) override;
 
-        virtual lbool saturate();
+        lbool saturate() override;
 
     };
 };

src/muz/rel/udoc_relation.cpp

@@ -328,7 +328,7 @@ namespace datalog {
             t2.expand_column_vector(m_cols2);
         }
 
-        virtual relation_base * operator()(const relation_base & _r1, const relation_base & _r2) {
+        relation_base * operator()(const relation_base & _r1, const relation_base & _r2) override {
             udoc_relation const& r1 = get(_r1);
             udoc_relation const& r2 = get(_r2);
             TRACE("doc", r1.display(tout << "r1:\n"); r2.display(tout  << "r2:\n"););
@@ -369,7 +369,7 @@ namespace datalog {
             }
         }
 
-        virtual relation_base * operator()(const relation_base & tb) {
+        relation_base * operator()(const relation_base & tb) override {
             TRACE("doc", tb.display(tout << "src:\n"););
             udoc_relation const& t = get(tb);
             udoc_plugin& p = t.get_plugin();
@@ -462,7 +462,7 @@ namespace datalog {
             }
         }
 
-        virtual relation_base * operator()(const relation_base & _r) {
+        relation_base * operator()(const relation_base & _r) override {
             udoc_relation const& r = get(_r);
             TRACE("doc", r.display(tout << "r:\n"););
             udoc_plugin& p = r.get_plugin();            
@@ -494,7 +494,7 @@ namespace datalog {
     public:
         union_fn() {}
 
-        virtual void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) {
+        void operator()(relation_base & _r, const relation_base & _src, relation_base * _delta) override {
             TRACE("doc", _r.display(tout << "dst:\n"); _src.display(tout  << "src:\n"););
             udoc_relation& r = get(_r);
             udoc_relation const& src = get(_src);
@@ -574,7 +574,7 @@ namespace datalog {
             }
         }
         
-        virtual void operator()(relation_base & _r) {
+        void operator()(relation_base & _r) override {
             udoc_relation& r = get(_r);
             udoc& d = r.get_udoc();
             doc_manager& dm = r.get_dm();
@@ -602,10 +602,10 @@ namespace datalog {
             SASSERT(num_bits == hi - lo);
             dm.tbvm().set(m_filter->pos(), r, hi-1, lo);
         }
-        virtual ~filter_equal_fn() {
+        ~filter_equal_fn() override {
             dm.deallocate(m_filter);
         }        
-        virtual void operator()(relation_base & tb) {
+        void operator()(relation_base & tb) override {
             udoc_relation & t = get(tb);
             t.get_udoc().intersect(dm, *m_filter);
             SASSERT(t.get_udoc().well_formed(t.get_dm()));
@@ -932,11 +932,11 @@ namespace datalog {
                   m_udoc.display(dm, tout) << "\n";);
         }
 
-        virtual ~filter_interpreted_fn() {
+        ~filter_interpreted_fn() override {
             m_udoc.reset(dm);
         }
         
-        virtual void operator()(relation_base & tb) {            
+        void operator()(relation_base & tb) override {
             udoc_relation & t = get(tb);
             udoc& u = t.get_udoc();
             SASSERT(u.well_formed(dm));
@@ -987,7 +987,7 @@ namespace datalog {
 
 
         // TBD: replace this by "join" given below.
-        virtual relation_base* operator()(relation_base const& t1, relation_base const& t2) {
+        relation_base* operator()(relation_base const& t1, relation_base const& t2) override {
 #if 1
             return join(get(t1), get(t2));
 #else
@@ -1043,7 +1043,7 @@ namespace datalog {
     public:
       join_project_and_fn() {}
 
-      virtual relation_base* operator()(relation_base const& t1, relation_base const& t2) {
+      relation_base* operator()(relation_base const& t1, relation_base const& t2) override {
           udoc_relation *result = get(t1.clone());
           result->get_udoc().intersect(result->get_dm(), get(t2).get_udoc());
           return result;
@@ -1121,7 +1121,7 @@ namespace datalog {
             neg.expand_column_vector(m_neg_cols);
         }
         
-        virtual void operator()(relation_base& tb, const relation_base& negb) {
+        void operator()(relation_base& tb, const relation_base& negb) override {
             udoc_relation& t = get(tb);
             udoc_relation const& n = get(negb);
             IF_VERBOSE(3, t.display(verbose_stream() << "dst:"););
@@ -1223,10 +1223,10 @@ namespace datalog {
             t.compile_guard(guard, m_udoc, m_to_delete);
         }
         
-        virtual ~filter_proj_fn() {
+        ~filter_proj_fn() override {
             m_udoc.reset(dm);
         }
-        virtual relation_base* operator()(const relation_base & tb) {
+        relation_base* operator()(const relation_base & tb) override {
             udoc_relation const & t = get(tb);
             udoc const& u1 = t.get_udoc();
             doc_manager& dm = t.get_dm();

src/muz/rel/udoc_relation.h

@@ -39,21 +39,21 @@ namespace datalog {
         expr_ref to_formula(doc const& d) const;
     public:
         udoc_relation(udoc_plugin& p, relation_signature const& s);
-        virtual ~udoc_relation();
+        ~udoc_relation() override;
-        virtual void reset();
+        void reset() override;
-        virtual void add_fact(const relation_fact & f);
+        void add_fact(const relation_fact & f) override;
-        virtual void add_new_fact(const relation_fact & f);
+        void add_new_fact(const relation_fact & f) override;
-        virtual bool contains_fact(const relation_fact & f) const;
+        bool contains_fact(const relation_fact & f) const override;
-        virtual udoc_relation * clone() const;
+        udoc_relation * clone() const override;
-        virtual udoc_relation * complement(func_decl*) const;
+        udoc_relation * complement(func_decl*) const override;
-        virtual void to_formula(expr_ref& fml) const;
+        void to_formula(expr_ref& fml) const override;
         udoc_plugin& get_plugin() const; 
-        virtual bool fast_empty() const { return m_elems.is_empty(); }
+        bool fast_empty() const override { return m_elems.is_empty(); }
-        virtual bool empty() const; 
+        bool empty() const override;
-        virtual void display(std::ostream& out) const;
+        void display(std::ostream& out) const override;
-        virtual bool is_precise() const { return true; }
+        bool is_precise() const override { return true; }
-        virtual unsigned get_size_estimate_rows() const { return m_elems.size(); }
+        unsigned get_size_estimate_rows() const override { return m_elems.size(); }
-        virtual unsigned get_size_estimate_bytes() const;
+        unsigned get_size_estimate_bytes() const override;
 
         doc_manager& get_dm() const { return dm; }
         udoc const& get_udoc() const { return m_elems; }
@@ -113,37 +113,37 @@ namespace datalog {
         expr* mk_numeral(rational const& r, sort* s);
     public:
         udoc_plugin(relation_manager& rm);
-        ~udoc_plugin();
+        ~udoc_plugin() override;
-        virtual bool can_handle_signature(const relation_signature & s);
+        bool can_handle_signature(const relation_signature & s) override;
         static symbol get_name() { return symbol("doc"); }
-        virtual relation_base * mk_empty(const relation_signature & s);
+        relation_base * mk_empty(const relation_signature & s) override;
-        virtual relation_base * mk_full(func_decl* p, const relation_signature & s);
+        relation_base * mk_full(func_decl* p, const relation_signature & s) override;
-        virtual relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
+        relation_join_fn * mk_join_fn(const relation_base & t1, const relation_base & t2,
-            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2);
+            unsigned col_cnt, const unsigned * cols1, const unsigned * cols2) override;
-        virtual relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt, 
+        relation_transformer_fn * mk_project_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * removed_cols);
+            const unsigned * removed_cols) override;
-        virtual relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len, 
+        relation_transformer_fn * mk_rename_fn(const relation_base & t, unsigned permutation_cycle_len,
-            const unsigned * permutation_cycle);
+            const unsigned * permutation_cycle) override;
-        virtual relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_union_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src, 
+        relation_union_fn * mk_widen_fn(const relation_base & tgt, const relation_base & src,
-            const relation_base * delta);
+            const relation_base * delta) override;
-        virtual relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt, 
+        relation_mutator_fn * mk_filter_identical_fn(const relation_base & t, unsigned col_cnt,
-            const unsigned * identical_cols);
+            const unsigned * identical_cols) override;
-        virtual relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value, 
+        relation_mutator_fn * mk_filter_equal_fn(const relation_base & t, const relation_element & value,
-            unsigned col);
+            unsigned col) override;
-        virtual relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition);
+        relation_mutator_fn * mk_filter_interpreted_fn(const relation_base & t, app * condition) override;
-        virtual relation_intersection_filter_fn * mk_filter_by_negation_fn(
+        relation_intersection_filter_fn * mk_filter_by_negation_fn(
             const relation_base& t,
             const relation_base& neg, unsigned joined_col_cnt, const unsigned *t_cols,
-            const unsigned *negated_cols);
+            const unsigned *negated_cols) override;
-        virtual relation_transformer_fn * mk_filter_interpreted_and_project_fn(
+        relation_transformer_fn * mk_filter_interpreted_and_project_fn(
             const relation_base & t, app * condition,
-            unsigned removed_col_cnt, const unsigned * removed_cols);
+            unsigned removed_col_cnt, const unsigned * removed_cols) override;
-        virtual relation_join_fn * mk_join_project_fn(
+        relation_join_fn * mk_join_project_fn(
             relation_base const& t1, relation_base const& t2,
             unsigned joined_col_cnt, const unsigned * cols1, const unsigned * cols2,
-            unsigned removed_col_cnt, const unsigned * removed_cols);
+            unsigned removed_col_cnt, const unsigned * removed_cols) override;
 
         void disable_fast_pass() { m_disable_fast_pass = true; }
     };

src/muz/spacer/spacer_dl_interface.h

@@ -45,39 +45,39 @@ class dl_interface : public datalog::engine_base {
 
 public:
     dl_interface(datalog::context& ctx);
-    ~dl_interface();
+    ~dl_interface() override;
 
-    lbool query(expr* query);
+    lbool query(expr* query) override;
 
-    lbool query_from_lvl(expr* query, unsigned lvl);
+    lbool query_from_lvl(expr* query, unsigned lvl) override;
 
-    void display_certificate(std::ostream& out) const;
+    void display_certificate(std::ostream& out) const override;
 
-    void collect_statistics(statistics& st) const;
+    void collect_statistics(statistics& st) const override;
 
-    void reset_statistics();
+    void reset_statistics() override;
 
-    expr_ref get_answer();
+    expr_ref get_answer() override;
 
-    expr_ref get_ground_sat_answer();
+    expr_ref get_ground_sat_answer() override;
 
-    void get_rules_along_trace(datalog::rule_ref_vector& rules);
+    void get_rules_along_trace(datalog::rule_ref_vector& rules) override;
 
-    unsigned get_num_levels(func_decl* pred);
+    unsigned get_num_levels(func_decl* pred) override;
 
-    expr_ref get_cover_delta(int level, func_decl* pred);
+    expr_ref get_cover_delta(int level, func_decl* pred) override;
 
-    void add_cover(int level, func_decl* pred, expr* property);
+    void add_cover(int level, func_decl* pred, expr* property) override;
 
-    void add_invariant(func_decl* pred, expr* property);
+    void add_invariant(func_decl* pred, expr* property) override;
 
-    expr_ref get_reachable(func_decl *pred);
+    expr_ref get_reachable(func_decl *pred) override;
 
-    void updt_params();
+    void updt_params() override;
 
-    model_ref get_model();
+    model_ref get_model() override;
 
-    proof_ref get_proof();
+    proof_ref get_proof() override;
 
 };
 }

src/muz/spacer/spacer_generalizers.h

@@ -30,8 +30,8 @@ namespace spacer {
 class lemma_sanity_checker : public lemma_generalizer {
 public:
     lemma_sanity_checker(context& ctx) : lemma_generalizer(ctx) {}
-    virtual ~lemma_sanity_checker() {}
+    ~lemma_sanity_checker() override {}
-    virtual void operator()(lemma_ref &lemma);
+    void operator()(lemma_ref &lemma) override;
 };
 
 /**
@@ -53,11 +53,11 @@ class lemma_bool_inductive_generalizer : public lemma_generalizer {
 public:
     lemma_bool_inductive_generalizer(context& ctx, unsigned failure_limit) :
         lemma_generalizer(ctx), m_failure_limit(failure_limit) {}
-    virtual ~lemma_bool_inductive_generalizer() {}
+    ~lemma_bool_inductive_generalizer() override {}
-    virtual void operator()(lemma_ref &lemma);
+    void operator()(lemma_ref &lemma) override;
 
-    virtual void collect_statistics(statistics& st) const;
+    void collect_statistics(statistics& st) const override;
-    virtual void reset_statistics() {m_st.reset();}
+    void reset_statistics() override {m_st.reset();}
 };
 
 class unsat_core_generalizer : public lemma_generalizer {
@@ -72,26 +72,26 @@ class unsat_core_generalizer : public lemma_generalizer {
     stats m_st;
 public:
     unsat_core_generalizer(context &ctx) : lemma_generalizer(ctx) {}
-    virtual ~unsat_core_generalizer() {}
+    ~unsat_core_generalizer() override {}
-    virtual void operator()(lemma_ref &lemma);
+    void operator()(lemma_ref &lemma) override;
 
-    virtual void collect_statistics(statistics &st) const;
+    void collect_statistics(statistics &st) const override;
-    virtual void reset_statistics() {m_st.reset();}
+    void reset_statistics() override {m_st.reset();}
 };
 
 class lemma_array_eq_generalizer : public lemma_generalizer {
 public:
     lemma_array_eq_generalizer(context &ctx) : lemma_generalizer(ctx) {}
-    virtual ~lemma_array_eq_generalizer() {}
+    ~lemma_array_eq_generalizer() override {}
-    virtual void operator()(lemma_ref &lemma);
+    void operator()(lemma_ref &lemma) override;
 
 };
 
 class lemma_eq_generalizer : public lemma_generalizer {
 public:
     lemma_eq_generalizer(context &ctx) : lemma_generalizer(ctx) {}
-    virtual ~lemma_eq_generalizer() {}
+    ~lemma_eq_generalizer() override {}
-    virtual void operator()(lemma_ref &lemma);
+    void operator()(lemma_ref &lemma) override;
 };
 
 

src/muz/spacer/spacer_itp_solver.h

@@ -86,10 +86,10 @@ public:
         m_farkas_a_const(farkas_a_const)
     {}
 
-    virtual ~itp_solver() {}
+    ~itp_solver() override {}
 
     /* itp solver specific */
-    virtual void get_unsat_core(expr_ref_vector &core);
+    void get_unsat_core(expr_ref_vector &core) override;
     virtual void get_itp_core(expr_ref_vector &core);
     void set_split_literals(bool v) {m_split_literals = v;}
     bool mk_proxies(expr_ref_vector &v, unsigned from = 0);
@@ -104,53 +104,53 @@ public:
 
     /* solver interface */
 
-    virtual solver* translate(ast_manager &m, params_ref const &p)
+    solver* translate(ast_manager &m, params_ref const &p) override
     {return m_solver.translate(m, p);}
-    virtual void updt_params(params_ref const &p)
+    void updt_params(params_ref const &p) override
     {m_solver.updt_params(p);}
-    virtual void collect_param_descrs(param_descrs &r)
+    void collect_param_descrs(param_descrs &r) override
     {m_solver.collect_param_descrs(r);}
-    virtual void set_produce_models(bool f)
+    void set_produce_models(bool f) override
     {m_solver.set_produce_models(f);}
-    virtual void assert_expr(expr *t)
+    void assert_expr(expr *t) override
     {m_solver.assert_expr(t);}
 
-    virtual void assert_expr(expr *t, expr *a)
+    void assert_expr(expr *t, expr *a) override
     {NOT_IMPLEMENTED_YET();}
 
-    virtual void push();
+    void push() override;
-    virtual void pop(unsigned n);
+    void pop(unsigned n) override;
-    virtual unsigned get_scope_level() const
+    unsigned get_scope_level() const override
     {return m_solver.get_scope_level();}
 
-    virtual lbool check_sat(unsigned num_assumptions, expr * const *assumptions);
+    lbool check_sat(unsigned num_assumptions, expr * const *assumptions) override;
-    virtual void set_progress_callback(progress_callback *callback)
+    void set_progress_callback(progress_callback *callback) override
     {m_solver.set_progress_callback(callback);}
-    virtual unsigned get_num_assertions() const
+    unsigned get_num_assertions() const override
     {return m_solver.get_num_assertions();}
-    virtual expr * get_assertion(unsigned idx) const
+    expr * get_assertion(unsigned idx) const override
     {return m_solver.get_assertion(idx);}
-    virtual unsigned get_num_assumptions() const
+    unsigned get_num_assumptions() const override
     {return m_solver.get_num_assumptions();}
-    virtual expr * get_assumption(unsigned idx) const
+    expr * get_assumption(unsigned idx) const override
     {return m_solver.get_assumption(idx);}
-    virtual std::ostream &display(std::ostream &out, unsigned n, expr* const* es) const
+    std::ostream &display(std::ostream &out, unsigned n, expr* const* es) const override
     { return m_solver.display(out, n, es); }
 
     /* check_sat_result interface */
 
-    virtual void collect_statistics(statistics &st) const ;
+    void collect_statistics(statistics &st) const override ;
     virtual void reset_statistics();
-    virtual void get_unsat_core(ptr_vector<expr> &r);
+    void get_unsat_core(ptr_vector<expr> &r) override;
-    virtual void get_model(model_ref &m) {m_solver.get_model(m);}
+    void get_model(model_ref &m) override {m_solver.get_model(m);}
-    virtual proof *get_proof() {return m_solver.get_proof();}
+    proof *get_proof() override {return m_solver.get_proof();}
-    virtual std::string reason_unknown() const
+    std::string reason_unknown() const override
     {return m_solver.reason_unknown();}
-    virtual void set_reason_unknown(char const* msg)
+    void set_reason_unknown(char const* msg) override
     {m_solver.set_reason_unknown(msg);}
-    virtual void get_labels(svector<symbol> &r)
+    void get_labels(svector<symbol> &r) override
     {m_solver.get_labels(r);}
-    virtual ast_manager &get_manager() const {return m;}
+    ast_manager &get_manager() const override {return m;}
 
     virtual void refresh();
 

src/muz/spacer/spacer_qe_project.cpp

@@ -190,14 +190,14 @@ namespace qe {
 
     class is_relevant_default : public i_expr_pred {
     public:
-        bool operator()(expr* e) {
+        bool operator()(expr* e) override {
             return true;
         }
     };
 
     class mk_atom_default : public i_nnf_atom {
     public:
-        virtual void operator()(expr* e, bool pol, expr_ref& result) {
+        void operator()(expr* e, bool pol, expr_ref& result) override {
             if (pol) result = e;
             else result = result.get_manager().mk_not(e);
         }

src/muz/spacer/spacer_unsat_core_plugin.h

@@ -43,7 +43,7 @@ class unsat_core_plugin_lemma : public unsat_core_plugin {
 public:
     unsat_core_plugin_lemma(unsat_core_learner& learner) : unsat_core_plugin(learner){};
 
-    virtual void compute_partial_core(proof* step) override;
+    void compute_partial_core(proof* step) override;
 
 private:
     void add_lowest_split_to_core(proof* step) const;
@@ -55,7 +55,7 @@ class unsat_core_plugin_farkas_lemma : public unsat_core_plugin {
 public:
     unsat_core_plugin_farkas_lemma(unsat_core_learner& learner, bool split_literals, bool use_constant_from_a=true) : unsat_core_plugin(learner), m_split_literals(split_literals), m_use_constant_from_a(use_constant_from_a) {};
 
-    virtual void compute_partial_core(proof* step) override;
+    void compute_partial_core(proof* step) override;
 
 private:
     bool m_split_literals;
@@ -71,8 +71,8 @@ private:
     public:
         unsat_core_plugin_farkas_lemma_optimized(unsat_core_learner& learner, ast_manager& m) : unsat_core_plugin(learner), m(m) {};
 
-        virtual void compute_partial_core(proof* step) override;
+        void compute_partial_core(proof* step) override;
-        virtual void finalize() override;
+        void finalize() override;
 
     protected:
         vector<vector<std::pair<app*, rational> > > m_linear_combinations;
@@ -88,7 +88,7 @@ private:
     public:
         unsat_core_plugin_farkas_lemma_bounded(unsat_core_learner& learner, ast_manager& m) : unsat_core_plugin_farkas_lemma_optimized(learner, m) {};
 
-        virtual void finalize() override;
+        void finalize() override;
     };
 
     class unsat_core_plugin_min_cut : public unsat_core_plugin {
@@ -96,8 +96,8 @@ private:
     public:
         unsat_core_plugin_min_cut(unsat_core_learner& learner, ast_manager& m);
 
-        virtual void compute_partial_core(proof* step) override;
+        void compute_partial_core(proof* step) override;
-        virtual void finalize() override;
+        void finalize() override;
     private:
         ast_manager& m;
 

src/muz/spacer/spacer_virtual_solver.h

@@ -65,46 +65,46 @@ private:
     void refresh();
 
 public:
-    virtual ~virtual_solver();
+    ~virtual_solver() override;
-    virtual unsigned get_num_assumptions() const
+    unsigned get_num_assumptions() const override
     {
         unsigned sz = solver_na2as::get_num_assumptions();
         return m_virtual ? sz - 1 : sz;
     }
-    virtual expr* get_assumption(unsigned idx) const
+    expr* get_assumption(unsigned idx) const override
     {
         if(m_virtual) { idx++; }
         return solver_na2as::get_assumption(idx);
     }
 
-    virtual void get_unsat_core(ptr_vector<expr> &r);
+    void get_unsat_core(ptr_vector<expr> &r) override;
-    virtual void assert_expr(expr *e);
+    void assert_expr(expr *e) override;
-    virtual void collect_statistics(statistics &st) const {}
+    void collect_statistics(statistics &st) const override {}
-    virtual void get_model(model_ref &m) {m_context.get_model(m);}
+    void get_model(model_ref &m) override {m_context.get_model(m);}
-    virtual proof* get_proof();
+    proof* get_proof() override;
-    virtual std::string reason_unknown() const
+    std::string reason_unknown() const override
     {return m_context.last_failure_as_string();}
-    virtual void set_reason_unknown(char const *msg)
+    void set_reason_unknown(char const *msg) override
     {m_context.set_reason_unknown(msg);}
-    virtual ast_manager& get_manager() const {return m;}
+    ast_manager& get_manager() const override {return m;}
-    virtual void get_labels(svector<symbol> &r);
+    void get_labels(svector<symbol> &r) override;
-    virtual void set_produce_models(bool f);
+    void set_produce_models(bool f) override;
     virtual bool get_produce_models();
     virtual smt_params &fparams();
     virtual void reset();
-    virtual void set_progress_callback(progress_callback *callback)
+    void set_progress_callback(progress_callback *callback) override
     {UNREACHABLE();}
 
-    virtual solver *translate(ast_manager &m, params_ref const &p);
+    solver *translate(ast_manager &m, params_ref const &p) override;
 
-    virtual void updt_params(params_ref const &p);
+    void updt_params(params_ref const &p) override;
-    virtual void collect_param_descrs(param_descrs &r);
+    void collect_param_descrs(param_descrs &r) override;
 
 
 protected:
-    virtual lbool check_sat_core(unsigned num_assumptions, expr *const * assumptions);
+    lbool check_sat_core(unsigned num_assumptions, expr *const * assumptions) override;
-    virtual void push_core();
+    void push_core() override;
-    virtual void pop_core(unsigned n);
+    void pop_core(unsigned n) override;
 };
 
 /// multi-solver abstraction on top of a single smt::kernel

src/muz/tab/tab_context.h

@@ -32,13 +32,13 @@ namespace datalog {
         imp* m_imp;
     public:
         tab(context& ctx);
-        ~tab();
+        ~tab() override;
-        virtual lbool query(expr* query);
+        lbool query(expr* query) override;
-        virtual void cleanup();
+        void cleanup() override;
-        virtual void reset_statistics();
+        void reset_statistics() override;
-        virtual void collect_statistics(statistics& st) const;
+        void collect_statistics(statistics& st) const override;
-        virtual void display_certificate(std::ostream& out) const;        
+        void display_certificate(std::ostream& out) const override;
-        virtual expr_ref get_answer();
+        expr_ref get_answer() override;
     };
 };
 

src/muz/transforms/dl_mk_array_blast.h

@@ -66,9 +66,9 @@ namespace datalog {
         */
         mk_array_blast(context & ctx, unsigned priority);
 
-        virtual ~mk_array_blast();
+        ~mk_array_blast() override;
         
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
 
     };
 

src/muz/transforms/dl_mk_array_eq_rewrite.h

@@ -40,8 +40,8 @@ namespace datalog {
 
      public:
         mk_array_eq_rewrite(context & ctx, unsigned priority);
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
-        virtual ~mk_array_eq_rewrite(){}
+        ~mk_array_eq_rewrite() override{}
     };
 
 

src/muz/transforms/dl_mk_array_instantiation.h

@@ -112,8 +112,8 @@ namespace datalog {
        expr_ref_vector getId(app*old_pred, const expr_ref_vector& new_args);
      public:
         mk_array_instantiation(context & ctx, unsigned priority);
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
-        virtual ~mk_array_instantiation(){}
+        ~mk_array_instantiation() override{}
     };
 
 

src/muz/transforms/dl_mk_backwards.h

@@ -28,8 +28,8 @@ namespace datalog {
         context&     m_ctx;
     public:
         mk_backwards(context & ctx, unsigned priority = 33000);
-        ~mk_backwards();        
+        ~mk_backwards() override;
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
     };
 
 };

src/muz/transforms/dl_mk_bit_blast.cpp

@@ -59,11 +59,11 @@ namespace datalog {
             m_new_funcs.push_back(new_f);
         }
 
-        virtual model_converter * translate(ast_translation & translator) { 
+        model_converter * translate(ast_translation & translator) override {
             return alloc(bit_blast_model_converter, m);
         }
 
-        virtual void operator()(model_ref & model) {
+        void operator()(model_ref & model) override {
             for (unsigned i = 0; i < m_new_funcs.size(); ++i) {
                 func_decl* p = m_new_funcs[i].get();
                 func_decl* q = m_old_funcs[i].get();

src/muz/transforms/dl_mk_bit_blast.h

@@ -28,8 +28,8 @@ namespace datalog {
         impl* m_impl;
     public:
         mk_bit_blast(context & ctx, unsigned priority = 35000);
-        ~mk_bit_blast();        
+        ~mk_bit_blast() override;
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
     };
 
 };

src/muz/transforms/dl_mk_coalesce.h

@@ -52,7 +52,7 @@ namespace datalog {
          */
         mk_coalesce(context & ctx);
         
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
     };
 
 };

src/muz/transforms/dl_mk_coi_filter.h

@@ -42,7 +42,7 @@ namespace datalog {
             m(ctx.get_manager()),
             m_context(ctx) {}
 
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
     };
 }
 

src/muz/transforms/dl_mk_filter_rules.h

@@ -73,11 +73,11 @@ namespace datalog {
 
     public:
         mk_filter_rules(context & ctx);
-        ~mk_filter_rules();
+        ~mk_filter_rules() override;
         /**
            \brief Return a new rule set where only filter rules contain atoms with repeated variables and/or values.
         */
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
     };
 
 };

src/muz/transforms/dl_mk_interp_tail_simplifier.h

@@ -90,7 +90,7 @@ namespace datalog {
         bool transform_rules(const rule_set & orig, rule_set & tgt);
     public:
         mk_interp_tail_simplifier(context & ctx, unsigned priority=40000);
-        virtual ~mk_interp_tail_simplifier();
+        ~mk_interp_tail_simplifier() override;
 
         /**If rule should be retained, assign transformed version to res and return true;
         if rule can be deleted, return false.
@@ -100,7 +100,7 @@ namespace datalog {
         */
         bool transform_rule(rule * r, rule_ref& res);
 
-        rule_set * operator()(rule_set const & source);
+        rule_set * operator()(rule_set const & source) override;
     };
 
 };

src/muz/transforms/dl_mk_karr_invariants.cpp

@@ -111,7 +111,7 @@ namespace datalog {
         
         add_invariant_model_converter(ast_manager& m): m(m), a(m), m_funcs(m), m_invs(m) {}
 
-        virtual ~add_invariant_model_converter() { }
+        ~add_invariant_model_converter() override { }
 
         void add(func_decl* p, expr* inv) {
             if (!m.is_true(inv)) {
@@ -120,7 +120,7 @@ namespace datalog {
             }
         }
 
-        virtual void operator()(model_ref & mr) {
+        void operator()(model_ref & mr) override {
             for (unsigned i = 0; i < m_funcs.size(); ++i) {
                 func_decl* p = m_funcs[i].get();
                 func_interp* f = mr->get_func_interp(p);
@@ -142,7 +142,7 @@ namespace datalog {
             }            
         }
     
-        virtual model_converter * translate(ast_translation & translator) {
+        model_converter * translate(ast_translation & translator) override {
             add_invariant_model_converter* mc = alloc(add_invariant_model_converter, m);
             for (unsigned i = 0; i < m_funcs.size(); ++i) {
                 mc->add(translator(m_funcs[i].get()), m_invs[i].get());