Use = default for virtual constructors.

src/api/api_util.h

@@ -40,7 +40,7 @@ namespace api {
         context& m_context;
     public:
         object(context& c);
-        virtual ~object() {}
+        virtual ~object() = default;
         unsigned ref_count() const { return m_ref_count; }
         unsigned id() const { return m_id; }
         void inc_ref();

src/api/c++/z3++.h

@@ -87,7 +87,7 @@ namespace z3 {
     class exception : public std::exception {
         std::string m_msg;
     public:
-        virtual ~exception() throw() {}
+        virtual ~exception() throw() = default;
         exception(char const * msg):m_msg(msg) {}
         char const * msg() const { return m_msg.c_str(); }
         char const * what() const throw() { return m_msg.c_str(); }

src/ast/ast.h

@@ -1024,7 +1024,7 @@ protected:
     friend class ast_manager;
 
 public:
-    virtual ~decl_plugin() {}
+    virtual ~decl_plugin() = default;
     virtual void finalize() {}
 
 
@@ -2582,7 +2582,7 @@ class ast_mark {
     obj_mark<expr>                        m_expr_marks;
     obj_mark<decl, bit_vector, decl2uint> m_decl_marks;
 public:
-    virtual ~ast_mark() {}
+    virtual ~ast_mark() = default;
     bool is_marked(ast * n) const;
     virtual void mark(ast * n, bool flag);
     virtual void reset();

src/ast/ast_printer.h

@@ -24,7 +24,7 @@ Revision History:
 
 class ast_printer {
 public:
-    virtual ~ast_printer() {}
+    virtual ~ast_printer() = default;
     virtual void pp(sort * s, format_ns::format_ref & r) const { UNREACHABLE(); }
     virtual void pp(func_decl * f, format_ns::format_ref & r) const { UNREACHABLE(); }
     virtual void pp(expr * n, unsigned num_vars, char const * var_prefix, format_ns::format_ref & r, sbuffer<symbol> & var_names) const { UNREACHABLE(); }

src/ast/ast_smt2_pp.h

@@ -46,7 +46,7 @@ protected:
     format_ns::format * pp_as(format_ns::format * fname, sort * s);
     format_ns::format * pp_signature(format_ns::format * f_name, func_decl * f);
 public:
-    virtual ~smt2_pp_environment() {}
+    virtual ~smt2_pp_environment() = default;
     virtual ast_manager & get_manager() const = 0;
     virtual arith_util & get_autil() = 0;
     virtual bv_util & get_bvutil() = 0;

src/ast/datatype_decl_plugin.h

@@ -105,7 +105,7 @@ namespace datatype {
         class size {
             unsigned m_ref{ 0 };
         public:
-            virtual ~size() { }
+            virtual ~size() = default;
             void inc_ref() { ++m_ref; }
             void dec_ref();
             static size* mk_offset(sort_size const& s); 

src/ast/expr_functors.h

@@ -27,14 +27,14 @@ Revision History:
 class i_expr_pred {
 public:
     virtual bool operator()(expr* e) = 0;
-    virtual ~i_expr_pred() {}
+    virtual ~i_expr_pred() = default;
 };
 
 
 class i_sort_pred {
 public:
     virtual bool operator()(sort* s) = 0;
-    virtual ~i_sort_pred() {}
+    virtual ~i_sort_pred() = default;
 };
 
 

src/ast/macros/quantifier_macro_info.h

@@ -39,7 +39,7 @@ protected:
     void collect_macro_candidates(quantifier* q);
 public:
     quantifier_macro_info(ast_manager& m, quantifier* q);
-    virtual ~quantifier_macro_info() {}
+    virtual ~quantifier_macro_info() = default;
     bool is_auf() const { return m_is_auf; }
     quantifier* get_flat_q() const { return m_flat_q; }
     bool has_cond_macros() const { return !m_cond_macros.empty(); }

src/ast/normal_forms/elim_term_ite.h

@@ -31,7 +31,7 @@ public:
     elim_term_ite_cfg(ast_manager & m, defined_names & d): m(m), m_defined_names(d) { 
         // TBD enable_ac_support(false);
     }
-    virtual ~elim_term_ite_cfg() {}
+    virtual ~elim_term_ite_cfg() = default;
     vector<justified_expr> const& new_defs() const { return m_new_defs; }
     br_status reduce_app(func_decl* f, unsigned n, expr *const* args, expr_ref& result, proof_ref& result_pr);
     void push() { m_lim.push_back(m_new_defs.size()); }

src/ast/normal_forms/name_exprs.h

@@ -29,7 +29,7 @@ public:
 
 class name_exprs {
 public:
-    virtual ~name_exprs() {}
+    virtual ~name_exprs() = default;
     virtual void operator()(expr * n,                          // [IN] expression that contain the sub-expressions to be named
                             expr_ref_vector & new_defs,        // [OUT] new definitions
                             proof_ref_vector & new_def_proofs, // [OUT] proofs of the new definitions 

src/ast/recfun_decl_plugin.h

@@ -49,7 +49,7 @@ namespace recfun {
 
     class replace {
     public:
-        virtual ~replace() {}
+        virtual ~replace() = default;
         virtual void reset() = 0;
         virtual void insert(expr* d, expr* r) = 0;
         virtual expr_ref operator()(expr* e) = 0;

src/ast/rewriter/expr_replacer.h

@@ -28,7 +28,7 @@ Notes:
 class expr_replacer {
     struct scoped_set_subst;
 public:
-    virtual ~expr_replacer() {}
+    virtual ~expr_replacer() = default;
 
     virtual ast_manager & m() const = 0;
     virtual void set_substitution(expr_substitution * s) = 0;

src/ast/rewriter/seq_rewriter.h

@@ -83,7 +83,7 @@ public:
 
 class expr_solver {
 public:
-    virtual ~expr_solver() {}
+    virtual ~expr_solver() = default;
     virtual lbool check_sat(expr* e) = 0;
 };
 

src/ast/substitution/substitution_tree.h

@@ -29,7 +29,7 @@ protected:
     substitution & m_subst;
 public:
     st_visitor(substitution & s):m_subst(s) {}
-    virtual ~st_visitor() {}
+    virtual ~st_visitor() = default;
     substitution & get_substitution() { return m_subst; }
     virtual bool operator()(expr * e) { return true; }
 };

src/ast/value_generator.h

@@ -23,7 +23,7 @@
 
 class value_generator_core {
  public:        
-    virtual ~value_generator_core() {}
+    virtual ~value_generator_core() = default;
     virtual family_id get_fid() const = 0;
     virtual expr_ref get_value(sort* s, unsigned index) = 0;
 };

src/cmd_context/cmd_context.h

@@ -96,7 +96,7 @@ public:
 class object_ref {
     unsigned m_ref_count = 0;
 public:
-    virtual ~object_ref() {}
+    virtual ~object_ref() = default;
     virtual void finalize(cmd_context & ctx) = 0;
     void inc_ref(cmd_context & ctx) {
         m_ref_count++;

src/cmd_context/pdecl.cpp

@@ -781,7 +781,7 @@ struct pdecl_manager::sort_info {
         m_decl(d) {
         m.inc_ref(d);
     }
-    virtual ~sort_info() {}
+    virtual ~sort_info() = default;
     virtual unsigned obj_size() const { return sizeof(sort_info); }
     virtual void finalize(pdecl_manager & m) { m.dec_ref(m_decl); }
     virtual void display(std::ostream & out, pdecl_manager const & m) const = 0;

src/cmd_context/pdecl.h

@@ -38,7 +38,7 @@ protected:
     virtual size_t obj_size() const { UNREACHABLE(); return sizeof(*this); }
     pdecl(unsigned id, unsigned num_params):m_id(id), m_num_params(num_params), m_ref_count(0) {}
     virtual void finalize(pdecl_manager & m) {}
-    virtual ~pdecl() {}
+    virtual ~pdecl() = default;
 public:
     virtual bool check_num_params(pdecl * other) const { return m_num_params == other->m_num_params; }
     unsigned get_num_params() const { return m_num_params; }
@@ -257,7 +257,7 @@ public:
 
 class new_datatype_eh {
 public:
-    virtual ~new_datatype_eh() {}
+    virtual ~new_datatype_eh() = default;
     virtual void operator()(sort * dt, pdecl* pd) = 0;
 };
 

src/math/automata/boolean_algebra.h

@@ -25,7 +25,7 @@ Revision History:
 template<class T>
 class positive_boolean_algebra {
 public:
-    virtual ~positive_boolean_algebra() {}
+    virtual ~positive_boolean_algebra() = default;
     virtual T mk_false() = 0;
     virtual T mk_true() = 0;
     virtual T mk_and(T x, T y) = 0;

src/math/hilbert/heap_trie.h

@@ -66,7 +66,7 @@ class heap_trie {
         unsigned m_ref;
     public:
         node(node_t t): m_type(t), m_ref(0) {}
-        virtual ~node() {}
+        virtual ~node() = default;
         node_t type() const { return m_type; }
         void inc_ref() { ++m_ref; }
         void dec_ref() { SASSERT(m_ref > 0); --m_ref; }

src/math/lp/lar_constraints.h

@@ -57,7 +57,7 @@ public:
 
     virtual vector<std::pair<mpq, var_index>> coeffs() const = 0;
     lar_base_constraint(unsigned j, lconstraint_kind kind, const mpq& right_side) :m_kind(kind), m_right_side(right_side), m_active(false), m_j(j) {}
-    virtual ~lar_base_constraint() {}
+    virtual ~lar_base_constraint() = default;
 
     lconstraint_kind kind() const { return m_kind; }
     mpq const& rhs() const { return m_right_side; }

src/math/lp/lp_api.h

@@ -49,7 +49,7 @@ namespace lp_api {
             m_constraints[1] = ct;
         }
 
-        virtual ~bound() {}
+        virtual ~bound() = default;
 
         theory_var get_var() const { return m_var; }
 

src/math/lp/matrix.h

@@ -22,7 +22,7 @@ public:
     virtual void set_number_of_rows(unsigned m)  = 0;
     virtual void set_number_of_columns(unsigned n) = 0;
 
-    virtual ~matrix() {}
+    virtual ~matrix() = default;
 
     bool is_equal(const matrix<T, X>& other);
     bool operator == (matrix<T, X> const & other) {

src/math/lp/nex.h

@@ -85,7 +85,7 @@ public:
     bool is_scalar() const { return type() == expr_type::SCALAR; }
     virtual bool is_pure_monomial() const { return false; }
     std::string str() const { std::stringstream ss; print(ss); return ss.str(); }
-    virtual ~nex() {}
+    virtual ~nex() = default;
     virtual bool contains(lpvar j) const { return false; }
     virtual unsigned get_degree() const = 0;
     // simplifies the expression and also assigns the address of "this" to *e

src/math/lp/tail_matrix.h

@@ -37,7 +37,7 @@ public:
     virtual void apply_from_left(vector<X> & w, lp_settings & settings) = 0;
     virtual void apply_from_right(vector<T> & w) = 0;
     virtual void apply_from_right(indexed_vector<T> & w) = 0;
-    virtual ~tail_matrix() {}
+    virtual ~tail_matrix() = default;
     virtual bool is_dense() const = 0;
     struct ref_row {
         const tail_matrix & m_A;

src/math/simplex/network_flow.h

@@ -87,7 +87,7 @@ namespace smt {
                   m_states(states),
                   m_enter_id(enter_id) {
             }
-            virtual ~pivot_rule_impl() {}
+            virtual ~pivot_rule_impl() = default;
             virtual bool choose_entering_edge() = 0;
             virtual pivot_rule rule() const = 0;
         };

src/math/subpaving/subpaving.h

@@ -39,7 +39,7 @@ namespace subpaving {
 
 class context {
 public:
-    virtual ~context() {}
+    virtual ~context() = default;
 
     virtual unsynch_mpq_manager & qm() const = 0;
 

src/math/subpaving/subpaving_t.h

@@ -385,7 +385,7 @@ public:
         context_t * m_ctx;
     public:
         node_selector(context_t * ctx):m_ctx(ctx) {}
-        virtual ~node_selector() {}
+        virtual ~node_selector() = default;
 
         context_t * ctx() const { return m_ctx; }
 
@@ -403,7 +403,7 @@ public:
         context_t * m_ctx;
     public:
         var_selector(context_t * ctx):m_ctx(ctx) {}
-        virtual ~var_selector() {}
+        virtual ~var_selector() = default;
 
         context_t * ctx() const { return m_ctx; }
 
@@ -436,7 +436,7 @@ public:
         context_t * m_ctx;
     public:
         node_splitter(context_t * ctx):m_ctx(ctx) {}
-        virtual ~node_splitter() {}
+        virtual ~node_splitter() = default;
         
         context_t * ctx() const { return m_ctx; }
         node * mk_node(node * p) { return ctx()->mk_node(p); }

src/model/model_macro_solver.h

@@ -20,7 +20,7 @@ Author:
 
 class quantifier2macro_infos {
 public:
-    virtual ~quantifier2macro_infos() {}
+    virtual ~quantifier2macro_infos() = default;
     virtual quantifier_macro_info* operator()(quantifier* q) = 0;
 };
 
@@ -48,7 +48,7 @@ public:
         m_model(nullptr) {
     }
 
-    virtual ~base_macro_solver() {}
+    virtual ~base_macro_solver() = default;
 
     /**
        \brief Try to satisfy quantifiers in qs by using macro definitions.

src/muz/base/dl_context.cpp

@@ -53,7 +53,7 @@ namespace datalog {
                 m_limited_size = ctx.get_decl_util().try_get_size(s, m_size);
         }
     public:
-        virtual ~sort_domain() {}
+        virtual ~sort_domain() = default;
 
         sort_kind get_kind() const { return m_kind; }
         virtual unsigned get_constant_count() const = 0;

src/muz/base/dl_engine_base.h

@@ -42,7 +42,7 @@ namespace datalog {
         std::string m_name;
     public:
         engine_base(ast_manager& m, char const* name): m(m), m_name(name) {}
-        virtual ~engine_base() {}
+        virtual ~engine_base() = default;
 
         virtual expr_ref get_answer() = 0;
         virtual expr_ref get_ground_sat_answer () {

src/muz/base/dl_rule_transformer.h

@@ -89,7 +89,7 @@ namespace datalog {
             m_can_destratify_negation(can_destratify_negation), m_transformer(nullptr) {}
 
     public:
-        virtual ~plugin() {}
+        virtual ~plugin() = default;
 
         unsigned get_priority() { return m_priority; }
         bool can_destratify_negation() const { return m_can_destratify_negation; }

src/muz/fp/datalog_parser.h

@@ -27,7 +27,7 @@ namespace datalog {
     public:        
         static parser * create(context& ctx, ast_manager & ast_manager);
 
-        virtual ~parser() {}
+        virtual ~parser() = default;
 
         virtual bool parse_file(char const * path) = 0;
         virtual bool parse_string(char const * string) = 0;
@@ -37,7 +37,7 @@ namespace datalog {
     public:        
         static wpa_parser * create(context& ctx, ast_manager & ast_manager);
 
-        virtual ~wpa_parser() {}
+        virtual ~wpa_parser() = default;
 
         virtual bool parse_directory(char const * path) = 0;
     };

src/muz/rel/dl_base.h

@@ -179,7 +179,7 @@ namespace datalog {
         class base_fn {
         public:
             base_fn() = default;
-            virtual ~base_fn() {}
+            virtual ~base_fn() = default;
 
             base_fn(const base_fn &) = delete;
             base_fn& operator=(const base_fn &) = delete;
@@ -260,7 +260,7 @@ namespace datalog {
             */
             bool check_kind(base_object const& r) const { return &r.get_plugin()==this; }
         public:
-            virtual ~plugin_object() {}
+            virtual ~plugin_object() = default;
 
             virtual void initialize(family_id fid) { m_kind = fid; }
 
@@ -423,7 +423,7 @@ namespace datalog {
             }
 #endif
 
-            virtual ~base_ancestor() {}
+            virtual ~base_ancestor() = default;
 
             void set_kind(family_id kind) { SASSERT(kind>=0); m_kind = kind; }
 
@@ -865,7 +865,7 @@ namespace datalog {
 
     class table_row_mutator_fn {
     public:
-        virtual ~table_row_mutator_fn() {}
+        virtual ~table_row_mutator_fn() = default;
         /**
             \brief The function is called for a particular table row. The \c func_columns contains
             a pointer to an array of functional column values that can be modified. If the function
@@ -879,7 +879,7 @@ namespace datalog {
 
     class table_row_pair_reduce_fn {
     public:
-        virtual ~table_row_pair_reduce_fn() {}
+        virtual ~table_row_pair_reduce_fn() = default;
         /**
             \brief The function is called for pair of table rows that became duplicated due to projection.
             The values that are in the first array after return from the function will be used for the
@@ -1095,7 +1095,7 @@ namespace datalog {
             unsigned m_ref_cnt;
         public:
             iterator_core() : m_ref_cnt(0) {}
-            virtual ~iterator_core() {}
+            virtual ~iterator_core() = default;
 
             iterator_core(const iterator_core &) = delete;
             iterator_core & operator=(const iterator_core &) = delete;
@@ -1124,7 +1124,7 @@ namespace datalog {
             unsigned m_ref_cnt;
         public:
             row_iterator_core() : m_ref_cnt(0) {}
-            virtual ~row_iterator_core() {}
+            virtual ~row_iterator_core() = default;
 
             row_iterator_core(const row_iterator_core &) = delete;
             row_iterator_core & operator=(const row_iterator_core &) = delete;
@@ -1205,7 +1205,7 @@ namespace datalog {
             typedef row_iterator const_iterator;
 
             row_interface(const table_base & parent_table) : m_parent_table(parent_table) {}
-            virtual ~row_interface() {}
+            virtual ~row_interface() = default;
 
             virtual table_element operator[](unsigned col) const = 0;
 

src/muz/rel/dl_external_relation.h

@@ -26,7 +26,7 @@ namespace datalog {
 
     class external_relation_context {
     public:
-        virtual ~external_relation_context() {}
+        virtual ~external_relation_context() = default;
 
         virtual family_id get_family_id() const = 0;
 

src/muz/rel/dl_instruction.h

@@ -317,7 +317,7 @@ namespace datalog {
     class instruction_block {
     public:
         struct instruction_observer {
-            virtual ~instruction_observer() {}
+            virtual ~instruction_observer() = default;
             virtual void notify(instruction * i) {}
         };
     private:

src/muz/rel/dl_lazy_table.h

@@ -107,7 +107,7 @@ namespace datalog {
     public:
         lazy_table_ref(lazy_table_plugin& p, table_signature const& sig): 
             m_plugin(p), m_signature(sig), m_ref(0) {}
-        virtual ~lazy_table_ref() {}
+        virtual ~lazy_table_ref() = default;
         void inc_ref() { ++m_ref; }
         void dec_ref() { --m_ref; if (0 == m_ref) dealloc(this);  }
         void release_table() { m_table.release(); }

src/muz/rel/dl_relation_manager.cpp

@@ -999,7 +999,7 @@ namespace datalog {
     class relation_manager::auxiliary_table_transformer_fn {
         table_fact m_row;
     public:
-        virtual ~auxiliary_table_transformer_fn() {}
+        virtual ~auxiliary_table_transformer_fn() = default;
         virtual const table_signature & get_result_signature() const = 0;
         virtual void modify_fact(table_fact & f) const = 0;
 
@@ -1241,7 +1241,7 @@ namespace datalog {
         table_fact m_row;
         svector<table_element> m_to_remove;
     public:
-        virtual ~auxiliary_table_filter_fn() {}
+        virtual ~auxiliary_table_filter_fn() = default;
         virtual bool should_remove(const table_fact & f) const = 0;
 
         void operator()(table_base & r) {

src/muz/rel/dl_sparse_table.cpp

@@ -274,7 +274,7 @@ namespace datalog {
         key_indexer(unsigned key_len, const unsigned * key_cols) 
             : m_key_cols(key_len, key_cols) {}
 
-        virtual ~key_indexer() {}
+        virtual ~key_indexer() = default;
 
         virtual void update(const sparse_table & t) {}
 

src/muz/rel/dl_table_plugin.h

@@ -40,7 +40,7 @@ namespace datalog {
 
         class base_fn {
         public:
-            virtual ~base_fn() {}
+            virtual ~base_fn() = default;
         };
 
         class join_fn : public base_fn {
@@ -113,7 +113,7 @@ namespace datalog {
             base_ancestor(kind k, relation_manager & m, const signature & s) 
                 : m_kind(k), m_manager(m), m_signature(s) {}
         public:
-            virtual ~base_ancestor() {}
+            virtual ~base_ancestor() = default;
 
             kind get_kind() const { return m_kind; }
             relation_manager & get_manager() const { return m_manager; }

src/muz/spacer/spacer_context.h

@@ -857,7 +857,7 @@ protected:
     context& m_ctx;
 public:
     lemma_generalizer(context& ctx): m_ctx(ctx) {}
-    virtual ~lemma_generalizer() {}
+    virtual ~lemma_generalizer() = default;
     virtual void operator()(lemma_ref &lemma) = 0;
     virtual void collect_statistics(statistics& st) const {}
     virtual void reset_statistics() {}

src/muz/spacer/spacer_unsat_core_plugin.h

@@ -31,7 +31,7 @@ namespace spacer {
         ast_manager& m;
     public:
         unsat_core_plugin(unsat_core_learner& learner);
-        virtual ~unsat_core_plugin() {};
+        virtual ~unsat_core_plugin() = default;
         virtual void compute_partial_core(proof* step) = 0;
         virtual void finalize(){};
 

src/opt/maxsmt.h

@@ -42,7 +42,7 @@ namespace opt {
 
     class maxsmt_solver {
     public:        
-        virtual ~maxsmt_solver() {}
+        virtual ~maxsmt_solver() = default;
         virtual lbool operator()() = 0;
         virtual rational get_lower() const = 0;
         virtual rational get_upper() const = 0;

src/opt/opt_lns.h

@@ -28,7 +28,7 @@ namespace opt {
 
     class lns_context {
     public:
-        virtual ~lns_context() {}
+        virtual ~lns_context() = default;
         virtual void update_model(model_ref& mdl) = 0;
         virtual void relax_cores(vector<expr_ref_vector> const& cores) = 0;
         virtual rational cost(model& mdl) = 0;

src/opt/opt_pareto.h

@@ -52,7 +52,7 @@ namespace opt {
             m_solver(s),
             m_params(p) {
         }
-        virtual ~pareto_base() {}
+        virtual ~pareto_base() = default;
         virtual void updt_params(params_ref & p) {
             m_solver->updt_params(p);
             m_params.copy(p);

src/opt/opt_sls_solver.h

@@ -55,7 +55,7 @@ namespace opt {
         {            
             updt_params(p);
         }
-        virtual ~sls_solver() {}
+        virtual ~sls_solver() = default;
 
         virtual void updt_params(params_ref & p) {
             m_solver->updt_params(p);

src/qe/mbp/mbp_plugin.h

@@ -59,7 +59,7 @@ namespace mbp {
 
     public:
         project_plugin(ast_manager& m) :m(m), m_cache(m), m_args(m), m_pure_eqs(m) {}
-        virtual ~project_plugin() {}
+        virtual ~project_plugin() = default;
         virtual bool operator()(model& model, app* var, app_ref_vector& vars, expr_ref_vector& lits) { return false; }
         /**
            \brief partial solver.

src/qe/mbp/mbp_solve_plugin.h

@@ -36,7 +36,7 @@ namespace mbp {
         bool is_variable(expr* e) const { return m_is_var(e); }
     public:
         solve_plugin(ast_manager& m, family_id fid, is_variable_proc& is_var) : m(m), m_id(fid), m_is_var(is_var) {}
-        virtual ~solve_plugin() {}
+        virtual ~solve_plugin() = default;
         family_id get_family_id() const { return m_id; }
         /// Process (and potentially augment) a literal
         expr_ref operator() (expr *lit);

src/qe/nlarith_util.h

@@ -116,7 +116,7 @@ namespace nlarith {
 
         class eval {
         public:
-            virtual ~eval() {}
+            virtual ~eval() = default;
             virtual lbool operator()(app* a) = 0;
         };
 
@@ -124,7 +124,7 @@ namespace nlarith {
         
         class branch {
         public:
-            virtual ~branch() {}
+            virtual ~branch() = default;
             virtual app* get_constraint() = 0;
             virtual void get_updates(ptr_vector<app>& atoms, svector<atom_update>& updates) = 0;
         };

src/qe/qe.cpp

@@ -877,7 +877,7 @@ namespace qe {
 
     class quant_elim {
     public:
-        virtual ~quant_elim() {}
+        virtual ~quant_elim() = default;
     
         virtual lbool eliminate_exists(
             unsigned num_vars, app* const* vars, 

src/qe/qe.h

@@ -149,7 +149,7 @@ namespace qe {
             m_ctx(ctx)
         {}
         
-        virtual ~qe_solver_plugin() {}
+        virtual ~qe_solver_plugin() = default;
         
         family_id get_family_id() { return m_fid; }
 

src/qe/qe_mbi.h

@@ -43,7 +43,7 @@ namespace qe {
         lbool is_shared_cached(expr* e);
     public:
         mbi_plugin(ast_manager& m): m(m), m_shared_trail(m) {}
-        virtual ~mbi_plugin() {}
+        virtual ~mbi_plugin() = default;
 
         /**
          * Set the shared symbols.

src/sat/sat_extension.h

@@ -70,7 +70,7 @@ namespace sat {
         solver* m_solver { nullptr };
     public:        
         extension(symbol const& name, int id): m_id(id), m_name(name) { }
-        virtual ~extension() {}
+        virtual ~extension() = default;
         int get_id() const { return m_id; }
         void set_solver(solver* s) { m_solver = s; }        
         solver& s() { return *m_solver; }

src/sat/sat_solver_core.h

@@ -31,7 +31,7 @@ namespace sat {
         reslimit&               m_rlimit;
     public:
         solver_core(reslimit& l) : m_rlimit(l) {}
-        virtual ~solver_core() {}
+        virtual ~solver_core() = default;
 
         // add clauses
         virtual void add_clause(unsigned n, literal* lits, status st) = 0;

src/sat/sat_types.h

@@ -80,7 +80,7 @@ namespace sat {
 
     class i_local_search {
     public:
-        virtual ~i_local_search() {}
+        virtual ~i_local_search() = default;
         virtual void add(solver const& s) = 0;
         virtual void updt_params(params_ref const& p) = 0;
         virtual void set_seed(unsigned s) = 0;

src/sat/smt/q_mam.h

@@ -45,7 +45,7 @@ namespace q {
 
         static mam * mk(euf::solver& ctx, ematch& em);
         
-        virtual ~mam() {}
+        virtual ~mam() = default;
         
         virtual void add_pattern(quantifier * q, app * mp) = 0;
 

src/sat/smt/q_model_fixer.h

@@ -43,7 +43,7 @@ namespace q {
         ast_manager& m;
     public:
         projection_function(ast_manager& m) : m(m) {}
-        virtual ~projection_function() {}
+        virtual ~projection_function() = default;
         virtual expr* mk_lt(expr* a, expr* b) = 0;
         expr* mk_le(expr* a, expr* b) { return m.mk_not(mk_lt(b, a)); }
         virtual bool operator()(expr* a, expr* b) const = 0;

src/sat/smt/sat_internalizer.h

@@ -21,7 +21,7 @@ Author:
 namespace sat {
     class sat_internalizer {
     public:
-        virtual ~sat_internalizer() {}
+        virtual ~sat_internalizer() = default;
         virtual bool is_bool_op(expr* e) const = 0;
         virtual literal internalize(expr* e, bool learned) = 0;
         virtual bool_var to_bool_var(expr* e) = 0;

src/sat/smt/sat_th.h

@@ -39,7 +39,7 @@ namespace euf {
         virtual bool post_visit(expr* e, bool sign, bool root) { return false; }
 
     public:
-        virtual ~th_internalizer() {}
+        virtual ~th_internalizer() = default;
 
         virtual sat::literal internalize(expr* e, bool sign, bool root, bool redundant) = 0;
 
@@ -60,7 +60,7 @@ namespace euf {
 
     class th_decompile {
     public:
-        virtual ~th_decompile() {}
+        virtual ~th_decompile() = default;
 
         virtual bool to_formulas(std::function<expr_ref(sat::literal)>& lit2expr, expr_ref_vector& fmls) { return false; }
     };
@@ -68,7 +68,7 @@ namespace euf {
     class th_model_builder {
     public:
 
-        virtual ~th_model_builder() {}
+        virtual ~th_model_builder() = default;
 
         /**
            \brief compute the value for enode \c n and store the value in \c values

src/smt/mam.h

@@ -37,8 +37,7 @@ namespace smt {
             m_context(ctx) {
         }
         
-        virtual ~mam() {
-        }
+        virtual ~mam() = default;
         
         virtual void add_pattern(quantifier * q, app * mp) = 0;
 

src/smt/smt_case_split_queue.h

@@ -45,7 +45,7 @@ namespace smt {
         virtual void pop_scope(unsigned num_scopes) = 0;
         virtual void next_case_split(bool_var & next, lbool & phase) = 0;
         virtual void display(std::ostream & out) = 0;
-        virtual ~case_split_queue() {}
+        virtual ~case_split_queue() = default;
 
         // theory-aware branching hint
         virtual void add_theory_aware_branching_info(bool_var v, double priority, lbool phase) {}

src/smt/smt_clause.h

@@ -33,7 +33,7 @@ namespace smt {
     */
     class clause_del_eh {
     public:
-        virtual ~clause_del_eh() {}
+        virtual ~clause_del_eh() = default;
         virtual void operator()(ast_manager & m, clause * cls) = 0;
     };
 

src/smt/smt_for_each_relevant_expr.h

@@ -65,7 +65,7 @@ namespace smt {
 
     public:
         for_each_relevant_expr(context & ctx);
-        virtual ~for_each_relevant_expr() {}
+        virtual ~for_each_relevant_expr() = default;
         /**
            \brief Visit the relevant sub-expressions of n.
            That is, only subexpressions m of n, such that m_context.is_relevant(m).

src/smt/smt_justification.h

@@ -49,7 +49,7 @@ namespace smt {
         unsigned m_in_region:1; // true if the object was allocated in a region.
     public:
         justification(bool in_region = true):m_mark(false), m_in_region(in_region) {}
-        virtual ~justification() {}
+        virtual ~justification() = default;
 
         /**
            \brief This method should return true if the method del_eh needs to be invoked 

src/smt/smt_model_finder.cpp

@@ -1157,7 +1157,7 @@ namespace smt {
             ast_manager& m;
         public:
             qinfo(ast_manager& m) :m(m) {}
-            virtual ~qinfo() {}
+            virtual ~qinfo() = default;
             virtual char const* get_kind() const = 0;
             virtual bool is_equal(qinfo const* qi) const = 0;
             virtual void display(std::ostream& out) const { out << "[" << get_kind() << "]"; }

src/smt/smt_model_generator.h

@@ -136,7 +136,7 @@ namespace smt {
     */
     class model_value_proc {
     public:
-        virtual ~model_value_proc() {}
+        virtual ~model_value_proc() = default;
         /**
            \brief Fill result with the dependencies of this functor.
            That is, to invoke mk_value, the dependencies in result must be constructed.

src/smt/smt_quantifier.h

@@ -106,7 +106,7 @@ namespace smt {
 
     class quantifier_manager_plugin {
     public:
-        virtual ~quantifier_manager_plugin() {}
+        virtual ~quantifier_manager_plugin() = default;
 
         virtual void set_manager(quantifier_manager & qm) = 0;
 

src/smt/smt_relevancy.h

@@ -29,7 +29,7 @@ namespace smt {
         void mark_as_relevant(relevancy_propagator & rp, expr * n);
         void mark_args_as_relevant(relevancy_propagator & rp, app * n);
     public:
-        virtual ~relevancy_eh() {}
+        virtual ~relevancy_eh() = default;
         /**
            \brief This method is invoked when n is marked as relevant.
         */
@@ -87,7 +87,7 @@ namespace smt {
         context & m_context;
     public:
         relevancy_propagator(context & ctx);
-        virtual ~relevancy_propagator() {}
+        virtual ~relevancy_propagator() = default;
 
         context & get_context() { return m_context; }
 

src/smt/theory_arith.h

@@ -294,7 +294,7 @@ namespace smt {
                 m_bound_kind(k),
                 m_atom(a) {
             }
-            virtual ~bound() {}
+            virtual ~bound() = default;
             theory_var get_var() const { return m_var; }
             bound_kind get_bound_kind() const { return static_cast<bound_kind>(m_bound_kind); }
             bool is_atom() const { return m_atom; }

src/smt/theory_bv.h

@@ -42,7 +42,7 @@ namespace smt {
 
         class atom {
         public:
-            virtual ~atom() {}
+            virtual ~atom() = default;
             virtual bool is_bit() const = 0;
         };
 

src/smt/theory_seq.h

@@ -222,7 +222,7 @@ namespace smt {
 
         class apply {
         public:
-            virtual ~apply() {}
+            virtual ~apply() = default;
             virtual void operator()(theory_seq& th) = 0;
         };
 

src/solver/check_sat_result.h

@@ -45,7 +45,7 @@ protected:
     double      m_time;
 public:
     check_sat_result():m_ref_count(0), m_status(l_undef), m_time(0) {}
-    virtual ~check_sat_result() {}
+    virtual ~check_sat_result() = default;
     void inc_ref() { m_ref_count++; }
     void dec_ref() { SASSERT(m_ref_count > 0); m_ref_count--; if (m_ref_count == 0) dealloc(this); }
     lbool set_status(lbool r) { return m_status = r; }

src/solver/progress_callback.h

@@ -20,7 +20,7 @@ Revision History:
 
 class progress_callback {
 public:
-    virtual ~progress_callback() {}
+    virtual ~progress_callback() = default;
     
     // Called on every check for resource limit exceeded (much more frequent).
     virtual void fast_progress_sample() {}

src/solver/solver.h

@@ -29,7 +29,7 @@ class model_converter;
 
 class solver_factory {
 public:
-    virtual ~solver_factory() {}
+    virtual ~solver_factory() = default;
     virtual solver * operator()(ast_manager & m, params_ref const & p, bool proofs_enabled, bool models_enabled, bool unsat_core_enabled, symbol const & logic) = 0;
 };
 
@@ -113,7 +113,7 @@ public:
     virtual void set_phase(expr* e) = 0;
     virtual void move_to_front(expr* e) = 0; 
 
-    class phase { public: virtual ~phase() {} };
+    class phase { public: virtual ~phase() = default; };
     
     virtual phase* get_phase() = 0;
 

src/tactic/bv/bv_bound_chk_tactic.cpp

@@ -147,7 +147,7 @@ public:
     imp(ast_manager & m, params_ref const & p, bv_bound_chk_stats& stats)
         : m_rw(m, p, stats) {    }
 
-    virtual ~imp() {    }
+    virtual ~imp() = default;
 
     ast_manager& m() { return m_rw.m(); }
 

src/tactic/converter.h

@@ -26,7 +26,7 @@ class converter {
     unsigned m_ref_count;
 public:
     converter():m_ref_count(0) {}
-    virtual ~converter() {}
+    virtual ~converter() = default;
 
     void inc_ref() { ++m_ref_count;  }
 

src/tactic/core/ctx_simplify_tactic.h

@@ -26,7 +26,7 @@ public:
     class simplifier {
         goal_num_occurs* m_occs;
     public:
-        virtual ~simplifier() {}
+        virtual ~simplifier() = default;
         virtual bool assert_expr(expr * t, bool sign) = 0;
         virtual bool simplify(expr* t, expr_ref& result) = 0;
         virtual bool may_simplify(expr* t) { return true; }

src/tactic/core/dom_simplify_tactic.h

@@ -64,7 +64,7 @@ public:
 
 class dom_simplifier {
  public:
-    virtual ~dom_simplifier() {}
+    virtual ~dom_simplifier() = default;
     /**
        \brief assert_expr performs an implicit push
     */

src/tactic/probe.h

@@ -44,7 +44,7 @@ private:
 
 public:
     probe():m_ref_count(0) {}
-    virtual ~probe() {}
+    virtual ~probe() = default;
 
     void inc_ref() { ++m_ref_count; }
     void dec_ref() { SASSERT(m_ref_count > 0); --m_ref_count; if (m_ref_count == 0) dealloc(this); }

src/tactic/user_propagator_base.h

@@ -53,7 +53,7 @@ namespace user_propagator {
     class core {
     public:
 
-        virtual ~core() {}
+        virtual ~core() = default;
         
         virtual void user_propagate_init(
             void* ctx, 

src/test/ex.cpp

@@ -21,7 +21,7 @@ Revision History:
 
 class ex {
 public:
-    virtual ~ex() {}
+    virtual ~ex() = default;
     virtual char const * msg() const = 0;
 };
 

src/util/cmd_context_types.h

@@ -87,7 +87,7 @@ protected:
     int    m_pos;
 public:
     cmd(char const * n):m_name(n), m_line(0), m_pos(0) {}
-    virtual ~cmd() {}
+    virtual ~cmd() = default;
     virtual void reset(cmd_context & ctx) {}
     virtual void finalize(cmd_context & ctx) {}
     virtual symbol get_name() const { return m_name; }

src/util/event_handler.h

@@ -31,7 +31,7 @@ protected:
     event_handler_caller_t m_caller_id;
 public:
     event_handler(): m_caller_id(UNSET_EH_CALLER) {}
-    virtual ~event_handler() {}
+    virtual ~event_handler() = default;
     virtual void operator()(event_handler_caller_t caller_id) = 0;
     event_handler_caller_t caller_id() const { return m_caller_id; }
 };

src/util/trail.h

@@ -26,7 +26,7 @@ Revision History:
 
 class trail {
 public:
-    virtual ~trail() {}
+    virtual ~trail() = default;
     virtual void undo() = 0;
 };
 

src/util/z3_exception.h

@@ -22,7 +22,7 @@ Notes:
 
 class z3_exception {
 public:
-    virtual ~z3_exception() {}
+    virtual ~z3_exception() = default;
     virtual char const * msg() const = 0;
     virtual unsigned error_code() const;
     bool has_error_code() const;