Use = default for virtual constructors.

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