Use = default for virtual constructors.

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;