From 9c77fbc2a9128420dd5366b9d9a1ff572520e72b Mon Sep 17 00:00:00 2001
From: Nikolaj Bjorner <nbjorner@microsoft.com>
Date: Wed, 26 Aug 2020 11:26:10 -0700
Subject: [PATCH] use virtual destructors

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
---
 src/sat/ba/ba_internalize.h | 1 +
 src/sat/euf/euf_solver.h    | 1 +
 src/sat/smt/sat_smt.h       | 1 +
 3 files changed, 3 insertions(+)

diff --git a/src/sat/ba/ba_internalize.h b/src/sat/ba/ba_internalize.h
index eb81486b2..6591e5968 100644
--- a/src/sat/ba/ba_internalize.h
+++ b/src/sat/ba/ba_internalize.h
@@ -46,6 +46,7 @@ namespace sat {
         literal internalize_xor(expr* e, bool sign, bool root);
     public:
         ba_internalize(ba_solver& ba, solver_core& s, ast_manager& m) : m(m), pb(m), ba(ba), m_solver(s) {}
+        ~ba_internalize() override {}
         literal internalize(sat_internalizer& si, expr* e, bool sign, bool root) override;
         
     };
diff --git a/src/sat/euf/euf_solver.h b/src/sat/euf/euf_solver.h
index 3dd36fcac..0bc7bbf86 100644
--- a/src/sat/euf/euf_solver.h
+++ b/src/sat/euf/euf_solver.h
@@ -93,6 +93,7 @@ namespace euf {
             m_eq_idx(this, 1),
             m_lit_idx(this, 2)
         {}
+        ~solver() override {}
 
         void set_solver(sat::solver* s) override { m_solver = s; }
         void set_lookahead(sat::lookahead* s) override { m_lookahead = s; }
diff --git a/src/sat/smt/sat_smt.h b/src/sat/smt/sat_smt.h
index 9a2f9d1d0..fe0f7e11d 100644
--- a/src/sat/smt/sat_smt.h
+++ b/src/sat/smt/sat_smt.h
@@ -49,6 +49,7 @@ namespace sat {
     class th_internalizer {
     public:
         virtual literal internalize(sat_internalizer& si, expr* e, bool sign, bool root) = 0;
+        virtual ~th_internalizer() {}
     };
 
     class index_base {