add sls-sms solver

src/ast/sls/sls_smt_solver.h

@@ -0,0 +1,46 @@
+/*++
+Copyright (c) 2024 Microsoft Corporation
+
+Module Name:
+
+    sls_smt_solver.h
+
+Abstract:
+
+    A Stochastic Local Search (SLS) Solver.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2024-07-10
+    
+--*/
+
+#pragma once
+#include "ast/sls/sls_context.h"
+#include "ast/sls/sat_ddfw.h"
+
+
+namespace sls {
+
+    class smt_solver {
+        ast_manager& m;
+        class solver_ctx;
+        sat::ddfw m_ddfw;
+        solver_ctx* m_solver_ctx = nullptr;        
+        expr_ref_vector m_assertions;
+        statistics m_st;
+        obj_map<expr, sat::bool_var> m_expr2var;
+
+        sat::literal mk_literal(expr* e);
+    public:
+        smt_solver(ast_manager& m, params_ref const& p);
+        ~smt_solver();
+        void assert_expr(expr* e);
+        lbool check();
+        model_ref get_model();
+        void updt_params(params_ref& p) {}
+        void collect_statistics(statistics& st) { st.copy(m_st); }
+        std::ostream& display(std::ostream& out);
+        void reset_statistics() { m_st.reset(); }
+    };
+}