add opt_solver layer

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/opt/opt_solver.h

@@ -0,0 +1,66 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    smt_solver.h
+
+Abstract:
+
+    Wraps smt::kernel as a solver for the external API and cmd_context.
+
+Author:
+
+    Leonardo (leonardo) 2012-10-21
+
+Notes:
+   
+    Variant of smt_solver that exposes kernel object.
+--*/
+#ifndef _OPT_SOLVER_H_
+#define _OPT_SOLVER_H_
+
+#include"ast.h"
+#include"params.h"
+#include"solver_na2as.h"
+#include"smt_kernel.h"
+#include"smt_params.h"
+#include"smt_types.h"
+
+namespace opt {
+
+    class opt_solver : public solver_na2as {
+        smt_params          m_params;
+        smt::kernel         m_context;
+        progress_callback * m_callback;
+        symbol              m_logic;
+        bool                m_objective_enabled;
+        smt::theory_var     m_objective_var;
+    public:
+        opt_solver(ast_manager & m, params_ref const & p, symbol const & l);
+        virtual ~opt_solver();
+
+        virtual void updt_params(params_ref const & p);
+        virtual void collect_param_descrs(param_descrs & r);
+        virtual void collect_statistics(statistics & st) const;
+        virtual void assert_expr(expr * t);
+        virtual void push_core();
+        virtual void pop_core(unsigned n);
+        virtual lbool check_sat_core(unsigned num_assumptions, expr * const * assumptions);
+        virtual void get_unsat_core(ptr_vector<expr> & r);
+        virtual void get_model(model_ref & m);
+        virtual proof * get_proof();
+        virtual std::string reason_unknown() const;
+        virtual void get_labels(svector<symbol> & r);
+        virtual void set_cancel(bool f);
+        virtual void set_progress_callback(progress_callback * callback);
+        virtual unsigned get_num_assertions() const;
+        virtual expr * get_assertion(unsigned idx) const;
+        virtual void display(std::ostream & out) const;
+
+        void set_objective(app* term);
+        void toggle_objective(bool enable);
+    };
+}
+
+#endif