include more qsat features

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

src/qe/qe_mbp.h

@@ -0,0 +1,76 @@
+/*++
+Copyright (c) 2015 Microsoft Corporation
+
+Module Name:
+
+    qe_mbp.h
+
+Abstract:
+
+    Model-based projection utilities
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2015-5-28
+
+Revision History:
+
+
+--*/
+
+#ifndef __QE_MBP_H__
+#define __QE_MBP_H__
+
+#include "ast.h"
+#include "params.h"
+#include "model.h"
+
+
+namespace qe {
+
+    struct cant_project {};
+
+    class project_plugin {
+    public:
+        virtual ~project_plugin() {}
+        virtual bool operator()(model& model, app* var, app_ref_vector& vars, expr_ref_vector& lits) = 0;
+        virtual bool solve(model& model, app_ref_vector& vars, expr_ref_vector& lits) = 0;
+        virtual family_id get_family_id() = 0;
+
+        static expr_ref pick_equality(ast_manager& m, model& model, expr* t);
+        static void partition_values(model& model, expr_ref_vector const& vals, expr_ref_vector& lits);
+        static void partition_args(model& model, app_ref_vector const& sels, expr_ref_vector& lits);
+        static void erase(expr_ref_vector& lits, unsigned& i);
+        static void push_back(expr_ref_vector& lits, expr* lit);
+    };
+
+    class mbp {
+        class impl;
+        impl * m_impl;
+    public:
+        mbp(ast_manager& m);
+        
+        ~mbp();
+        
+        /**
+           \brief
+           Apply model-based qe on constants provided as vector of variables. 
+           Return the updated formula and updated set of variables that were not eliminated.           
+        */
+        void operator()(bool force_elim, app_ref_vector& vars, model& mdl, expr_ref_vector& fmls);
+
+        /**
+           \brief
+           Solve as many variables as possible using "cheap" quantifier elimination"
+        */
+        void solve(model& model, app_ref_vector& vars, expr_ref_vector& lits);
+
+        /**
+           \brief 
+           Extract literals from formulas based on model.
+         */
+        void extract_literals(model& model, expr_ref_vector& lits);
+    };
+}
+
+#endif