mss and maxres tuning

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

src/opt/mss.h

@@ -0,0 +1,52 @@
+/*++
+Copyright (c) 2014 Microsoft Corporation
+
+Module Name:
+
+    mss.h
+
+Abstract:
+   
+    Maximal satisfying subset/minimal correction sets: MSS/MCS
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2014-2-8
+
+Notes:
+
+--*/
+#ifndef _MSS_H_
+#define _MSS_H_
+
+namespace opt {
+    class mss {
+        solver&       s;
+        ast_manager&  m;
+        volatile bool m_cancel;
+        typedef ptr_vector<expr> exprs;
+        typedef obj_hashtable<expr>  expr_set;
+        exprs         m_mss;
+        expr_set      m_mcs;
+        exprs         m_todo;
+        model_ref     m_model;
+    public:
+        mss(solver& s, ast_manager& m);
+        ~mss();
+        
+        lbool operator()(vector<ptr_vector<expr> > const& cores, ptr_vector<expr>& literals);
+                
+        void set_cancel(bool f) { m_cancel = f; }
+
+    private:
+        void  check_parameters(vector<exprs > const& cores, exprs& literals);
+        void  update_model();
+        void  update_set(exprs& lits);
+        lbool process_core(exprs const& _core);
+        lbool process_core(unsigned sz, exprs& core);
+        void display(std::ostream& out) const;
+    };
+
+};
+
+#endif