Create placeholders to optimization methods

src/opt/opt_context.h

@@ -0,0 +1,66 @@
+/*++
+Copyright (c) 2013 Microsoft Corporation
+
+Module Name:
+
+    opt_context.h
+
+Abstract:
+    Facility for running optimization problem.
+
+Author:
+
+    Anh-Dung Phan (t-anphan) 2013-10-16
+
+Notes:
+
+--*/
+#ifndef _OPT_CONTEXT_H_
+#define _OPT_CONTEXT_H_
+
+#include "ast.h"
+
+namespace opt {
+
+    class context {
+        ast_manager& m;
+        expr_ref_vector m_hard_constraints;
+        expr_ref_vector  m_soft_constraints;
+        vector<rational> m_weights;
+
+        expr_ref_vector m_objectives;
+        svector<bool>   m_is_max;
+
+    public:
+        context(ast_manager& m):
+            m(m),
+            m_hard_constraints(m),
+            m_soft_constraints(m),
+            m_objectives(m)
+        {}
+
+        void add_soft_constraint(expr* f, rational const& w) {
+            m_soft_constraints.push_back(f);
+            m_weights.push_back(w);
+        }
+
+        void add_objective(expr* t, bool is_max) {
+            m_objectives.push_back(t);
+            m_is_max.push_back(is_max);
+        }
+
+        void add_hard_constraint(expr* f) {
+            m_hard_constraints.push_back(f);
+        }
+
+        void optimize();
+
+    private:
+        bool is_maxsat_problem() const;
+
+    };
+
+
+}
+
+#endif