Z3 sources

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

lib/cost_evaluator.h

@@ -0,0 +1,43 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    cost_evaluator.h
+
+Abstract:
+
+    Simple evaluator for cost function
+
+Author:
+
+    Leonardo de Moura (leonardo) 2008-06-14.
+
+Revision History:
+
+--*/
+#ifndef _COST_EVALUATOR_H_
+#define _COST_EVALUATOR_H_
+
+#include"ast.h"
+#include"arith_decl_plugin.h"
+
+class cost_evaluator {
+    ast_manager &   m_manager;
+    arith_util      m_util;
+    unsigned        m_num_args;
+    float const *   m_args;
+    float eval(expr * f) const;
+public:
+    cost_evaluator(ast_manager & m);
+    /**
+       I'm using the same standard used in quantifier instantiation.
+       (VAR 0) is stored in the last position of the array.
+       ...
+       (VAR (num_args - 1)) is stored in the first position of the array.
+    */
+    float operator()(expr * f, unsigned num_args, float const * args);
+};
+
+#endif /* _COST_EVALUATOR_H_ */
+