Z3 sources

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

lib/spc_der.h

@@ -0,0 +1,52 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    spc_der.h
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Leonardo de Moura (leonardo) 2008-02-17.
+
+Revision History:
+
+--*/
+#ifndef _SPC_DER_H_
+#define _SPC_DER_H_
+
+#include"spc_clause.h"
+
+namespace spc {
+
+    /**
+       \brief Functor for applying destructive equality resolution.
+       This is similar to the Functor in der.h, but this one applies
+       the simplification on clauses instead of ast's.
+
+       x != s or R
+       ==>
+       sigma(R)
+       
+       where
+       sigma = mgu(x, s)
+    */
+    class der { 
+        ast_manager &   m_manager;
+        substitution    m_subst;
+        unsigned_vector m_to_keep;
+        family_id       m_spc_fid;
+        void apply(clause * cls, unsigned j, expr * lhs, expr * rhs);
+        bool apply(clause * cls);
+    public:
+        der(ast_manager & m);
+        void operator()(clause * cls);
+    };
+};
+
+#endif /* _SPC_DER_H_ */
+