Z3 sources

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

lib/uses_theory.h

@@ -0,0 +1,37 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    uses_theory.h
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Leonardo de Moura (leonardo) 2008-10-21.
+
+Revision History:
+
+--*/
+#ifndef _USES_THEORY_H_
+#define _USES_THEORY_H_
+
+#include"ast.h"
+
+/**
+   \brief Return true if the given expression contains a symbol of the given theory.
+*/
+bool uses_theory(expr * n, family_id fid);
+
+/**
+    \brief Return true if the given expression contains a symbol of the given theory.
+    Only the expressions not marked as visited are checked. The set visited is updated 
+    with the new checked expressions.
+*/
+bool uses_theory(expr * n, family_id fid, expr_mark & visited);
+
+#endif /* _USES_THEORY_H_ */
+