Z3 sources

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

lib/base_simplifier.h

@@ -0,0 +1,54 @@
+/*++
+Copyright (c) 2007 Microsoft Corporation
+
+Module Name:
+
+    base_simplifier.h
+
+Abstract:
+
+    Base class for expression simplifier functors.
+
+Author:
+
+    Leonardo (leonardo) 2008-01-11
+
+Notes:
+
+--*/
+#ifndef _BASE_SIMPLIFIER_H_
+#define _BASE_SIMPLIFIER_H_
+
+#include"expr_map.h"
+
+/**
+   \brief Implements basic functionality used by expression simplifiers.
+*/
+class base_simplifier {
+protected:
+    ast_manager &                  m_manager;
+    expr_map                       m_cache;
+    ptr_vector<expr>               m_todo;
+
+    void cache_result(expr * n, expr * r, proof * p) { m_cache.insert(n, r, p); }
+    void reset_cache() { m_cache.reset(); }
+    void flush_cache() { m_cache.flush(); }
+    void get_cached(expr * n, expr * & r, proof * & p) const { m_cache.get(n, r, p); }
+
+    void visit(expr * n, bool & visited) {
+        if (!is_cached(n)) {
+            m_todo.push_back(n);
+            visited = false;
+        }
+    }
+
+public:
+    base_simplifier(ast_manager & m):
+        m_manager(m),
+        m_cache(m, m.fine_grain_proofs()) {
+    }
+    bool is_cached(expr * n) const {  return m_cache.contains(n); }
+    ast_manager & get_manager() { return m_manager; }
+};
+
+#endif /* _BASE_SIMPLIFIER_H_ */