Z3 sources

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

lib/sat_cleaner.h

@@ -0,0 +1,53 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    sat_cleaner.h
+
+Abstract:
+
+    Eliminate satisfied clauses, and literals assigned to false.
+
+Author:
+
+    Leonardo de Moura (leonardo) 2011-05-24.
+
+Revision History:
+
+--*/
+#ifndef _SAT_CLEANER_H_
+#define _SAT_CLEANER_H_
+
+#include"sat_types.h"
+#include"statistics.h"
+
+namespace sat {
+
+    class cleaner {
+        struct report;
+
+        solver & s;
+        unsigned m_last_num_units;
+        int      m_cleanup_counter;
+
+        // stats
+        unsigned m_elim_clauses;
+        unsigned m_elim_literals;
+
+        void cleanup_watches();
+        void cleanup_clauses(clause_vector & cs);
+    public:
+        cleaner(solver & s);
+
+        bool operator()(bool force = false);
+
+        void collect_statistics(statistics & st);
+        void reset_statistics();
+
+        void dec() { m_cleanup_counter--; }
+    };
+
+};
+
+#endif