Z3 sources

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

lib/progress_callback.h

@@ -0,0 +1,33 @@
+/*++
+Copyright (c) 2008 Microsoft Corporation
+
+Module Name:
+
+    progress_callback.h
+
+Abstract:
+
+    Virtual callback for reporting progress.
+
+Author:
+
+    Michal Moskal (micmo) 2009-02-17.
+
+Revision History:
+
+--*/
+#ifndef _PROGRESS_CALLBACK_H_
+#define _PROGRESS_CALLBACK_H_
+
+class progress_callback {
+public:
+    virtual ~progress_callback() {}
+    
+    // Called approx. every m_progress_sampling_freq miliseconds
+    virtual void slow_progress_sample() { }
+    
+    // Called on every check for reqsource limit exceeded (mach more frequent).
+    virtual void fast_progress_sample() { }
+};
+
+#endif