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diff --git a/src/moof/debug.hh b/src/moof/debug.hh
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--- /dev/null
+++ b/src/moof/debug.hh
@@ -0,0 +1,41 @@
+
+/*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
+**]  All rights reserved.
+*
+* vi:ts=4 sw=4 tw=75
+*
+* Distributable under the terms and conditions of the 2-clause BSD license;
+* see the file COPYING for a complete text of the license.
+*
+**************************************************************************/
+
+#ifndef _MOOF_DEBUG_HH_
+#define _MOOF_DEBUG_HH_
+
+/**
+ * \file debug.hh
+ * Debugging facilities.
+ */
+
+#include <cstdlib>		// exit
+
+#include <moof/log.hh>
+
+
+#undef ASSERT
+#if NDEBUG
+#define ASSERT(X)
+#else
+/**
+ * Macro which tests an assertion and issues a log_error() and exits if the
+ * assertion is false.
+ * \param X test to perform.
+ */
+#define ASSERT(X) if (!(X)) moof::log_error \
+	<< "false assertion at " << __FILE__ << ":" << __LINE__ << ", " \
+	<< #X, exit(1)
+#endif
+
+
+#endif // _MOOF_DEBUG_HH_
+