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diff --git a/include/VBox/com/assert.h b/include/VBox/com/assert.h
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+/** @file
+ * MS COM / XPCOM Abstraction Layer - Assertion macros for COM/XPCOM.
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef VBOX_INCLUDED_com_assert_h
+#define VBOX_INCLUDED_com_assert_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/assert.h>
+
+/** @defgroup grp_com_assert    Assertion Macros for COM/XPCOM
+ * @ingroup grp_com
+ * @{
+ */
+
+
+/**
+ *  Asserts that the COM result code is succeeded in strict builds.
+ *  In non-strict builds the result code will be NOREF'ed to kill compiler warnings.
+ *
+ *  @param hrc      The COM result code
+ */
+#define AssertComRC(hrc) \
+    do { AssertMsg(SUCCEEDED(hrc), ("COM RC = %Rhrc (0x%08X)\n", hrc, hrc)); NOREF(hrc); } while (0)
+
+/**
+ *  Same as AssertComRC, except the caller already knows we failed.
+ *
+ *  @param hrc      The COM result code
+ */
+#define AssertComRCFailed(hrc) \
+    do { AssertMsgFailed(("COM RC = %Rhrc (0x%08X)\n", hrc, hrc)); NOREF(hrc); } while (0)
+
+/**
+ *  A special version of AssertComRC that returns the given expression
+ *  if the result code is failed.
+ *
+ *  @param hrc      The COM result code
+ *  @param RetExpr  The expression to return
+ */
+#define AssertComRCReturn(hrc, RetExpr) \
+    AssertMsgReturn(SUCCEEDED(hrc), ("COM RC = %Rhrc (0x%08X)\n", hrc, hrc), RetExpr)
+
+/**
+ *  A special version of AssertComRC that returns the given result code
+ *  if it is failed.
+ *
+ *  @param hrc      The COM result code
+ */
+#define AssertComRCReturnRC(hrc) \
+    AssertMsgReturn(SUCCEEDED(hrc), ("COM RC = %Rhrc (0x%08X)\n", hrc, hrc), hrc)
+
+/**
+ *  A special version of AssertComRC that returns if the result code is failed.
+ *
+ *  @param hrc      The COM result code
+ */
+#define AssertComRCReturnVoid(hrc) \
+    AssertMsgReturnVoid(SUCCEEDED(hrc), ("COM RC = %Rhrc (0x%08X)\n", hrc, hrc))
+
+/**
+ *  A special version of AssertComRC that evaluates the given expression and
+ *  breaks if the result code is failed.
+ *
+ *  @param hrc          The COM result code
+ *  @param PreBreakExpr The expression to evaluate on failure.
+ */
+#define AssertComRCBreak(hrc, PreBreakExpr) \
+    if (!SUCCEEDED(hrc)) { AssertComRCFailed(hrc); PreBreakExpr; break; } else do {} while (0)
+
+/**
+ *  A special version of AssertComRC that evaluates the given expression and
+ *  throws it if the result code is failed.
+ *
+ *  @param hrc          The COM result code
+ *  @param ThrowMeExpr  The expression which result to be thrown on failure.
+ */
+#define AssertComRCThrow(hrc, ThrowMeExpr) \
+    do { if (SUCCEEDED(hrc)) { /*likely*/} else { AssertComRCFailed(hrc); throw (ThrowMeExpr); } } while (0)
+
+/**
+ *  A special version of AssertComRC that just breaks if the result code is
+ *  failed.
+ *
+ *  @param hrc      The COM result code
+ */
+#define AssertComRCBreakRC(hrc) \
+    if (!SUCCEEDED(hrc)) { AssertComRCFailed(hrc); break; } else do {} while (0)
+
+/**
+ *  A special version of AssertComRC that just throws @a hrc if the result code
+ *  is failed.
+ *
+ *  @param hrc      The COM result code
+ */
+#define AssertComRCThrowRC(hrc) \
+    do { if (SUCCEEDED(hrc)) { /*likely*/ } else { AssertComRCFailed(hrc); throw hrc; } } while (0)
+
+/** @} */
+
+#endif /* !VBOX_INCLUDED_com_assert_h */
+