Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 115 insertions, 0 deletions

diff --git a/include/iprt/cpp/meta.h b/include/iprt/cpp/meta.h
new file mode 100644
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--- /dev/null
+++ b/include/iprt/cpp/meta.h
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+/** @file
+ * IPRT - C++ Meta programming.
+ */
+
+/*
+ * Copyright (C) 2011-2020 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 IPRT_INCLUDED_cpp_meta_h
+#define IPRT_INCLUDED_cpp_meta_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/types.h>
+
+/** @defgroup grp_rt_cpp_meta   C++ Meta programming utilities
+ * @ingroup grp_rt_cpp
+ * @{
+ */
+
+/**
+ * Check for a condition on compile time and dependent of the result TrueResult
+ * or FalseResult will be defined.
+ *
+ * @param   Condition     Condition to check.
+ * @param   TrueResult    Result when condition is true.
+ * @param   FalseResult   Result when condition is false
+ */
+template <bool Condition, typename TrueResult, typename FalseResult>
+struct RTCIf;
+
+/**
+ * Check for a condition on compile time and dependent of the result TrueResult
+ * or FalseResult will be defined.
+ *
+ * True specialization of RTCIf.
+ *
+ * @param   TrueResult    Result when condition is true.
+ * @param   FalseResult   Result when condition is false
+ */
+template <typename TrueResult, typename FalseResult>
+struct RTCIf<true, TrueResult, FalseResult>
+{
+    typedef TrueResult result;
+};
+
+/**
+ * Check for a condition on compile time and dependent of the result TrueResult
+ * or FalseResult will be defined.
+ *
+ * False specialization of RTCIf.
+ *
+ * @param   TrueResult    Result when condition is true.
+ * @param   FalseResult   Result when condition is false
+ */
+template <typename TrueResult, typename FalseResult>
+struct RTCIf<false, TrueResult, FalseResult>
+{
+    typedef FalseResult result;
+};
+
+/**
+ * Check if @a T is a pointer or not at compile time and dependent of the
+ * result TrueResult or FalseResult will be defined.
+ *
+ * False version of RTCIfPtr.
+ *
+ * @param   Condition     Condition to check.
+ * @param   TrueResult    Result when condition is true.
+ * @param   FalseResult   Result when condition is false
+ */
+template <class T, typename TrueResult, typename FalseResult>
+struct RTCIfPtr
+{
+    typedef FalseResult result;
+};
+
+/**
+ * Check if @a T is a pointer or not at compile time and dependent of the
+ * result TrueResult or FalseResult will be defined.
+ *
+ * True specialization of RTCIfPtr.
+ *
+ * @param   Condition     Condition to check.
+ * @param   TrueResult    Result when condition is true.
+ * @param   FalseResult   Result when condition is false
+ */
+template <class T, typename TrueResult, typename FalseResult>
+struct RTCIfPtr<T*, TrueResult, FalseResult>
+{
+    typedef TrueResult result;
+};
+
+/** @} */
+
+#endif /* !IPRT_INCLUDED_cpp_meta_h */
+