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/** @file
* IPRT - C++ Meta programming.
*/
/*
* Copyright (C) 2011-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#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 */
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