125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/** @file
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* IPRT - C++ Meta programming.
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*/
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/*
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* Copyright (C) 2011-2023 Oracle and/or its affiliates.
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*
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* This file is part of VirtualBox base platform packages, as
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* available from https://www.virtualbox.org.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, in version 3 of the
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* License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses>.
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*
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* The contents of this file may alternatively be used under the terms
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* of the Common Development and Distribution License Version 1.0
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* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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* in the VirtualBox distribution, in which case the provisions of the
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* CDDL are applicable instead of those of the GPL.
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*
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* You may elect to license modified versions of this file under the
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* terms and conditions of either the GPL or the CDDL or both.
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*
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* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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*/
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#ifndef IPRT_INCLUDED_cpp_meta_h
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#define IPRT_INCLUDED_cpp_meta_h
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#ifndef RT_WITHOUT_PRAGMA_ONCE
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# pragma once
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#endif
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#include <iprt/types.h>
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/** @defgroup grp_rt_cpp_meta C++ Meta programming utilities
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* @ingroup grp_rt_cpp
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* @{
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*/
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/**
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* Check for a condition on compile time and dependent of the result TrueResult
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* or FalseResult will be defined.
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*
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* @param Condition Condition to check.
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* @param TrueResult Result when condition is true.
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* @param FalseResult Result when condition is false
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*/
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template <bool Condition, typename TrueResult, typename FalseResult>
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struct RTCIf;
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/**
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* Check for a condition on compile time and dependent of the result TrueResult
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* or FalseResult will be defined.
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*
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* True specialization of RTCIf.
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*
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* @param TrueResult Result when condition is true.
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* @param FalseResult Result when condition is false
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*/
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template <typename TrueResult, typename FalseResult>
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struct RTCIf<true, TrueResult, FalseResult>
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{
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typedef TrueResult result;
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};
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/**
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* Check for a condition on compile time and dependent of the result TrueResult
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* or FalseResult will be defined.
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*
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* False specialization of RTCIf.
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*
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* @param TrueResult Result when condition is true.
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* @param FalseResult Result when condition is false
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*/
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template <typename TrueResult, typename FalseResult>
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struct RTCIf<false, TrueResult, FalseResult>
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{
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typedef FalseResult result;
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};
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/**
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* Check if @a T is a pointer or not at compile time and dependent of the
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* result TrueResult or FalseResult will be defined.
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*
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* False version of RTCIfPtr.
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*
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* @param Condition Condition to check.
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* @param TrueResult Result when condition is true.
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* @param FalseResult Result when condition is false
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*/
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template <class T, typename TrueResult, typename FalseResult>
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struct RTCIfPtr
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{
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typedef FalseResult result;
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};
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/**
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* Check if @a T is a pointer or not at compile time and dependent of the
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* result TrueResult or FalseResult will be defined.
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*
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* True specialization of RTCIfPtr.
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*
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* @param Condition Condition to check.
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* @param TrueResult Result when condition is true.
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* @param FalseResult Result when condition is false
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*/
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template <class T, typename TrueResult, typename FalseResult>
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struct RTCIfPtr<T*, TrueResult, FalseResult>
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{
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typedef TrueResult result;
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};
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/** @} */
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#endif /* !IPRT_INCLUDED_cpp_meta_h */
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