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| -rw-r--r-- | include/iprt/cpp/meta.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/include/iprt/cpp/meta.h b/include/iprt/cpp/meta.h new file mode 100644 index 00000000..e6b9796e --- /dev/null +++ b/include/iprt/cpp/meta.h @@ -0,0 +1,125 @@ +/** @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 */ + |