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Diffstat (limited to 'include/iprt/nocrt/type_traits')
-rw-r--r-- | include/iprt/nocrt/type_traits | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/include/iprt/nocrt/type_traits b/include/iprt/nocrt/type_traits new file mode 100644 index 00000000..c8c35b2f --- /dev/null +++ b/include/iprt/nocrt/type_traits @@ -0,0 +1,88 @@ +/** @file + * IPRT / No-CRT - Minimal type_traits C++ header. + */ + +/* + * Copyright (C) 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 VBOX_INCLUDED_SRC_nocrt_type_traits +#define VBOX_INCLUDED_SRC_nocrt_type_traits +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cdefs.h> + +namespace std +{ + /* + * std::integral_constant + */ + template<typename a_Type, a_Type a_Value> + struct integral_constant + { + static constexpr a_Type value = a_Value; + typedef a_Type value_type; + typedef integral_constant<a_Type, a_Value> type; + constexpr operator value_type() const RT_NOEXCEPT { return value; } + /** @todo operator()() for 2014+ */ + }; + template<typename a_Type, a_Type a_Value> constexpr a_Type integral_constant<a_Type, a_Value>::value; + + /* Helper: */ + template<bool a_Value> using bool_constant = integral_constant<bool, a_Value>; + + /* Specializations: */ + typedef integral_constant<bool, true> true_type; + typedef integral_constant<bool, false> false_type; + + + /* + * std::is_enum + */ + template<typename a_Type> struct is_enum + : integral_constant<bool, __is_enum(a_Type) /* compiler (clan, gcc, msc) builtin */ > + { }; + + /* + * std::underlying_type + */ + template<typename a_Type> struct underlying_type + { + using type = __underlying_type(a_Type); /* compiler (clan, gcc, msc) builtin */ + }; + + template<typename a_Type> using underlying_type_t = typename underlying_type<a_Type>::type; + +} + +#endif /* !VBOX_INCLUDED_SRC_nocrt_type_traits */ + |