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/** @file
* IPRT / No-CRT - Minimal type_traits C++ header.
*/
/*
* Copyright (C) 2022-2025 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 */
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