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source: vbox/trunk/include/iprt/nocrt/type_traits@ 103224

Last change on this file since 103224 was 98103, checked in by vboxsync, 22 months ago

Copyright year updates by scm.

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Line 
1/** @file
2 * IPRT / No-CRT - Minimal type_traits C++ header.
3 */
4
5/*
6 * Copyright (C) 2022-2023 Oracle and/or its affiliates.
7 *
8 * This file is part of VirtualBox base platform packages, as
9 * available from https://www.virtualbox.org.
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation, in version 3 of the
14 * License.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, see <https://www.gnu.org/licenses>.
23 *
24 * The contents of this file may alternatively be used under the terms
25 * of the Common Development and Distribution License Version 1.0
26 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
27 * in the VirtualBox distribution, in which case the provisions of the
28 * CDDL are applicable instead of those of the GPL.
29 *
30 * You may elect to license modified versions of this file under the
31 * terms and conditions of either the GPL or the CDDL or both.
32 *
33 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
34 */
35
36#ifndef VBOX_INCLUDED_SRC_nocrt_type_traits
37#define VBOX_INCLUDED_SRC_nocrt_type_traits
38#ifndef RT_WITHOUT_PRAGMA_ONCE
39# pragma once
40#endif
41
42#include <iprt/cdefs.h>
43
44namespace std
45{
46 /*
47 * std::integral_constant
48 */
49 template<typename a_Type, a_Type a_Value>
50 struct integral_constant
51 {
52 static constexpr a_Type value = a_Value;
53 typedef a_Type value_type;
54 typedef integral_constant<a_Type, a_Value> type;
55 constexpr operator value_type() const RT_NOEXCEPT { return value; }
56 /** @todo operator()() for 2014+ */
57 };
58 template<typename a_Type, a_Type a_Value> constexpr a_Type integral_constant<a_Type, a_Value>::value;
59
60 /* Helper: */
61 template<bool a_Value> using bool_constant = integral_constant<bool, a_Value>;
62
63 /* Specializations: */
64 typedef integral_constant<bool, true> true_type;
65 typedef integral_constant<bool, false> false_type;
66
67
68 /*
69 * std::is_enum
70 */
71 template<typename a_Type> struct is_enum
72 : integral_constant<bool, __is_enum(a_Type) /* compiler (clan, gcc, msc) builtin */ >
73 { };
74
75 /*
76 * std::underlying_type
77 */
78 template<typename a_Type> struct underlying_type
79 {
80 using type = __underlying_type(a_Type); /* compiler (clan, gcc, msc) builtin */
81 };
82
83 template<typename a_Type> using underlying_type_t = typename underlying_type<a_Type>::type;
84
85}
86
87#endif /* !VBOX_INCLUDED_SRC_nocrt_type_traits */
88
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