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