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1 // -*- C++ -*-
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2 //===----------------------------------------------------------------------===//
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3 //
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4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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5 // See https://llvm.org/LICENSE.txt for license information.
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6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #ifndef _LIBCPP_CSTDDEF
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11 #define _LIBCPP_CSTDDEF
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12
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13 /*
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14 cstddef synopsis
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15
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16 Macros:
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17
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18 offsetof(type,member-designator)
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19 NULL
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20
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21 namespace std
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22 {
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23
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24 Types:
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25
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26 ptrdiff_t
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27 size_t
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28 max_align_t // C++11
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29 nullptr_t
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30 byte // C++17
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31
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32 } // std
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33
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34 */
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35
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36 #include <__assert> // all public C++ headers provide the assertion handler
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37 #include <__config>
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38 #include <__type_traits/enable_if.h>
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39 #include <__type_traits/integral_constant.h>
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40 #include <__type_traits/is_integral.h>
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41 #include <version>
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42
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43 #include <stddef.h>
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44
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45 #ifndef _LIBCPP_STDDEF_H
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46 # error <cstddef> tried including <stddef.h> but didn't find libc++'s <stddef.h> header. \
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47 This usually means that your header search paths are not configured properly. \
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48 The header search paths should contain the C++ Standard Library headers before \
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49 any C Standard Library, and you are probably using compiler flags that make that \
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50 not be the case.
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51 #endif
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52
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53 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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54 # pragma GCC system_header
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55 #endif
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56
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57 _LIBCPP_BEGIN_NAMESPACE_STD
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58
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59 using ::nullptr_t;
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60 using ::ptrdiff_t _LIBCPP_USING_IF_EXISTS;
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61 using ::size_t _LIBCPP_USING_IF_EXISTS;
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62
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63 #if !defined(_LIBCPP_CXX03_LANG)
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64 using ::max_align_t _LIBCPP_USING_IF_EXISTS;
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65 #endif
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66
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67 _LIBCPP_END_NAMESPACE_STD
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68
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69 #if _LIBCPP_STD_VER >= 17
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70 namespace std // purposefully not versioned
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71 {
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72 enum class byte : unsigned char {};
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73
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74 _LIBCPP_HIDE_FROM_ABI constexpr byte operator| (byte __lhs, byte __rhs) noexcept
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75 {
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76 return static_cast<byte>(
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77 static_cast<unsigned char>(
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78 static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs)
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79 ));
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80 }
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81
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82 _LIBCPP_HIDE_FROM_ABI constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept
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83 { return __lhs = __lhs | __rhs; }
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84
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85 _LIBCPP_HIDE_FROM_ABI constexpr byte operator& (byte __lhs, byte __rhs) noexcept
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86 {
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87 return static_cast<byte>(
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88 static_cast<unsigned char>(
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89 static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs)
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90 ));
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91 }
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92
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93 _LIBCPP_HIDE_FROM_ABI constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept
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94 { return __lhs = __lhs & __rhs; }
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95
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96 _LIBCPP_HIDE_FROM_ABI constexpr byte operator^ (byte __lhs, byte __rhs) noexcept
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97 {
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98 return static_cast<byte>(
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99 static_cast<unsigned char>(
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100 static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs)
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101 ));
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102 }
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103
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104 _LIBCPP_HIDE_FROM_ABI constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept
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105 { return __lhs = __lhs ^ __rhs; }
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106
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107 _LIBCPP_HIDE_FROM_ABI constexpr byte operator~ (byte __b) noexcept
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108 {
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109 return static_cast<byte>(
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110 static_cast<unsigned char>(
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111 ~static_cast<unsigned int>(__b)
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112 ));
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113 }
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114
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115 template <class _Tp>
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116 using _EnableByteOverload = __enable_if_t<is_integral<_Tp>::value, byte>;
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117
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118 template <class _Integer>
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119 _LIBCPP_HIDE_FROM_ABI constexpr _EnableByteOverload<_Integer> &
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120 operator<<=(byte& __lhs, _Integer __shift) noexcept
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121 { return __lhs = __lhs << __shift; }
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122
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123 template <class _Integer>
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124 _LIBCPP_HIDE_FROM_ABI constexpr _EnableByteOverload<_Integer>
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125 operator<< (byte __lhs, _Integer __shift) noexcept
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126 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); }
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127
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128 template <class _Integer>
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129 _LIBCPP_HIDE_FROM_ABI constexpr _EnableByteOverload<_Integer> &
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130 operator>>=(byte& __lhs, _Integer __shift) noexcept
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131 { return __lhs = __lhs >> __shift; }
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132
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133 template <class _Integer>
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134 _LIBCPP_HIDE_FROM_ABI constexpr _EnableByteOverload<_Integer>
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135 operator>> (byte __lhs, _Integer __shift) noexcept
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136 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); }
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137
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138 template <class _Integer, class = _EnableByteOverload<_Integer> >
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139 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Integer
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140 to_integer(byte __b) noexcept { return static_cast<_Integer>(__b); }
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141
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142 } // namespace std
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143
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144 #endif
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145
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146 #endif // _LIBCPP_CSTDDEF
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