1// -*- C++ -*- 2//===--------------------------- cstddef ----------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_CSTDDEF 11#define _LIBCPP_CSTDDEF 12 13/* 14 cstddef synopsis 15 16Macros: 17 18 offsetof(type,member-designator) 19 NULL 20 21namespace std 22{ 23 24Types: 25 26 ptrdiff_t 27 size_t 28 max_align_t // C++11 29 nullptr_t 30 byte // C++17 31 32} // std 33 34*/ 35 36#include <__config> 37#include <version> 38 39#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 40#pragma GCC system_header 41#endif 42 43// Don't include our own <stddef.h>; we don't want to declare ::nullptr_t. 44#include_next <stddef.h> 45#include <__nullptr> 46 47_LIBCPP_BEGIN_NAMESPACE_STD 48 49using ::ptrdiff_t _LIBCPP_USING_IF_EXISTS; 50using ::size_t _LIBCPP_USING_IF_EXISTS; 51 52#if !defined(_LIBCPP_CXX03_LANG) 53using ::max_align_t _LIBCPP_USING_IF_EXISTS; 54#endif 55 56template <class _Tp> struct __libcpp_is_integral { enum { value = 0 }; }; 57template <> struct __libcpp_is_integral<bool> { enum { value = 1 }; }; 58template <> struct __libcpp_is_integral<char> { enum { value = 1 }; }; 59template <> struct __libcpp_is_integral<signed char> { enum { value = 1 }; }; 60template <> struct __libcpp_is_integral<unsigned char> { enum { value = 1 }; }; 61template <> struct __libcpp_is_integral<wchar_t> { enum { value = 1 }; }; 62#ifndef _LIBCPP_HAS_NO_CHAR8_T 63template <> struct __libcpp_is_integral<char8_t> { enum { value = 1 }; }; 64#endif 65#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 66template <> struct __libcpp_is_integral<char16_t> { enum { value = 1 }; }; 67template <> struct __libcpp_is_integral<char32_t> { enum { value = 1 }; }; 68#endif // _LIBCPP_HAS_NO_UNICODE_CHARS 69template <> struct __libcpp_is_integral<short> { enum { value = 1 }; }; 70template <> struct __libcpp_is_integral<unsigned short> { enum { value = 1 }; }; 71template <> struct __libcpp_is_integral<int> { enum { value = 1 }; }; 72template <> struct __libcpp_is_integral<unsigned int> { enum { value = 1 }; }; 73template <> struct __libcpp_is_integral<long> { enum { value = 1 }; }; 74template <> struct __libcpp_is_integral<unsigned long> { enum { value = 1 }; }; 75template <> struct __libcpp_is_integral<long long> { enum { value = 1 }; }; 76template <> struct __libcpp_is_integral<unsigned long long> { enum { value = 1 }; }; 77#ifndef _LIBCPP_HAS_NO_INT128 78template <> struct __libcpp_is_integral<__int128_t> { enum { value = 1 }; }; 79template <> struct __libcpp_is_integral<__uint128_t> { enum { value = 1 }; }; 80#endif 81 82_LIBCPP_END_NAMESPACE_STD 83 84#if _LIBCPP_STD_VER > 14 85namespace std // purposefully not versioned 86{ 87enum class byte : unsigned char {}; 88 89 90template <bool> struct __enable_if_integral_imp {}; 91template <> struct __enable_if_integral_imp<true> { using type = byte; }; 92template <class _Tp> using _EnableByteOverload = typename __enable_if_integral_imp<__libcpp_is_integral<_Tp>::value>::type; 93 94constexpr byte operator| (byte __lhs, byte __rhs) noexcept 95{ 96 return static_cast<byte>( 97 static_cast<unsigned char>( 98 static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs) 99 )); 100} 101 102constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept 103{ return __lhs = __lhs | __rhs; } 104 105constexpr byte operator& (byte __lhs, byte __rhs) noexcept 106{ 107 return static_cast<byte>( 108 static_cast<unsigned char>( 109 static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs) 110 )); 111} 112 113constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept 114{ return __lhs = __lhs & __rhs; } 115 116constexpr byte operator^ (byte __lhs, byte __rhs) noexcept 117{ 118 return static_cast<byte>( 119 static_cast<unsigned char>( 120 static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs) 121 )); 122} 123 124constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept 125{ return __lhs = __lhs ^ __rhs; } 126 127constexpr byte operator~ (byte __b) noexcept 128{ 129 return static_cast<byte>( 130 static_cast<unsigned char>( 131 ~static_cast<unsigned int>(__b) 132 )); 133} 134template <class _Integer> 135 constexpr _EnableByteOverload<_Integer> & 136 operator<<=(byte& __lhs, _Integer __shift) noexcept 137 { return __lhs = __lhs << __shift; } 138 139template <class _Integer> 140 constexpr _EnableByteOverload<_Integer> 141 operator<< (byte __lhs, _Integer __shift) noexcept 142 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); } 143 144template <class _Integer> 145 constexpr _EnableByteOverload<_Integer> & 146 operator>>=(byte& __lhs, _Integer __shift) noexcept 147 { return __lhs = __lhs >> __shift; } 148 149template <class _Integer> 150 constexpr _EnableByteOverload<_Integer> 151 operator>> (byte __lhs, _Integer __shift) noexcept 152 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); } 153 154template <class _Integer, class = _EnableByteOverload<_Integer> > 155 _LIBCPP_NODISCARD_EXT constexpr _Integer 156 to_integer(byte __b) noexcept { return static_cast<_Integer>(__b); } 157} 158 159#endif 160 161#endif // _LIBCPP_CSTDDEF 162