1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 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 }; }; 61#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS 62template <> struct __libcpp_is_integral<wchar_t> { enum { value = 1 }; }; 63#endif 64#ifndef _LIBCPP_HAS_NO_CHAR8_T 65template <> struct __libcpp_is_integral<char8_t> { enum { value = 1 }; }; 66#endif 67#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 68template <> struct __libcpp_is_integral<char16_t> { enum { value = 1 }; }; 69template <> struct __libcpp_is_integral<char32_t> { enum { value = 1 }; }; 70#endif 71template <> struct __libcpp_is_integral<short> { enum { value = 1 }; }; 72template <> struct __libcpp_is_integral<unsigned short> { enum { value = 1 }; }; 73template <> struct __libcpp_is_integral<int> { enum { value = 1 }; }; 74template <> struct __libcpp_is_integral<unsigned int> { enum { value = 1 }; }; 75template <> struct __libcpp_is_integral<long> { enum { value = 1 }; }; 76template <> struct __libcpp_is_integral<unsigned long> { enum { value = 1 }; }; 77template <> struct __libcpp_is_integral<long long> { enum { value = 1 }; }; 78template <> struct __libcpp_is_integral<unsigned long long> { enum { value = 1 }; }; 79#ifndef _LIBCPP_HAS_NO_INT128 80template <> struct __libcpp_is_integral<__int128_t> { enum { value = 1 }; }; 81template <> struct __libcpp_is_integral<__uint128_t> { enum { value = 1 }; }; 82#endif 83 84_LIBCPP_END_NAMESPACE_STD 85 86#if _LIBCPP_STD_VER > 14 87namespace std // purposefully not versioned 88{ 89enum class byte : unsigned char {}; 90 91 92template <bool> struct __enable_if_integral_imp {}; 93template <> struct __enable_if_integral_imp<true> { using type = byte; }; 94template <class _Tp> using _EnableByteOverload = typename __enable_if_integral_imp<__libcpp_is_integral<_Tp>::value>::type; 95 96constexpr byte operator| (byte __lhs, byte __rhs) noexcept 97{ 98 return static_cast<byte>( 99 static_cast<unsigned char>( 100 static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs) 101 )); 102} 103 104constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept 105{ return __lhs = __lhs | __rhs; } 106 107constexpr byte operator& (byte __lhs, byte __rhs) noexcept 108{ 109 return static_cast<byte>( 110 static_cast<unsigned char>( 111 static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs) 112 )); 113} 114 115constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept 116{ return __lhs = __lhs & __rhs; } 117 118constexpr byte operator^ (byte __lhs, byte __rhs) noexcept 119{ 120 return static_cast<byte>( 121 static_cast<unsigned char>( 122 static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs) 123 )); 124} 125 126constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept 127{ return __lhs = __lhs ^ __rhs; } 128 129constexpr byte operator~ (byte __b) noexcept 130{ 131 return static_cast<byte>( 132 static_cast<unsigned char>( 133 ~static_cast<unsigned int>(__b) 134 )); 135} 136template <class _Integer> 137 constexpr _EnableByteOverload<_Integer> & 138 operator<<=(byte& __lhs, _Integer __shift) noexcept 139 { return __lhs = __lhs << __shift; } 140 141template <class _Integer> 142 constexpr _EnableByteOverload<_Integer> 143 operator<< (byte __lhs, _Integer __shift) noexcept 144 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); } 145 146template <class _Integer> 147 constexpr _EnableByteOverload<_Integer> & 148 operator>>=(byte& __lhs, _Integer __shift) noexcept 149 { return __lhs = __lhs >> __shift; } 150 151template <class _Integer> 152 constexpr _EnableByteOverload<_Integer> 153 operator>> (byte __lhs, _Integer __shift) noexcept 154 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); } 155 156template <class _Integer, class = _EnableByteOverload<_Integer> > 157 _LIBCPP_NODISCARD_EXT constexpr _Integer 158 to_integer(byte __b) noexcept { return static_cast<_Integer>(__b); } 159 160} // namespace std 161 162#endif 163 164#endif // _LIBCPP_CSTDDEF 165