1 // -*- C++ -*- 2 //===--------------------------- cstddef ----------------------------------===// 3 // 4 // The LLVM Compiler Infrastructure 5 // 6 // This file is dual licensed under the MIT and the University of Illinois Open 7 // Source Licenses. See LICENSE.TXT for details. 8 // 9 //===----------------------------------------------------------------------===// 10 11 #ifndef _LIBCPP_CSTDDEF 12 #define _LIBCPP_CSTDDEF 13 14 /* 15 cstddef synopsis 16 17 Macros: 18 19 offsetof(type,member-designator) 20 NULL 21 22 namespace std 23 { 24 25 Types: 26 27 ptrdiff_t 28 size_t 29 max_align_t 30 nullptr_t 31 byte // C++17 32 33 } // std 34 35 */ 36 37 #include <__config> 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 49 using ::ptrdiff_t; 50 using ::size_t; 51 52 #if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \ 53 defined(__DEFINED_max_align_t) 54 // Re-use the compiler's <stddef.h> max_align_t where possible. 55 using ::max_align_t; 56 #else 57 typedef long double max_align_t; 58 #endif 59 60 _LIBCPP_END_NAMESPACE_STD 61 62 #if _LIBCPP_STD_VER > 14 63 namespace std // purposefully not versioned 64 { 65 enum class byte : unsigned char {}; 66 67 constexpr byte operator| (byte __lhs, byte __rhs) noexcept 68 { 69 return static_cast<byte>( 70 static_cast<unsigned char>( 71 static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs) 72 )); 73 } 74 75 constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept 76 { return __lhs = __lhs | __rhs; } 77 78 constexpr byte operator& (byte __lhs, byte __rhs) noexcept 79 { 80 return static_cast<byte>( 81 static_cast<unsigned char>( 82 static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs) 83 )); 84 } 85 86 constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept 87 { return __lhs = __lhs & __rhs; } 88 89 constexpr byte operator^ (byte __lhs, byte __rhs) noexcept 90 { 91 return static_cast<byte>( 92 static_cast<unsigned char>( 93 static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs) 94 )); 95 } 96 97 constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept 98 { return __lhs = __lhs ^ __rhs; } 99 100 constexpr byte operator~ (byte __b) noexcept 101 { 102 return static_cast<byte>( 103 static_cast<unsigned char>( 104 ~static_cast<unsigned int>(__b) 105 )); 106 } 107 108 } 109 110 #include <type_traits> // rest of byte 111 #endif 112 113 #endif // _LIBCPP_CSTDDEF 114
