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 #include <version> 39 40 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 41 #pragma GCC system_header 42 #endif 43 44 // Don't include our own <stddef.h>; we don't want to declare ::nullptr_t. 45 #include_next <stddef.h> 46 #include <__nullptr> 47 48 _LIBCPP_BEGIN_NAMESPACE_STD 49 50 using ::ptrdiff_t; 51 using ::size_t; 52 53 #if defined(__CLANG_MAX_ALIGN_T_DEFINED) || defined(_GCC_MAX_ALIGN_T) || \ 54 defined(__DEFINED_max_align_t) || defined(__NetBSD__) 55 // Re-use the compiler's <stddef.h> max_align_t where possible. 56 using ::max_align_t; 57 #else 58 typedef long double max_align_t; 59 #endif 60 61 _LIBCPP_END_NAMESPACE_STD 62 63 #if _LIBCPP_STD_VER > 14 64 namespace std // purposefully not versioned 65 { 66 enum class byte : unsigned char {}; 67 68 constexpr byte operator| (byte __lhs, byte __rhs) noexcept 69 { 70 return static_cast<byte>( 71 static_cast<unsigned char>( 72 static_cast<unsigned int>(__lhs) | static_cast<unsigned int>(__rhs) 73 )); 74 } 75 76 constexpr byte& operator|=(byte& __lhs, byte __rhs) noexcept 77 { return __lhs = __lhs | __rhs; } 78 79 constexpr byte operator& (byte __lhs, byte __rhs) noexcept 80 { 81 return static_cast<byte>( 82 static_cast<unsigned char>( 83 static_cast<unsigned int>(__lhs) & static_cast<unsigned int>(__rhs) 84 )); 85 } 86 87 constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept 88 { return __lhs = __lhs & __rhs; } 89 90 constexpr byte operator^ (byte __lhs, byte __rhs) noexcept 91 { 92 return static_cast<byte>( 93 static_cast<unsigned char>( 94 static_cast<unsigned int>(__lhs) ^ static_cast<unsigned int>(__rhs) 95 )); 96 } 97 98 constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept 99 { return __lhs = __lhs ^ __rhs; } 100 101 constexpr byte operator~ (byte __b) noexcept 102 { 103 return static_cast<byte>( 104 static_cast<unsigned char>( 105 ~static_cast<unsigned int>(__b) 106 )); 107 } 108 109 } 110 111 #include <type_traits> // rest of byte 112 #endif 113 114 #endif // _LIBCPP_CSTDDEF 115
