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      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 { return __lhs = byte(static_cast<unsigned char>(__lhs) | static_cast<unsigned char>(__rhs)); }
     69 constexpr byte  operator| (byte  __lhs, byte __rhs) noexcept
     70 { return         byte(static_cast<unsigned char>(__lhs) | static_cast<unsigned char>(__rhs)); }
     71 
     72 constexpr byte& operator&=(byte& __lhs, byte __rhs) noexcept
     73 { return __lhs = byte(static_cast<unsigned char>(__lhs) & static_cast<unsigned char>(__rhs)); }
     74 constexpr byte  operator& (byte  __lhs, byte __rhs) noexcept
     75 { return         byte(static_cast<unsigned char>(__lhs) & static_cast<unsigned char>(__rhs)); }
     76 
     77 constexpr byte& operator^=(byte& __lhs, byte __rhs) noexcept 
     78 { return __lhs = byte(static_cast<unsigned char>(__lhs) ^ static_cast<unsigned char>(__rhs)); }
     79 constexpr byte  operator^ (byte  __lhs, byte __rhs) noexcept
     80 { return         byte(static_cast<unsigned char>(__lhs) ^ static_cast<unsigned char>(__rhs)); }
     81 
     82 constexpr byte  operator~ (byte __b) noexcept
     83 { return  byte(~static_cast<unsigned char>(__b)); }
     84 
     85 }
     86 
     87 #include <type_traits>  // rest of byte
     88 #endif
     89 
     90 #endif  // _LIBCPP_CSTDDEF
     91