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Editing: cstddef

// -*- C++ -*- forwarding header.

// Copyright (C) 1997-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file cstddef
 *  This is a Standard C++ Library file.  You should @c \#include this file
 *  in your programs, rather than any of the @a *.h implementation files.
 *
 *  This is the C++ version of the Standard C Library header @c stddef.h,
 *  and its contents are (mostly) the same as that header, but are all
 *  contained in the namespace @c std (except for names which are defined
 *  as macros in C).
 */

//
// ISO C++ 14882: 18.1  Types
//

#ifndef _GLIBCXX_CSTDDEF
#define _GLIBCXX_CSTDDEF 1

#pragma GCC system_header

#undef __need_wchar_t
#undef __need_ptrdiff_t
#undef __need_size_t
#undef __need_NULL
#undef __need_wint_t
#include <bits/c++config.h>
#include <stddef.h>

#if __cplusplus >= 201103L
namespace std
{
  // We handle size_t, ptrdiff_t, and nullptr_t in c++config.h.
  using ::max_align_t;
}
#endif

#if __cplusplus >= 201703L
namespace std
{
#define __cpp_lib_byte 201603

/// std::byte
  enum class byte : unsigned char {};

template<typename _IntegerType> struct __byte_operand { };
  template<> struct __byte_operand<bool> { using __type = byte; };
  template<> struct __byte_operand<char> { using __type = byte; };
  template<> struct __byte_operand<signed char> { using __type = byte; };
  template<> struct __byte_operand<unsigned char> { using __type = byte; };
#ifdef _GLIBCXX_USE_WCHAR_T
  template<> struct __byte_operand<wchar_t> { using __type = byte; };
#endif
  template<> struct __byte_operand<char16_t> { using __type = byte; };
  template<> struct __byte_operand<char32_t> { using __type = byte; };
  template<> struct __byte_operand<short> { using __type = byte; };
  template<> struct __byte_operand<unsigned short> { using __type = byte; };
  template<> struct __byte_operand<int> { using __type = byte; };
  template<> struct __byte_operand<unsigned int> { using __type = byte; };
  template<> struct __byte_operand<long> { using __type = byte; };
  template<> struct __byte_operand<unsigned long> { using __type = byte; };
  template<> struct __byte_operand<long long> { using __type = byte; };
  template<> struct __byte_operand<unsigned long long> { using __type = byte; };
#if defined(__GLIBCXX_TYPE_INT_N_0)
  template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_0>
  { using __type = byte; };
  template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_0>
  { using __type = byte; };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_1)
  template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_1>
  { using __type = byte; };
  template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_1>
  { using __type = byte; };
#endif
#if defined(__GLIBCXX_TYPE_INT_N_2)
  template<> struct __byte_operand<__GLIBCXX_TYPE_INT_N_2>
  { using __type = byte; };
  template<> struct __byte_operand<unsigned __GLIBCXX_TYPE_INT_N_2>
  { using __type = byte; };
#endif
  template<typename _IntegerType>
    struct __byte_operand<const _IntegerType>
    : __byte_operand<_IntegerType> { };
  template<typename _IntegerType>
    struct __byte_operand<volatile _IntegerType>
    : __byte_operand<_IntegerType> { };
  template<typename _IntegerType>
    struct __byte_operand<const volatile _IntegerType>
    : __byte_operand<_IntegerType> { };

template<typename _IntegerType>
    using __byte_op_t = typename __byte_operand<_IntegerType>::__type;

template<typename _IntegerType>
    constexpr __byte_op_t<_IntegerType>&
    operator<<=(byte& __b, _IntegerType __shift) noexcept
    { return __b = byte(static_cast<unsigned char>(__b) << __shift); }

template<typename _IntegerType>
    constexpr __byte_op_t<_IntegerType>
    operator<<(byte __b, _IntegerType __shift) noexcept
    { return byte(static_cast<unsigned char>(__b) << __shift); }

template<typename _IntegerType>
    constexpr __byte_op_t<_IntegerType>&
    operator>>=(byte& __b, _IntegerType __shift) noexcept
    { return __b = byte(static_cast<unsigned char>(__b) >> __shift); }

template<typename _IntegerType>
    constexpr __byte_op_t<_IntegerType>
    operator>>(byte __b, _IntegerType __shift) noexcept
    { return byte(static_cast<unsigned char>(__b) >> __shift); }

constexpr byte&
  operator|=(byte& __l, byte __r) noexcept
  {
    return __l =
      byte(static_cast<unsigned char>(__l) | static_cast<unsigned char>(__r));
  }

constexpr byte
  operator|(byte __l, byte __r) noexcept
  {
    return
      byte(static_cast<unsigned char>(__l) | static_cast<unsigned char>(__r));
  }

constexpr byte&
  operator&=(byte& __l, byte __r) noexcept
  {
   return __l =
     byte(static_cast<unsigned char>(__l) & static_cast<unsigned char>(__r));
  }

constexpr byte
  operator&(byte __l, byte __r) noexcept
  {
    return
      byte(static_cast<unsigned char>(__l) & static_cast<unsigned char>(__r));
  }

constexpr byte&
  operator^=(byte& __l, byte __r) noexcept
  {
    return __l =
      byte(static_cast<unsigned char>(__l) ^ static_cast<unsigned char>(__r));
  }

constexpr byte
  operator^(byte __l, byte __r) noexcept
  {
    return
      byte(static_cast<unsigned char>(__l) ^ static_cast<unsigned char>(__r));
  }

constexpr byte
  operator~(byte __b) noexcept
  { return byte(~static_cast<unsigned char>(__b)); }

template<typename _IntegerType>
    constexpr _IntegerType
    to_integer(__byte_op_t<_IntegerType> __b) noexcept
    { return _IntegerType(__b); }

} // namespace std
#endif

#endif // _GLIBCXX_CSTDDEF

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