<h2>Editing File: /usr/include/c++/8/cstddef</h2><form method='post'><textarea name='content' class='file-edit'>// -*- 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
// &lt;http://www.gnu.org/licenses/&gt;.

/** @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 &lt;bits/c++config.h&gt;
#include &lt;stddef.h&gt;

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

#if __cplusplus &gt;= 201703L
namespace std
{
#define __cpp_lib_byte 201603

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

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

  template&lt;typename _IntegerType&gt;
    using __byte_op_t = typename __byte_operand&lt;_IntegerType&gt;::__type;

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

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

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

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

  constexpr byte&amp;
  operator|=(byte&amp; __l, byte __r) noexcept
  {
    return __l =
      byte(static_cast&lt;unsigned char&gt;(__l) | static_cast&lt;unsigned char&gt;(__r));
  }

  constexpr byte
  operator|(byte __l, byte __r) noexcept
  {
    return
      byte(static_cast&lt;unsigned char&gt;(__l) | static_cast&lt;unsigned char&gt;(__r));
  }

  constexpr byte&amp;
  operator&amp;=(byte&amp; __l, byte __r) noexcept
  {
   return __l =
     byte(static_cast&lt;unsigned char&gt;(__l) &amp; static_cast&lt;unsigned char&gt;(__r));
  }

  constexpr byte
  operator&amp;(byte __l, byte __r) noexcept
  {
    return
      byte(static_cast&lt;unsigned char&gt;(__l) &amp; static_cast&lt;unsigned char&gt;(__r));
  }

  constexpr byte&amp;
  operator^=(byte&amp; __l, byte __r) noexcept
  {
    return __l =
      byte(static_cast&lt;unsigned char&gt;(__l) ^ static_cast&lt;unsigned char&gt;(__r));
  }

  constexpr byte
  operator^(byte __l, byte __r) noexcept
  {
    return
      byte(static_cast&lt;unsigned char&gt;(__l) ^ static_cast&lt;unsigned char&gt;(__r));
  }

  constexpr byte
  operator~(byte __b) noexcept
  { return byte(~static_cast&lt;unsigned char&gt;(__b)); }

  template&lt;typename _IntegerType&gt;
    constexpr _IntegerType
    to_integer(__byte_op_t&lt;_IntegerType&gt; __b) noexcept
    { return _IntegerType(__b); }

} // namespace std
#endif

#endif // _GLIBCXX_CSTDDEF
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