<h2>Editing File: /usr/include/c++/8/debug/array</h2><form method='post'><textarea name='content' class='file-edit'>// Debugging array implementation -*- C++ -*-

// Copyright (C) 2012-2018 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 debug/array
 *  This is a Standard C++ Library header.
 */

#ifndef _GLIBCXX_DEBUG_ARRAY
#define _GLIBCXX_DEBUG_ARRAY 1

#pragma GCC system_header

#include &lt;array&gt;

#include &lt;debug/formatter.h&gt;
#include &lt;debug/macros.h&gt;

namespace std _GLIBCXX_VISIBILITY(default)
{
namespace __debug
{
  template&lt;typename _Tp, std::size_t _Nm&gt;
    struct array
    {
      typedef _Tp 	    			      value_type;
      typedef value_type*			      pointer;
      typedef const value_type*                       const_pointer;
      typedef value_type&amp;                   	      reference;
      typedef const value_type&amp;             	      const_reference;
      typedef value_type*                             iterator;
      typedef const value_type*                       const_iterator;
      typedef std::size_t                    	      size_type;
      typedef std::ptrdiff_t                   	      difference_type;
      typedef std::reverse_iterator&lt;iterator&gt;	      reverse_iterator;
      typedef std::reverse_iterator&lt;const_iterator&gt;   const_reverse_iterator;

      // Support for zero-sized arrays mandatory.
      typedef _GLIBCXX_STD_C::__array_traits&lt;_Tp, _Nm&gt; _AT_Type;
      typename _AT_Type::_Type                         _M_elems;

      template&lt;std::size_t _Size&gt;
	struct _Array_check_subscript
 	{
	  std::size_t size() { return _Size; }

	  _Array_check_subscript(std::size_t __index)
	  { __glibcxx_check_subscript(__index); }
        };

      template&lt;std::size_t _Size&gt;
	struct _Array_check_nonempty
 	{
	  bool empty() { return _Size == 0; }

	  _Array_check_nonempty()
	  { __glibcxx_check_nonempty(); }
        };

      // No explicit construct/copy/destroy for aggregate type.

      // DR 776.
      void
      fill(const value_type&amp; __u)
      { std::fill_n(begin(), size(), __u); }

      void
      swap(array&amp; __other)
      noexcept(_AT_Type::_Is_nothrow_swappable::value)
      { std::swap_ranges(begin(), end(), __other.begin()); }

      // Iterators.
      _GLIBCXX17_CONSTEXPR iterator
      begin() noexcept
      { return iterator(data()); }

      _GLIBCXX17_CONSTEXPR const_iterator
      begin() const noexcept
      { return const_iterator(data()); }

      _GLIBCXX17_CONSTEXPR iterator
      end() noexcept
      { return iterator(data() + _Nm); }

      _GLIBCXX17_CONSTEXPR const_iterator
      end() const noexcept
      { return const_iterator(data() + _Nm); }

      _GLIBCXX17_CONSTEXPR reverse_iterator
      rbegin() noexcept
      { return reverse_iterator(end()); }

      _GLIBCXX17_CONSTEXPR const_reverse_iterator
      rbegin() const noexcept
      { return const_reverse_iterator(end()); }

      _GLIBCXX17_CONSTEXPR reverse_iterator
      rend() noexcept
      { return reverse_iterator(begin()); }

      _GLIBCXX17_CONSTEXPR const_reverse_iterator
      rend() const noexcept
      { return const_reverse_iterator(begin()); }

      _GLIBCXX17_CONSTEXPR const_iterator
      cbegin() const noexcept
      { return const_iterator(data()); }

      _GLIBCXX17_CONSTEXPR const_iterator
      cend() const noexcept
      { return const_iterator(data() + _Nm); }

      _GLIBCXX17_CONSTEXPR const_reverse_iterator
      crbegin() const noexcept
      { return const_reverse_iterator(end()); }

      _GLIBCXX17_CONSTEXPR const_reverse_iterator
      crend() const noexcept
      { return const_reverse_iterator(begin()); }

      // Capacity.
      constexpr size_type
      size() const noexcept { return _Nm; }

      constexpr size_type
      max_size() const noexcept { return _Nm; }

      constexpr bool
      empty() const noexcept { return size() == 0; }

      // Element access.
      _GLIBCXX17_CONSTEXPR reference
      operator[](size_type __n) noexcept
      {
	__glibcxx_check_subscript(__n);
	return _AT_Type::_S_ref(_M_elems, __n);
      }

      constexpr const_reference
      operator[](size_type __n) const noexcept
      {
	return __n &lt; _Nm ? _AT_Type::_S_ref(_M_elems, __n)
	 : (_GLIBCXX_THROW_OR_ABORT(_Array_check_subscript&lt;_Nm&gt;(__n)),
	    _AT_Type::_S_ref(_M_elems, 0));
      }

      _GLIBCXX17_CONSTEXPR reference
      at(size_type __n)
      {
	if (__n &gt;= _Nm)
	  std::__throw_out_of_range_fmt(__N(&quot;array::at: __n (which is %zu) &quot;
					    &quot;&gt;= _Nm (which is %zu)&quot;),
					__n, _Nm);
	return _AT_Type::_S_ref(_M_elems, __n);
      }

      constexpr const_reference
      at(size_type __n) const
      {
	// Result of conditional expression must be an lvalue so use
	// boolean ? lvalue : (throw-expr, lvalue)
	return __n &lt; _Nm ? _AT_Type::_S_ref(_M_elems, __n)
	  : (std::__throw_out_of_range_fmt(__N(&quot;array::at: __n (which is %zu) &quot;
					       &quot;&gt;= _Nm (which is %zu)&quot;),
					   __n, _Nm),
	     _AT_Type::_S_ref(_M_elems, 0));
      }

      _GLIBCXX17_CONSTEXPR reference
      front() noexcept
      {
	__glibcxx_check_nonempty();
	return *begin();
      }

      constexpr const_reference
      front() const noexcept
      {
	return _Nm ? _AT_Type::_S_ref(_M_elems, 0)
	  : (_GLIBCXX_THROW_OR_ABORT(_Array_check_nonempty&lt;_Nm&gt;()),
	     _AT_Type::_S_ref(_M_elems, 0));
      }

      _GLIBCXX17_CONSTEXPR reference
      back() noexcept
      {
	__glibcxx_check_nonempty();
	return _Nm ? *(end() - 1) : *end();
      }

      constexpr const_reference
      back() const noexcept
      {
	return _Nm ? _AT_Type::_S_ref(_M_elems, _Nm - 1)
	  : (_GLIBCXX_THROW_OR_ABORT(_Array_check_nonempty&lt;_Nm&gt;()),
	     _AT_Type::_S_ref(_M_elems, 0));
      }

      _GLIBCXX17_CONSTEXPR pointer
      data() noexcept
      { return _AT_Type::_S_ptr(_M_elems); }

      _GLIBCXX17_CONSTEXPR const_pointer
      data() const noexcept
      { return _AT_Type::_S_ptr(_M_elems); }
    };

#if __cpp_deduction_guides &gt;= 201606
  template&lt;typename _Tp, typename... _Up&gt;
    array(_Tp, _Up...)
      -&gt; array&lt;std::enable_if_t&lt;(std::is_same_v&lt;_Tp, _Up&gt; &amp;&amp; ...), _Tp&gt;,
	       1 + sizeof...(_Up)&gt;;
#endif

  // Array comparisons.
  template&lt;typename _Tp, std::size_t _Nm&gt;
    inline bool
    operator==(const array&lt;_Tp, _Nm&gt;&amp; __one, const array&lt;_Tp, _Nm&gt;&amp; __two)
    { return std::equal(__one.begin(), __one.end(), __two.begin()); }

  template&lt;typename _Tp, std::size_t _Nm&gt;
    inline bool
    operator!=(const array&lt;_Tp, _Nm&gt;&amp; __one, const array&lt;_Tp, _Nm&gt;&amp; __two)
    { return !(__one == __two); }

  template&lt;typename _Tp, std::size_t _Nm&gt;
    inline bool
    operator&lt;(const array&lt;_Tp, _Nm&gt;&amp; __a, const array&lt;_Tp, _Nm&gt;&amp; __b)
    {
      return std::lexicographical_compare(__a.begin(), __a.end(),
					  __b.begin(), __b.end());
    }

  template&lt;typename _Tp, std::size_t _Nm&gt;
    inline bool
    operator&gt;(const array&lt;_Tp, _Nm&gt;&amp; __one, const array&lt;_Tp, _Nm&gt;&amp; __two)
    { return __two &lt; __one; }

  template&lt;typename _Tp, std::size_t _Nm&gt;
    inline bool
    operator&lt;=(const array&lt;_Tp, _Nm&gt;&amp; __one, const array&lt;_Tp, _Nm&gt;&amp; __two)
    { return !(__one &gt; __two); }

  template&lt;typename _Tp, std::size_t _Nm&gt;
    inline bool
    operator&gt;=(const array&lt;_Tp, _Nm&gt;&amp; __one, const array&lt;_Tp, _Nm&gt;&amp; __two)
    { return !(__one &lt; __two); }

  // Specialized algorithms.

#if __cplusplus &gt; 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
  template&lt;typename _Tp, size_t _Nm&gt;
    typename enable_if&lt;
      !_GLIBCXX_STD_C::__array_traits&lt;_Tp, _Nm&gt;::_Is_swappable::value&gt;::type
    swap(array&lt;_Tp, _Nm&gt;&amp;, array&lt;_Tp, _Nm&gt;&amp;) = delete;
#endif

  template&lt;typename _Tp, std::size_t _Nm&gt;
    inline void
    swap(array&lt;_Tp, _Nm&gt;&amp; __one, array&lt;_Tp, _Nm&gt;&amp; __two)
    noexcept(noexcept(__one.swap(__two)))
    { __one.swap(__two); }

  template&lt;std::size_t _Int, typename _Tp, std::size_t _Nm&gt;
    constexpr _Tp&amp;
    get(array&lt;_Tp, _Nm&gt;&amp; __arr) noexcept
    {
      static_assert(_Int &lt; _Nm, &quot;index is out of bounds&quot;);
      return _GLIBCXX_STD_C::__array_traits&lt;_Tp, _Nm&gt;::
	_S_ref(__arr._M_elems, _Int);
    }

  template&lt;std::size_t _Int, typename _Tp, std::size_t _Nm&gt;
    constexpr _Tp&amp;&amp;
    get(array&lt;_Tp, _Nm&gt;&amp;&amp; __arr) noexcept
    {
      static_assert(_Int &lt; _Nm, &quot;index is out of bounds&quot;);
      return std::move(__debug::get&lt;_Int&gt;(__arr));
    }

  template&lt;std::size_t _Int, typename _Tp, std::size_t _Nm&gt;
    constexpr const _Tp&amp;
    get(const array&lt;_Tp, _Nm&gt;&amp; __arr) noexcept
    {
      static_assert(_Int &lt; _Nm, &quot;index is out of bounds&quot;);
      return _GLIBCXX_STD_C::__array_traits&lt;_Tp, _Nm&gt;::
	_S_ref(__arr._M_elems, _Int);
    }

  template&lt;std::size_t _Int, typename _Tp, std::size_t _Nm&gt;
    constexpr const _Tp&amp;&amp;
    get(const array&lt;_Tp, _Nm&gt;&amp;&amp; __arr) noexcept
    {
      static_assert(_Int &lt; _Nm, &quot;index is out of bounds&quot;);
      return std::move(__debug::get&lt;_Int&gt;(__arr));
    }
} // namespace __debug

_GLIBCXX_BEGIN_NAMESPACE_VERSION
  // Tuple interface to class template array.

  /// tuple_size
  template&lt;typename _Tp, std::size_t _Nm&gt;
    struct tuple_size&lt;std::__debug::array&lt;_Tp, _Nm&gt;&gt;
    : public integral_constant&lt;std::size_t, _Nm&gt; { };

  /// tuple_element
  template&lt;std::size_t _Int, typename _Tp, std::size_t _Nm&gt;
    struct tuple_element&lt;_Int, std::__debug::array&lt;_Tp, _Nm&gt;&gt;
    {
      static_assert(_Int &lt; _Nm, &quot;index is out of bounds&quot;);
      typedef _Tp type;
    };

  template&lt;typename _Tp, std::size_t _Nm&gt;
    struct __is_tuple_like_impl&lt;std::__debug::array&lt;_Tp, _Nm&gt;&gt; : true_type
    { };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std

#endif // _GLIBCXX_DEBUG_ARRAY
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