<h2>File Contents: //usr/include/c++/8/debug/deque</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='//usr/include/c++/8/debug/deque'><textarea name='file_content' rows='10' cols='50'>// Debugging deque implementation -*- C++ -*-

// Copyright (C) 2003-2018 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/deque
 *  This file is a GNU debug extension to the Standard C++ Library.
 */

#ifndef _GLIBCXX_DEBUG_DEQUE
#define _GLIBCXX_DEBUG_DEQUE 1

#pragma GCC system_header

#include &lt;deque&gt;
#include &lt;debug/safe_sequence.h&gt;
#include &lt;debug/safe_container.h&gt;
#include &lt;debug/safe_iterator.h&gt;

namespace std _GLIBCXX_VISIBILITY(default)
{
namespace __debug
{
  /// Class std::deque with safety/checking/debug instrumentation.
  template&lt;typename _Tp, typename _Allocator = std::allocator&lt;_Tp&gt; &gt;
    class deque
    : public __gnu_debug::_Safe_container&lt;
	deque&lt;_Tp, _Allocator&gt;, _Allocator,
	__gnu_debug::_Safe_sequence&gt;,
      public _GLIBCXX_STD_C::deque&lt;_Tp, _Allocator&gt;
    {
      typedef  _GLIBCXX_STD_C::deque&lt;_Tp, _Allocator&gt;		_Base;
      typedef __gnu_debug::_Safe_container&lt;
	deque, _Allocator, __gnu_debug::_Safe_sequence&gt;	_Safe;

      typedef typename _Base::const_iterator	_Base_const_iterator;
      typedef typename _Base::iterator		_Base_iterator;
      typedef __gnu_debug::_Equal_to&lt;_Base_const_iterator&gt; _Equal;

    public:
      typedef typename _Base::reference			reference;
      typedef typename _Base::const_reference		const_reference;

      typedef __gnu_debug::_Safe_iterator&lt;_Base_iterator, deque&gt;
							iterator;
      typedef __gnu_debug::_Safe_iterator&lt;_Base_const_iterator, deque&gt;
							const_iterator;

      typedef typename _Base::size_type			size_type;
      typedef typename _Base::difference_type		difference_type;

      typedef _Tp					value_type;
      typedef _Allocator				allocator_type;
      typedef typename _Base::pointer			pointer;
      typedef typename _Base::const_pointer		const_pointer;
      typedef std::reverse_iterator&lt;iterator&gt;		reverse_iterator;
      typedef std::reverse_iterator&lt;const_iterator&gt;	const_reverse_iterator;

      // 23.2.1.1 construct/copy/destroy:

#if __cplusplus &lt; 201103L
      deque()
      : _Base() { }

      deque(const deque&amp; __x)
      : _Base(__x) { }

      ~deque() { }
#else
      deque() = default;
      deque(const deque&amp;) = default;
      deque(deque&amp;&amp;) = default;

      deque(const deque&amp; __d, const _Allocator&amp; __a)
      : _Base(__d, __a) { }

      deque(deque&amp;&amp; __d, const _Allocator&amp; __a)
      : _Safe(std::move(__d)), _Base(std::move(__d), __a) { }

      deque(initializer_list&lt;value_type&gt; __l,
	    const allocator_type&amp; __a = allocator_type())
      : _Base(__l, __a) { }

      ~deque() = default;
#endif

      explicit
      deque(const _Allocator&amp; __a)
      : _Base(__a) { }

#if __cplusplus &gt;= 201103L
      explicit
      deque(size_type __n, const _Allocator&amp; __a = _Allocator())
      : _Base(__n, __a) { }

      deque(size_type __n, const _Tp&amp; __value,
	    const _Allocator&amp; __a = _Allocator())
      : _Base(__n, __value, __a) { }
#else
      explicit
      deque(size_type __n, const _Tp&amp; __value = _Tp(),
	    const _Allocator&amp; __a = _Allocator())
      : _Base(__n, __value, __a) { }
#endif

#if __cplusplus &gt;= 201103L
      template&lt;class _InputIterator,
	       typename = std::_RequireInputIter&lt;_InputIterator&gt;&gt;
#else
      template&lt;class _InputIterator&gt;
#endif
	deque(_InputIterator __first, _InputIterator __last,
	      const _Allocator&amp; __a = _Allocator())
	: _Base(__gnu_debug::__base(__gnu_debug::__check_valid_range(__first,
								     __last)),
		__gnu_debug::__base(__last), __a)
	{ }

      deque(const _Base&amp; __x)
      : _Base(__x) { }

#if __cplusplus &lt; 201103L
      deque&amp;
      operator=(const deque&amp; __x)
      {
	this-&gt;_M_safe() = __x;
	_M_base() = __x;
	return *this;
      }
#else
      deque&amp;
      operator=(const deque&amp;) = default;

      deque&amp;
      operator=(deque&amp;&amp;) = default;

      deque&amp;
      operator=(initializer_list&lt;value_type&gt; __l)
      {
	_M_base() = __l;
	this-&gt;_M_invalidate_all();
	return *this;
      }
#endif

#if __cplusplus &gt;= 201103L
      template&lt;class _InputIterator,
	       typename = std::_RequireInputIter&lt;_InputIterator&gt;&gt;
#else
      template&lt;class _InputIterator&gt;
#endif
	void
	assign(_InputIterator __first, _InputIterator __last)
	{
	  typename __gnu_debug::_Distance_traits&lt;_InputIterator&gt;::__type __dist;
	  __glibcxx_check_valid_range2(__first, __last, __dist);
	  if (__dist.second &gt;= __gnu_debug::__dp_sign)
	    _Base::assign(__gnu_debug::__unsafe(__first),
			  __gnu_debug::__unsafe(__last));
	  else
	    _Base::assign(__first, __last);

	  this-&gt;_M_invalidate_all();
	}

      void
      assign(size_type __n, const _Tp&amp; __t)
      {
	_Base::assign(__n, __t);
	this-&gt;_M_invalidate_all();
      }

#if __cplusplus &gt;= 201103L
      void
      assign(initializer_list&lt;value_type&gt; __l)
      {
	_Base::assign(__l);
	this-&gt;_M_invalidate_all();
      }
#endif

      using _Base::get_allocator;

      // iterators:
      iterator
      begin() _GLIBCXX_NOEXCEPT
      { return iterator(_Base::begin(), this); }

      const_iterator
      begin() const _GLIBCXX_NOEXCEPT
      { return const_iterator(_Base::begin(), this); }

      iterator
      end() _GLIBCXX_NOEXCEPT
      { return iterator(_Base::end(), this); }

      const_iterator
      end() const _GLIBCXX_NOEXCEPT
      { return const_iterator(_Base::end(), this); }

      reverse_iterator
      rbegin() _GLIBCXX_NOEXCEPT
      { return reverse_iterator(end()); }

      const_reverse_iterator
      rbegin() const _GLIBCXX_NOEXCEPT
      { return const_reverse_iterator(end()); }

      reverse_iterator
      rend() _GLIBCXX_NOEXCEPT
      { return reverse_iterator(begin()); }

      const_reverse_iterator
      rend() const _GLIBCXX_NOEXCEPT
      { return const_reverse_iterator(begin()); }

#if __cplusplus &gt;= 201103L
      const_iterator
      cbegin() const noexcept
      { return const_iterator(_Base::begin(), this); }

      const_iterator
      cend() const noexcept
      { return const_iterator(_Base::end(), this); }

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

      const_reverse_iterator
      crend() const noexcept
      { return const_reverse_iterator(begin()); }
#endif

    private:
      void
      _M_invalidate_after_nth(difference_type __n)
      {
	typedef __gnu_debug::_After_nth_from&lt;_Base_const_iterator&gt; _After_nth;
	this-&gt;_M_invalidate_if(_After_nth(__n, _Base::begin()));
      }

    public:
      // 23.2.1.2 capacity:
      using _Base::size;
      using _Base::max_size;

#if __cplusplus &gt;= 201103L
      void
      resize(size_type __sz)
      {
	bool __invalidate_all = __sz &gt; this-&gt;size();
	if (__sz &lt; this-&gt;size())
	  this-&gt;_M_invalidate_after_nth(__sz);

	_Base::resize(__sz);

	if (__invalidate_all)
	  this-&gt;_M_invalidate_all();
      }

      void
      resize(size_type __sz, const _Tp&amp; __c)
      {
	bool __invalidate_all = __sz &gt; this-&gt;size();
	if (__sz &lt; this-&gt;size())
	  this-&gt;_M_invalidate_after_nth(__sz);

	_Base::resize(__sz, __c);

	if (__invalidate_all)
	  this-&gt;_M_invalidate_all();
      }
#else
      void
      resize(size_type __sz, _Tp __c = _Tp())
      {
	bool __invalidate_all = __sz &gt; this-&gt;size();
	if (__sz &lt; this-&gt;size())
	  this-&gt;_M_invalidate_after_nth(__sz);

	_Base::resize(__sz, __c);

	if (__invalidate_all)
	  this-&gt;_M_invalidate_all();
      }
#endif

#if __cplusplus &gt;= 201103L
      void
      shrink_to_fit() noexcept
      {
	if (_Base::_M_shrink_to_fit())
	  this-&gt;_M_invalidate_all();
      }
#endif

      using _Base::empty;

      // element access:
      reference
      operator[](size_type __n) _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_subscript(__n);
	return _M_base()[__n];
      }

      const_reference
      operator[](size_type __n) const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_subscript(__n);
	return _M_base()[__n];
      }

      using _Base::at;

      reference
      front() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::front();
      }

      const_reference
      front() const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::front();
      }

      reference
      back() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::back();
      }

      const_reference
      back() const _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	return _Base::back();
      }

      // 23.2.1.3 modifiers:
      void
      push_front(const _Tp&amp; __x)
      {
	_Base::push_front(__x);
	this-&gt;_M_invalidate_all();
      }

      void
      push_back(const _Tp&amp; __x)
      {
	_Base::push_back(__x);
	this-&gt;_M_invalidate_all();
      }

#if __cplusplus &gt;= 201103L
      void
      push_front(_Tp&amp;&amp; __x)
      { emplace_front(std::move(__x)); }

      void
      push_back(_Tp&amp;&amp; __x)
      { emplace_back(std::move(__x)); }

      template&lt;typename... _Args&gt;
#if __cplusplus &gt; 201402L
	reference
#else
	void
#endif
	emplace_front(_Args&amp;&amp;... __args)
	{
	  _Base::emplace_front(std::forward&lt;_Args&gt;(__args)...);
	  this-&gt;_M_invalidate_all();
#if __cplusplus &gt; 201402L
	  return front();
#endif
	}

      template&lt;typename... _Args&gt;
#if __cplusplus &gt; 201402L
	reference
#else
	void
#endif
	emplace_back(_Args&amp;&amp;... __args)
	{
	  _Base::emplace_back(std::forward&lt;_Args&gt;(__args)...);
	  this-&gt;_M_invalidate_all();
#if __cplusplus &gt; 201402L
	  return back();
#endif
	}

      template&lt;typename... _Args&gt;
	iterator
	emplace(const_iterator __position, _Args&amp;&amp;... __args)
	{
	  __glibcxx_check_insert(__position);
	  _Base_iterator __res = _Base::emplace(__position.base(),
						std::forward&lt;_Args&gt;(__args)...);
	  this-&gt;_M_invalidate_all();
	  return iterator(__res, this);
	}
#endif

      iterator
#if __cplusplus &gt;= 201103L
      insert(const_iterator __position, const _Tp&amp; __x)
#else
      insert(iterator __position, const _Tp&amp; __x)
#endif
      {
	__glibcxx_check_insert(__position);
	_Base_iterator __res = _Base::insert(__position.base(), __x);
	this-&gt;_M_invalidate_all();
	return iterator(__res, this);
      }

#if __cplusplus &gt;= 201103L
      iterator
      insert(const_iterator __position, _Tp&amp;&amp; __x)
      { return emplace(__position, std::move(__x)); }

      iterator
      insert(const_iterator __position, initializer_list&lt;value_type&gt; __l)
      {
	__glibcxx_check_insert(__position);
	_Base_iterator __res = _Base::insert(__position.base(), __l);
	this-&gt;_M_invalidate_all();
	return iterator(__res, this);
      }
#endif

#if __cplusplus &gt;= 201103L
      iterator
      insert(const_iterator __position, size_type __n, const _Tp&amp; __x)
      {
	__glibcxx_check_insert(__position);
	_Base_iterator __res = _Base::insert(__position.base(), __n, __x);
	this-&gt;_M_invalidate_all();
	return iterator(__res, this);
      }
#else
      void
      insert(iterator __position, size_type __n, const _Tp&amp; __x)
      {
	__glibcxx_check_insert(__position);
	_Base::insert(__position.base(), __n, __x);
	this-&gt;_M_invalidate_all();
      }
#endif

#if __cplusplus &gt;= 201103L
      template&lt;class _InputIterator,
	       typename = std::_RequireInputIter&lt;_InputIterator&gt;&gt;
	iterator
	insert(const_iterator __position,
	       _InputIterator __first, _InputIterator __last)
	{
	  typename __gnu_debug::_Distance_traits&lt;_InputIterator&gt;::__type __dist;
	  __glibcxx_check_insert_range(__position, __first, __last, __dist);
	  _Base_iterator __res;
	  if (__dist.second &gt;= __gnu_debug::__dp_sign)
	    __res = _Base::insert(__position.base(),
				  __gnu_debug::__unsafe(__first),
				  __gnu_debug::__unsafe(__last));
	  else
	    __res = _Base::insert(__position.base(), __first, __last);

	  this-&gt;_M_invalidate_all();
	  return iterator(__res, this);
	}
#else
      template&lt;class _InputIterator&gt;
	void
	insert(iterator __position,
	       _InputIterator __first, _InputIterator __last)
	{
	  typename __gnu_debug::_Distance_traits&lt;_InputIterator&gt;::__type __dist;
	  __glibcxx_check_insert_range(__position, __first, __last, __dist);

	  if (__dist.second &gt;= __gnu_debug::__dp_sign)
	    _Base::insert(__position.base(),
			  __gnu_debug::__unsafe(__first),
			  __gnu_debug::__unsafe(__last));
	  else
	    _Base::insert(__position.base(), __first, __last);

	  this-&gt;_M_invalidate_all();
	}
#endif

      void
      pop_front() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	this-&gt;_M_invalidate_if(_Equal(_Base::begin()));
	_Base::pop_front();
      }

      void
      pop_back() _GLIBCXX_NOEXCEPT
      {
	__glibcxx_check_nonempty();
	this-&gt;_M_invalidate_if(_Equal(--_Base::end()));
	_Base::pop_back();
      }

      iterator
#if __cplusplus &gt;= 201103L
      erase(const_iterator __position)
#else
      erase(iterator __position)	
#endif
      {
	__glibcxx_check_erase(__position);
#if __cplusplus &gt;= 201103L
	_Base_const_iterator __victim = __position.base();
#else
	_Base_iterator __victim = __position.base();
#endif
	if (__victim == _Base::begin() || __victim == _Base::end() - 1)
	  {
	    this-&gt;_M_invalidate_if(_Equal(__victim));
	    return iterator(_Base::erase(__victim), this);
	  }
	else
	  {
	    _Base_iterator __res = _Base::erase(__victim);
	    this-&gt;_M_invalidate_all();
	    return iterator(__res, this);
	  }
      }

      iterator
#if __cplusplus &gt;= 201103L
      erase(const_iterator __first, const_iterator __last)
#else
      erase(iterator __first, iterator __last)
#endif
      {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 151. can't currently clear() empty container
	__glibcxx_check_erase_range(__first, __last);

	if (__first.base() == __last.base())
#if __cplusplus &gt;= 201103L
	  return iterator(__first.base()._M_const_cast(), this);
#else
	  return __first;
#endif
	else if (__first.base() == _Base::begin()
		 || __last.base() == _Base::end())
	  {
	    this-&gt;_M_detach_singular();
	    for (_Base_const_iterator __position = __first.base();
		 __position != __last.base(); ++__position)
	      {
		this-&gt;_M_invalidate_if(_Equal(__position));
	      }
	    __try
	      {
		return iterator(_Base::erase(__first.base(), __last.base()),
				this);
	      }
	    __catch(...)
	      {
		this-&gt;_M_revalidate_singular();
		__throw_exception_again;
	      }
	  }
	else
	  {
	    _Base_iterator __res = _Base::erase(__first.base(),
						__last.base());
	    this-&gt;_M_invalidate_all();
	    return iterator(__res, this);
	  }
      }

      void
      swap(deque&amp; __x)
      _GLIBCXX_NOEXCEPT_IF( noexcept(declval&lt;_Base&amp;&gt;().swap(__x)) )
      {
	_Safe::_M_swap(__x);
	_Base::swap(__x);
      }

      void
      clear() _GLIBCXX_NOEXCEPT
      {
	_Base::clear();
	this-&gt;_M_invalidate_all();
      }

      _Base&amp;
      _M_base() _GLIBCXX_NOEXCEPT	{ return *this; }

      const _Base&amp;
      _M_base() const _GLIBCXX_NOEXCEPT	{ return *this; }
    };

#if __cpp_deduction_guides &gt;= 201606
  template&lt;typename _InputIterator, typename _ValT
	     = typename iterator_traits&lt;_InputIterator&gt;::value_type,
	   typename _Allocator = allocator&lt;_ValT&gt;,
	   typename = _RequireInputIter&lt;_InputIterator&gt;,
	   typename = _RequireAllocator&lt;_Allocator&gt;&gt;
    deque(_InputIterator, _InputIterator, _Allocator = _Allocator())
      -&gt; deque&lt;_ValT, _Allocator&gt;;
#endif

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator==(const deque&lt;_Tp, _Alloc&gt;&amp; __lhs,
	       const deque&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() == __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator!=(const deque&lt;_Tp, _Alloc&gt;&amp; __lhs,
	       const deque&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() != __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator&lt;(const deque&lt;_Tp, _Alloc&gt;&amp; __lhs,
	      const deque&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() &lt; __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator&lt;=(const deque&lt;_Tp, _Alloc&gt;&amp; __lhs,
	       const deque&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() &lt;= __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator&gt;=(const deque&lt;_Tp, _Alloc&gt;&amp; __lhs,
	       const deque&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() &gt;= __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline bool
    operator&gt;(const deque&lt;_Tp, _Alloc&gt;&amp; __lhs,
	      const deque&lt;_Tp, _Alloc&gt;&amp; __rhs)
    { return __lhs._M_base() &gt; __rhs._M_base(); }

  template&lt;typename _Tp, typename _Alloc&gt;
    inline void
    swap(deque&lt;_Tp, _Alloc&gt;&amp; __lhs, deque&lt;_Tp, _Alloc&gt;&amp; __rhs)
    _GLIBCXX_NOEXCEPT_IF(noexcept(__lhs.swap(__rhs)))
    { __lhs.swap(__rhs); }

} // namespace __debug
} // namespace std

#endif
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