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Filename: //usr//include/c++/10/debug/map.h

// Debugging map implementation -*- C++ -*-

// Copyright (C) 2003-2020 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 debug/map.h
 *  This file is a GNU debug extension to the Standard C++ Library.
 */

#ifndef _GLIBCXX_DEBUG_MAP_H
#define _GLIBCXX_DEBUG_MAP_H 1

#include <debug/safe_sequence.h>
#include <debug/safe_container.h>
#include <debug/safe_iterator.h>
#include <utility>

namespace std _GLIBCXX_VISIBILITY(default)
{
namespace __debug
{
  /// Class std::map with safety/checking/debug instrumentation.
  template<typename _Key, typename _Tp, typename _Compare = std::less<_Key>,
	   typename _Allocator = std::allocator<std::pair<const _Key, _Tp> > >
    class map
    : public __gnu_debug::_Safe_container<
	map<_Key, _Tp, _Compare, _Allocator>, _Allocator,
	__gnu_debug::_Safe_node_sequence>,
      public _GLIBCXX_STD_C::map<_Key, _Tp, _Compare, _Allocator>
    {
      typedef _GLIBCXX_STD_C::map<
	_Key, _Tp, _Compare, _Allocator>			_Base;
      typedef __gnu_debug::_Safe_container<
	map, _Allocator, __gnu_debug::_Safe_node_sequence>	_Safe;

typedef typename _Base::const_iterator	_Base_const_iterator;
      typedef typename _Base::iterator		_Base_iterator;
      typedef __gnu_debug::_Equal_to<_Base_const_iterator> _Equal;

template<typename _ItT, typename _SeqT, typename _CatT>
	friend class ::__gnu_debug::_Safe_iterator;

public:
      // types:
      typedef _Key					key_type;
      typedef _Tp					mapped_type;
      typedef std::pair<const _Key, _Tp>		value_type;
      typedef _Compare					key_compare;
      typedef _Allocator				allocator_type;
      typedef typename _Base::reference			reference;
      typedef typename _Base::const_reference		const_reference;

typedef __gnu_debug::_Safe_iterator<_Base_iterator, map>
							iterator;
      typedef __gnu_debug::_Safe_iterator<_Base_const_iterator, map>
							const_iterator;

typedef typename _Base::size_type			size_type;
      typedef typename _Base::difference_type		difference_type;
      typedef typename _Base::pointer			pointer;
      typedef typename _Base::const_pointer		const_pointer;
      typedef std::reverse_iterator<iterator>		reverse_iterator;
      typedef std::reverse_iterator<const_iterator>	const_reverse_iterator;

// 23.3.1.1 construct/copy/destroy:

#if __cplusplus < 201103L
      map() : _Base() { }

map(const map& __x)
      : _Base(__x) { }

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

map(initializer_list<value_type> __l,
	  const _Compare& __c = _Compare(),
	  const allocator_type& __a = allocator_type())
      : _Base(__l, __c, __a) { }

explicit
      map(const allocator_type& __a)
      : _Base(__a) { }

map(const map& __m, const allocator_type& __a)
      : _Base(__m, __a) { }

map(map&& __m, const allocator_type& __a)
      noexcept( noexcept(_Base(std::move(__m._M_base()), __a)) )
      : _Safe(std::move(__m._M_safe()), __a),
	_Base(std::move(__m._M_base()), __a) { }

map(initializer_list<value_type> __l, const allocator_type& __a)
      : _Base(__l, __a) { }

template<typename _InputIterator>
	map(_InputIterator __first, _InputIterator __last,
	    const allocator_type& __a)
	: _Base(__gnu_debug::__base(
		  __glibcxx_check_valid_constructor_range(__first, __last)),
		__gnu_debug::__base(__last), __a)
	{ }

~map() = default;
#endif

map(const _Base& __x)
      : _Base(__x) { }

explicit map(const _Compare& __comp,
		   const _Allocator& __a = _Allocator())
      : _Base(__comp, __a) { }

template<typename _InputIterator>
	map(_InputIterator __first, _InputIterator __last,
	    const _Compare& __comp = _Compare(),
	    const _Allocator& __a = _Allocator())
	: _Base(__gnu_debug::__base(
		  __glibcxx_check_valid_constructor_range(__first, __last)),
		__gnu_debug::__base(__last),
		__comp, __a) { }

#if __cplusplus < 201103L
      map&
      operator=(const map& __x)
      {
	this->_M_safe() = __x;
	_M_base() = __x;
	return *this;
      }
#else
      map&
      operator=(const map&) = default;

map&
      operator=(map&&) = default;

map&
      operator=(initializer_list<value_type> __l)
      {
	_M_base() = __l;
	this->_M_invalidate_all();
	return *this;
      }
#endif

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 133. map missing get_allocator()
      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 >= 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

// capacity:
      using _Base::empty;
      using _Base::size;
      using _Base::max_size;

// 23.3.1.2 element access:
      using _Base::operator[];

// _GLIBCXX_RESOLVE_LIB_DEFECTS
      // DR 464. Suggestion for new member functions in standard containers.
      using _Base::at;

// modifiers:
#if __cplusplus >= 201103L
      template<typename... _Args>
	std::pair<iterator, bool>
	emplace(_Args&&... __args)
	{
	  auto __res = _Base::emplace(std::forward<_Args>(__args)...);
	  return { { __res.first, this }, __res.second };
	}

template<typename... _Args>
	iterator
	emplace_hint(const_iterator __pos, _Args&&... __args)
	{
	  __glibcxx_check_insert(__pos);
	  return
	    {
	      _Base::emplace_hint(__pos.base(), std::forward<_Args>(__args)...),
	      this
	    };
	}
#endif

std::pair<iterator, bool>
      insert(const value_type& __x)
      {
	std::pair<_Base_iterator, bool> __res = _Base::insert(__x);
	return std::pair<iterator, bool>(iterator(__res.first, this),
					 __res.second);
      }

#if __cplusplus >= 201103L
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2354. Unnecessary copying when inserting into maps with braced-init
      std::pair<iterator, bool>
      insert(value_type&& __x)
      {
	auto __res = _Base::insert(std::move(__x));
	return { { __res.first, this }, __res.second };
      }

template<typename _Pair, typename = typename
	       std::enable_if<std::is_constructible<value_type,
						    _Pair&&>::value>::type>
	std::pair<iterator, bool>
	insert(_Pair&& __x)
	{
	  auto __res = _Base::insert(std::forward<_Pair>(__x));
	  return { { __res.first, this }, __res.second };
	}
#endif

#if __cplusplus >= 201103L
      void
      insert(std::initializer_list<value_type> __list)
      { _Base::insert(__list); }
#endif

iterator
#if __cplusplus >= 201103L
      insert(const_iterator __position, const value_type& __x)
#else
      insert(iterator __position, const value_type& __x)
#endif
      {
	__glibcxx_check_insert(__position);
	return iterator(_Base::insert(__position.base(), __x), this);
      }

#if __cplusplus >= 201103L
      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2354. Unnecessary copying when inserting into maps with braced-init
      iterator
      insert(const_iterator __position, value_type&& __x)
      {
	__glibcxx_check_insert(__position);
	return { _Base::insert(__position.base(), std::move(__x)), this };
      }

template<typename _Pair, typename = typename
	       std::enable_if<std::is_constructible<value_type,
						    _Pair&&>::value>::type>
	iterator
	insert(const_iterator __position, _Pair&& __x)
	{
	  __glibcxx_check_insert(__position);
	  return
	    {
	      _Base::insert(__position.base(), std::forward<_Pair>(__x)),
	      this
	    };
	}
#endif

template<typename _InputIterator>
	void
	insert(_InputIterator __first, _InputIterator __last)
	{
	  typename __gnu_debug::_Distance_traits<_InputIterator>::__type __dist;
	  __glibcxx_check_valid_range2(__first, __last, __dist);

if (__dist.second >= __gnu_debug::__dp_sign)
	    _Base::insert(__gnu_debug::__unsafe(__first),
			  __gnu_debug::__unsafe(__last));
	  else
	    _Base::insert(__first, __last);
	}

#if __cplusplus > 201402L
      template <typename... _Args>
        pair<iterator, bool>
        try_emplace(const key_type& __k, _Args&&... __args)
        {
	  auto __res = _Base::try_emplace(__k,
					  std::forward<_Args>(__args)...);
	  return { { __res.first, this }, __res.second };
	}

template <typename... _Args>
        pair<iterator, bool>
        try_emplace(key_type&& __k, _Args&&... __args)
        {
	  auto __res = _Base::try_emplace(std::move(__k),
					  std::forward<_Args>(__args)...);
	  return { { __res.first, this }, __res.second };
	}

template <typename... _Args>
        iterator
        try_emplace(const_iterator __hint, const key_type& __k,
                    _Args&&... __args)
        {
	  __glibcxx_check_insert(__hint);
	  return
	    {
	      _Base::try_emplace(__hint.base(), __k,
				 std::forward<_Args>(__args)...),
	      this
	    };
	}

template <typename... _Args>
        iterator
        try_emplace(const_iterator __hint, key_type&& __k, _Args&&... __args)
        {
	  __glibcxx_check_insert(__hint);
	  return
	    {
	      _Base::try_emplace(__hint.base(), std::move(__k),
				 std::forward<_Args>(__args)...),
	      this
	    };
	}

template <typename _Obj>
        std::pair<iterator, bool>
        insert_or_assign(const key_type& __k, _Obj&& __obj)
	{
	  auto __res = _Base::insert_or_assign(__k,
					       std::forward<_Obj>(__obj));
	  return { { __res.first, this }, __res.second };
	}

template <typename _Obj>
        std::pair<iterator, bool>
        insert_or_assign(key_type&& __k, _Obj&& __obj)
	{
	  auto __res = _Base::insert_or_assign(std::move(__k),
					       std::forward<_Obj>(__obj));
	  return { { __res.first, this }, __res.second };
	}

template <typename _Obj>
        iterator
        insert_or_assign(const_iterator __hint,
                         const key_type& __k, _Obj&& __obj)
	{
	  __glibcxx_check_insert(__hint);
	  return
	    {
	      _Base::insert_or_assign(__hint.base(), __k,
				      std::forward<_Obj>(__obj)),
	      this
	    };
	}

template <typename _Obj>
        iterator
        insert_or_assign(const_iterator __hint, key_type&& __k, _Obj&& __obj)
        {
	  __glibcxx_check_insert(__hint);
	  return
	    {
	      _Base::insert_or_assign(__hint.base(), std::move(__k),
				      std::forward<_Obj>(__obj)),
	      this
	    };
	}
#endif // C++17

#if __cplusplus > 201402L
      using node_type = typename _Base::node_type;
      using insert_return_type = _Node_insert_return<iterator, node_type>;

node_type
      extract(const_iterator __position)
      {
	__glibcxx_check_erase(__position);
	this->_M_invalidate_if(_Equal(__position.base()));
	return _Base::extract(__position.base());
      }

node_type
      extract(const key_type& __key)
      {
	const auto __position = find(__key);
	if (__position != end())
	  return extract(__position);
	return {};
      }

insert_return_type
      insert(node_type&& __nh)
      {
	auto __ret = _Base::insert(std::move(__nh));
	return
	  { { __ret.position, this }, __ret.inserted, std::move(__ret.node) };
      }

iterator
      insert(const_iterator __hint, node_type&& __nh)
      {
	__glibcxx_check_insert(__hint);
	return { _Base::insert(__hint.base(), std::move(__nh)), this };
      }

using _Base::merge;
#endif // C++17

#if __cplusplus >= 201103L
      iterator
      erase(const_iterator __position)
      {
	__glibcxx_check_erase(__position);
	this->_M_invalidate_if(_Equal(__position.base()));
	return { _Base::erase(__position.base()), this };
      }

_GLIBCXX_ABI_TAG_CXX11
      iterator
      erase(iterator __position)
      { return erase(const_iterator(__position)); }
#else
      void
      erase(iterator __position)
      {
	__glibcxx_check_erase(__position);
	this->_M_invalidate_if(_Equal(__position.base()));
	_Base::erase(__position.base());
      }
#endif

size_type
      erase(const key_type& __x)
      {
	_Base_iterator __victim = _Base::find(__x);
	if (__victim == _Base::end())
	  return 0;
	else
	  {
	    this->_M_invalidate_if(_Equal(__victim));
	    _Base::erase(__victim);
	    return 1;
	  }
      }

#if __cplusplus >= 201103L
      iterator
      erase(const_iterator __first, const_iterator __last)
      {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 151. can't currently clear() empty container
	__glibcxx_check_erase_range(__first, __last);
	for (_Base_const_iterator __victim = __first.base();
	     __victim != __last.base(); ++__victim)
	  {
	    _GLIBCXX_DEBUG_VERIFY(__victim != _Base::cend(),
				  _M_message(__gnu_debug::__msg_valid_range)
				  ._M_iterator(__first, "first")
				  ._M_iterator(__last, "last"));
	    this->_M_invalidate_if(_Equal(__victim));
	  }

return { _Base::erase(__first.base(), __last.base()), this };
      }
#else
      void
      erase(iterator __first, iterator __last)
      {
	// _GLIBCXX_RESOLVE_LIB_DEFECTS
	// 151. can't currently clear() empty container
	__glibcxx_check_erase_range(__first, __last);
	for (_Base_iterator __victim = __first.base();
	     __victim != __last.base(); ++__victim)
	  {
	    _GLIBCXX_DEBUG_VERIFY(__victim != _Base::end(),
				  _M_message(__gnu_debug::__msg_valid_range)
				  ._M_iterator(__first, "first")
				  ._M_iterator(__last, "last"));
	    this->_M_invalidate_if(_Equal(__victim));
	  }
	_Base::erase(__first.base(), __last.base());
      }
#endif

void
      swap(map& __x)
      _GLIBCXX_NOEXCEPT_IF( noexcept(declval<_Base&>().swap(__x)) )
      {
	_Safe::_M_swap(__x);
	_Base::swap(__x);
      }

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

// observers:
      using _Base::key_comp;
      using _Base::value_comp;

// 23.3.1.3 map operations:
      iterator
      find(const key_type& __x)
      { return iterator(_Base::find(__x), this); }

#if __cplusplus > 201103L
      template<typename _Kt,
	       typename _Req =
		 typename __has_is_transparent<_Compare, _Kt>::type>
	iterator
	find(const _Kt& __x)
	{ return { _Base::find(__x), this }; }
#endif

const_iterator
      find(const key_type& __x) const
      { return const_iterator(_Base::find(__x), this); }

#if __cplusplus > 201103L
      template<typename _Kt,
	       typename _Req =
		 typename __has_is_transparent<_Compare, _Kt>::type>
	const_iterator
	find(const _Kt& __x) const
	{ return { _Base::find(__x), this }; }
#endif

using _Base::count;

iterator
      lower_bound(const key_type& __x)
      { return iterator(_Base::lower_bound(__x), this); }

#if __cplusplus > 201103L
      template<typename _Kt,
	       typename _Req =
		 typename __has_is_transparent<_Compare, _Kt>::type>
	iterator
	lower_bound(const _Kt& __x)
	{ return { _Base::lower_bound(__x), this }; }
#endif

const_iterator
      lower_bound(const key_type& __x) const
      { return const_iterator(_Base::lower_bound(__x), this); }

#if __cplusplus > 201103L
      template<typename _Kt,
	       typename _Req =
		 typename __has_is_transparent<_Compare, _Kt>::type>
	const_iterator
	lower_bound(const _Kt& __x) const
	{ return { _Base::lower_bound(__x), this }; }
#endif

iterator
      upper_bound(const key_type& __x)
      { return iterator(_Base::upper_bound(__x), this); }

#if __cplusplus > 201103L
      template<typename _Kt,
	       typename _Req =
		 typename __has_is_transparent<_Compare, _Kt>::type>
	iterator
	upper_bound(const _Kt& __x)
	{ return { _Base::upper_bound(__x), this }; }
#endif

const_iterator
      upper_bound(const key_type& __x) const
      { return const_iterator(_Base::upper_bound(__x), this); }

#if __cplusplus > 201103L
      template<typename _Kt,
	       typename _Req =
		 typename __has_is_transparent<_Compare, _Kt>::type>
	const_iterator
	upper_bound(const _Kt& __x) const
	{ return { _Base::upper_bound(__x), this }; }
#endif

std::pair<iterator,iterator>
      equal_range(const key_type& __x)
      {
	std::pair<_Base_iterator, _Base_iterator> __res =
	_Base::equal_range(__x);
	return std::make_pair(iterator(__res.first, this),
			      iterator(__res.second, this));
      }

#if __cplusplus > 201103L
      template<typename _Kt,
	       typename _Req =
		 typename __has_is_transparent<_Compare, _Kt>::type>
	std::pair<iterator, iterator>
	equal_range(const _Kt& __x)
	{
	  auto __res = _Base::equal_range(__x);
	  return { { __res.first, this }, { __res.second, this } };
	}
#endif

std::pair<const_iterator,const_iterator>
      equal_range(const key_type& __x) const
      {
	std::pair<_Base_const_iterator, _Base_const_iterator> __res =
	_Base::equal_range(__x);
	return std::make_pair(const_iterator(__res.first, this),
			      const_iterator(__res.second, this));
      }

#if __cplusplus > 201103L
      template<typename _Kt,
	       typename _Req =
		 typename __has_is_transparent<_Compare, _Kt>::type>
	std::pair<const_iterator, const_iterator>
	equal_range(const _Kt& __x) const
	{
	  auto __res = _Base::equal_range(__x);
	  return { { __res.first, this }, { __res.second, this } };
	}
#endif

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

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

#if __cpp_deduction_guides >= 201606

template<typename _InputIterator,
	   typename _Compare = less<__iter_key_t<_InputIterator>>,
	   typename _Allocator = allocator<__iter_to_alloc_t<_InputIterator>>,
	   typename = _RequireInputIter<_InputIterator>,
	   typename = _RequireNotAllocator<_Compare>,
	   typename = _RequireAllocator<_Allocator>>
    map(_InputIterator, _InputIterator,
	_Compare = _Compare(), _Allocator = _Allocator())
    -> map<__iter_key_t<_InputIterator>, __iter_val_t<_InputIterator>,
	   _Compare, _Allocator>;

template<typename _Key, typename _Tp, typename _Compare = less<_Key>,
	   typename _Allocator = allocator<pair<const _Key, _Tp>>,
	   typename = _RequireNotAllocator<_Compare>,
	   typename = _RequireAllocator<_Allocator>>
    map(initializer_list<pair<_Key, _Tp>>,
	_Compare = _Compare(), _Allocator = _Allocator())
    -> map<_Key, _Tp, _Compare, _Allocator>;

template <typename _InputIterator, typename _Allocator,
	    typename = _RequireInputIter<_InputIterator>,
	    typename = _RequireAllocator<_Allocator>>
    map(_InputIterator, _InputIterator, _Allocator)
    -> map<__iter_key_t<_InputIterator>, __iter_val_t<_InputIterator>,
	   less<__iter_key_t<_InputIterator>>, _Allocator>;

template<typename _Key, typename _Tp, typename _Allocator,
	   typename = _RequireAllocator<_Allocator>>
    map(initializer_list<pair<_Key, _Tp>>, _Allocator)
    -> map<_Key, _Tp, less<_Key>, _Allocator>;

#endif // deduction guides

template<typename _Key, typename _Tp,
	   typename _Compare, typename _Allocator>
    inline bool
    operator==(const map<_Key, _Tp, _Compare, _Allocator>& __lhs,
	       const map<_Key, _Tp, _Compare, _Allocator>& __rhs)
    { return __lhs._M_base() == __rhs._M_base(); }

#if __cpp_lib_three_way_comparison
  template<typename _Key, typename _Tp, typename _Compare, typename _Alloc>
    inline __detail::__synth3way_t<pair<const _Key, _Tp>>
    operator<=>(const map<_Key, _Tp, _Compare, _Alloc>& __lhs,
		const map<_Key, _Tp, _Compare, _Alloc>& __rhs)
    { return __lhs._M_base() <=> __rhs._M_base(); }
#else
  template<typename _Key, typename _Tp,
	   typename _Compare, typename _Allocator>
    inline bool
    operator!=(const map<_Key, _Tp, _Compare, _Allocator>& __lhs,
	       const map<_Key, _Tp, _Compare, _Allocator>& __rhs)
    { return __lhs._M_base() != __rhs._M_base(); }

template<typename _Key, typename _Tp,
	   typename _Compare, typename _Allocator>
    inline bool
    operator<(const map<_Key, _Tp, _Compare, _Allocator>& __lhs,
	      const map<_Key, _Tp, _Compare, _Allocator>& __rhs)
    { return __lhs._M_base() < __rhs._M_base(); }

template<typename _Key, typename _Tp,
	   typename _Compare, typename _Allocator>
    inline bool
    operator<=(const map<_Key, _Tp, _Compare, _Allocator>& __lhs,
	       const map<_Key, _Tp, _Compare, _Allocator>& __rhs)
    { return __lhs._M_base() <= __rhs._M_base(); }

template<typename _Key, typename _Tp,
	   typename _Compare, typename _Allocator>
    inline bool
    operator>=(const map<_Key, _Tp, _Compare, _Allocator>& __lhs,
	       const map<_Key, _Tp, _Compare, _Allocator>& __rhs)
    { return __lhs._M_base() >= __rhs._M_base(); }

template<typename _Key, typename _Tp,
	   typename _Compare, typename _Allocator>
    inline bool
    operator>(const map<_Key, _Tp, _Compare, _Allocator>& __lhs,
	      const map<_Key, _Tp, _Compare, _Allocator>& __rhs)
    { return __lhs._M_base() > __rhs._M_base(); }
#endif // three-way comparison

template<typename _Key, typename _Tp,
	   typename _Compare, typename _Allocator>
    inline void
    swap(map<_Key, _Tp, _Compare, _Allocator>& __lhs,
	 map<_Key, _Tp, _Compare, _Allocator>& __rhs)
    _GLIBCXX_NOEXCEPT_IF(noexcept(__lhs.swap(__rhs)))
    { __lhs.swap(__rhs); }

} // namespace __debug
} // namespace std

#endif

./Ninja\.