include/utility - chromium/llvm-project/libcxx - Git at Google

 // -*- C++ -*-
 //===-------------------------- utility -----------------------------------===//
 //
 // The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//

 #ifndef _LIBCPP_UTILITY
 #define _LIBCPP_UTILITY

 /*
  utility synopsis

 namespace std
 {

 template <class T>
  void
  swap(T& a, T& b);

 namespace rel_ops
 {
  template<class T> bool operator!=(const T&, const T&);
  template<class T> bool operator> (const T&, const T&);
  template<class T> bool operator<=(const T&, const T&);
  template<class T> bool operator>=(const T&, const T&);
 }

 template<class T> void swap(T& a, T& b);
 template <class T, size_t N> void swap(T (&a)[N], T (&b)[N]);

 template <class T, class U> T&& forward(U&&);
 template <class T> typename remove_reference<T>::type&& move(T&&);

 template <class T>
  typename conditional
  <
  !has_nothrow_move_constructor<T>::value && has_copy_constructor<T>::value,
  const T&,
  T&&
  >::type
  move_if_noexcept(T& x);

 template <class T> typename add_rvalue_reference<T>::type declval() noexcept;

 template <class T1, class T2>
 struct pair
 {
  typedef T1 first_type;
  typedef T2 second_type;

  T1 first;
  T2 second;

  pair(const pair&) = default;
  constexpr pair();
  pair(const T1& x, const T2& y);
  template <class U, class V> pair(U&& x, V&& y);
  template <class U, class V> pair(const pair<U, V>& p);
  template <class U, class V> pair(pair<U, V>&& p);
  template <class... Args1, class... Args2>
  pair(piecewise_construct_t, tuple<Args1...> first_args,
  tuple<Args2...> second_args);

  template <class U, class V> pair& operator=(const pair<U, V>& p);
  pair& operator=(pair&& p);
  template <class U, class V> pair& operator=(pair<U, V>&& p);

  void swap(pair& p);
 };

 template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&);
 template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&);
 template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&);
 template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&);
 template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&);
 template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&);

 template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&);
 template <class T1, class T2> void swap(pair<T1, T2>& x, pair<T1, T2>& y);

 struct piecewise_construct_t { };
 constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();

 template <class T> class tuple_size;
 template <size_t I, class T> class tuple_element;

 template <class T1, class T2> struct tuple_size<std::pair<T1, T2> >;
 template <class T1, class T2> struct tuple_element<0, std::pair<T1, T2> >;
 template <class T1, class T2> struct tuple_element<1, std::pair<T1, T2> >;

 template<size_t I, class T1, class T2>
  typename tuple_element<I, std::pair<T1, T2> >::type&
  get(std::pair<T1, T2>&);

 template<size_t I, class T1, class T2>
  const typename const tuple_element<I, std::pair<T1, T2> >::type&
  get(const std::pair<T1, T2>&);

 } // std

 */

 #include <__config>
 #include <__tuple>
 #include <type_traits>

 #pragma GCC system_header

 _LIBCPP_BEGIN_NAMESPACE_STD

 namespace rel_ops
 {

 template<class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator!=(const _Tp& __x, const _Tp& __y)
 {
  return !(__x == __y);
 }

 template<class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator> (const _Tp& __x, const _Tp& __y)
 {
  return __y < __x;
 }

 template<class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator<=(const _Tp& __x, const _Tp& __y)
 {
  return !(__y < __x);
 }

 template<class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator>=(const _Tp& __x, const _Tp& __y)
 {
  return !(__x < __y);
 }

 } // rel_ops

 // swap_ranges

 template <class _ForwardIterator1, class _ForwardIterator2>
 inline _LIBCPP_INLINE_VISIBILITY
 _ForwardIterator2
 swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
 {
  for(; __first1 != __last1; ++__first1, ++__first2)
  swap(*__first1, *__first2);
  return __first2;
 }

 template<class _Tp, size_t _N>
 inline _LIBCPP_INLINE_VISIBILITY
 void
 swap(_Tp (&__a)[_N], _Tp (&__b)[_N])
 {
  _STD::swap_ranges(__a, __a + _N, __b);
 }

 template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
 typename conditional
 <
  !has_nothrow_move_constructor<_Tp>::value && has_copy_constructor<_Tp>::value,
  const _Tp&,
  _Tp&&
 >::type
 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
 const _Tp&
 #endif
 move_if_noexcept(_Tp& __x)
 {
  return _STD::move(__x);
 }

 struct piecewise_construct_t { };
 //constexpr
 extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();

 template <class _T1, class _T2> struct pair;
 template <class _T1, class _T2> void swap(pair<_T1, _T2>&, pair<_T1, _T2>&);

 template <class _T1, class _T2>
 struct pair
 {
  typedef _T1 first_type;
  typedef _T2 second_type;

  _T1 first;
  _T2 second;

  _LIBCPP_INLINE_VISIBILITY pair() : first(), second() {}

  _LIBCPP_INLINE_VISIBILITY pair(const _T1& __x, const _T2& __y)
  : first(__x), second(__y) {}

 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

  template <class _U1, class _U2,
  class = typename enable_if<is_convertible<_U1, first_type >::value &&
  is_convertible<_U2, second_type>::value>::type>
  _LIBCPP_INLINE_VISIBILITY
  pair(_U1&& __u1, _U2&& __u2)
  : first(_STD::forward<_U1>(__u1)),
  second(_STD::forward<_U2>(__u2))
  {}

 #ifndef _LIBCPP_HAS_NO_VARIADICS

  template<class _Tuple,
  class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
  _LIBCPP_INLINE_VISIBILITY
  pair(_Tuple&& __p)
  : first(_STD::forward<typename tuple_element<0,
  typename __make_tuple_types<_Tuple>::type>::type>(get<0>(__p))),
  second(_STD::forward<typename tuple_element<1,
  typename __make_tuple_types<_Tuple>::type>::type>(get<1>(__p)))
  {}

  template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
  pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args,
  tuple<_Args2...> __second_args)
  : pair(__pc, __first_args, __second_args,
  typename __make_tuple_indices<sizeof...(_Args1)>::type(),
  typename __make_tuple_indices<sizeof...(_Args2) >::type())
  {}

  template <class _Tuple,
  class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type>
  pair&
  operator=(_Tuple&& __p)
  {
  typedef typename __make_tuple_types<_Tuple>::type _TupleRef;
  typedef typename tuple_element<0, _TupleRef>::type _U0;
  typedef typename tuple_element<1, _TupleRef>::type _U1;
  first = _STD::forward<_U0>(_STD::get<0>(__p));
  second = _STD::forward<_U1>(_STD::get<1>(__p));
  return *this;
  }

 #endif // _LIBCPP_HAS_NO_VARIADICS

 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
  template<class _U1, class _U2>
  _LIBCPP_INLINE_VISIBILITY pair(const pair<_U1, _U2>& __p)
  : first(__p.first), second(__p.second) {}
 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
  void _LIBCPP_INLINE_VISIBILITY swap(pair& __p) {_STD::swap(*this, __p);}
 private:

 #ifndef _LIBCPP_HAS_NO_VARIADICS
  template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
  pair(piecewise_construct_t,
  tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
  __tuple_indices<_I1...>, __tuple_indices<_I2...>);
 #endif // _LIBCPP_HAS_NO_VARIADICS
 };

 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
  return __x.first == __y.first && __x.second == __y.second;
 }

 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
  return !(__x == __y);
 }

 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
  return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
 }

 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
  return __y < __x;
 }

 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
  return !(__x < __y);
 }

 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
 {
  return !(__y < __x);
 }

 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
 void
 swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
 {
  swap(__x.first, __y.first);
  swap(__x.second, __y.second);
 }

 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _Tp> class reference_wrapper;

 template <class _Tp>
 struct ___make_pair_return
 {
  typedef _Tp type;
 };

 template <class _Tp>
 struct ___make_pair_return<reference_wrapper<_Tp>>
 {
  typedef _Tp& type;
 };

 template <class _Tp>
 struct __make_pair_return
 {
  typedef typename ___make_pair_return<typename decay<_Tp>::type>::type type;
 };

 template <class _T1, class _T2>
 inline
 pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
 make_pair(_T1&& __t1, _T2&& __t2)
 {
  return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
  (_STD::forward<_T1>(__t1), _STD::forward<_T2>(__t2));
 }

 #else // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 template <class _T1, class _T2>
 inline _LIBCPP_INLINE_VISIBILITY
 pair<_T1,_T2>
 make_pair(_T1 __x, _T2 __y)
 {
  return pair<_T1, _T2>(__x, __y);
 }

 #endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

 #ifndef _LIBCPP_HAS_NO_VARIADICS

 template <class _T1, class _T2>
  class tuple_size<pair<_T1, _T2> > : public integral_constant<size_t, 2> {};

 template <class _T1, class _T2>
  class tuple_size<const pair<_T1, _T2> > : public integral_constant<size_t, 2> {};

 template <class _T1, class _T2>
 class tuple_element<0, pair<_T1, _T2> >
 {
 public:
  typedef _T1 type;
 };

 template <class _T1, class _T2>
 class tuple_element<1, pair<_T1, _T2> >
 {
 public:
  typedef _T2 type;
 };

 template <class _T1, class _T2>
 class tuple_element<0, const pair<_T1, _T2> >
 {
 public:
  typedef const _T1 type;
 };

 template <class _T1, class _T2>
 class tuple_element<1, const pair<_T1, _T2> >
 {
 public:
  typedef const _T2 type;
 };

 template <size_t _Ip> struct __get_pair;

 template <>
 struct __get_pair<0>
 {
  template <class _T1, class _T2>
  static
  _LIBCPP_INLINE_VISIBILITY
  _T1&
  get(pair<_T1, _T2>& __p) {return __p.first;}

  template <class _T1, class _T2>
  static
  _LIBCPP_INLINE_VISIBILITY
  const _T1&
  get(const pair<_T1, _T2>& __p) {return __p.first;}
 };

 template <>
 struct __get_pair<1>
 {
  template <class _T1, class _T2>
  static
  _LIBCPP_INLINE_VISIBILITY
  _T2&
  get(pair<_T1, _T2>& __p) {return __p.second;}

  template <class _T1, class _T2>
  static
  _LIBCPP_INLINE_VISIBILITY
  const _T2&
  get(const pair<_T1, _T2>& __p) {return __p.second;}
 };

 template <size_t _Ip, class _T1, class _T2>
 _LIBCPP_INLINE_VISIBILITY inline
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(pair<_T1, _T2>& __p)
 {
  return __get_pair<_Ip>::get(__p);
 }

 template <size_t _Ip, class _T1, class _T2>
 _LIBCPP_INLINE_VISIBILITY inline
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(const pair<_T1, _T2>& __p)
 {
  return __get_pair<_Ip>::get(__p);
 }

 #endif // _LIBCPP_HAS_NO_VARIADICS

 _LIBCPP_END_NAMESPACE_STD

 #endif // _LIBCPP_UTILITY
	// -- C++ --
	//===-------------------------- utility -----------------------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//

	#ifndef _LIBCPP_UTILITY
	#define _LIBCPP_UTILITY

	/*
	utility synopsis

	namespace std
	{

	template <class T>
	void
	swap(T& a, T& b);

	namespace rel_ops
	{
	template<class T> bool operator!=(const T&, const T&);
	template<class T> bool operator> (const T&, const T&);
	template<class T> bool operator<=(const T&, const T&);
	template<class T> bool operator>=(const T&, const T&);
	}

	template<class T> void swap(T& a, T& b);
	template <class T, size_t N> void swap(T (&a)[N], T (&b)[N]);

	template <class T, class U> T&& forward(U&&);
	template <class T> typename remove_reference<T>::type&& move(T&&);

	template <class T>
	typename conditional
	<
	!has_nothrow_move_constructor<T>::value && has_copy_constructor<T>::value,
	const T&,
	T&&
	>::type
	move_if_noexcept(T& x);

	template <class T> typename add_rvalue_reference<T>::type declval() noexcept;

	template <class T1, class T2>
	struct pair
	{
	typedef T1 first_type;
	typedef T2 second_type;

	T1 first;
	T2 second;

	pair(const pair&) = default;
	constexpr pair();
	pair(const T1& x, const T2& y);
	template <class U, class V> pair(U&& x, V&& y);
	template <class U, class V> pair(const pair<U, V>& p);
	template <class U, class V> pair(pair<U, V>&& p);
	template <class... Args1, class... Args2>
	pair(piecewise_construct_t, tuple<Args1...> first_args,
	tuple<Args2...> second_args);

	template <class U, class V> pair& operator=(const pair<U, V>& p);
	pair& operator=(pair&& p);
	template <class U, class V> pair& operator=(pair<U, V>&& p);

	void swap(pair& p);
	};

	template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&);
	template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&);
	template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&);
	template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&);
	template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&);
	template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&);

	template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&);
	template <class T1, class T2> void swap(pair<T1, T2>& x, pair<T1, T2>& y);

	struct piecewise_construct_t { };
	constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();

	template <class T> class tuple_size;
	template <size_t I, class T> class tuple_element;

	template <class T1, class T2> struct tuple_size<std::pair<T1, T2> >;
	template <class T1, class T2> struct tuple_element<0, std::pair<T1, T2> >;
	template <class T1, class T2> struct tuple_element<1, std::pair<T1, T2> >;

	template<size_t I, class T1, class T2>
	typename tuple_element<I, std::pair<T1, T2> >::type&
	get(std::pair<T1, T2>&);

	template<size_t I, class T1, class T2>
	const typename const tuple_element<I, std::pair<T1, T2> >::type&
	get(const std::pair<T1, T2>&);

	} // std

	*/

	#include <__config>
	#include <__tuple>
	#include <type_traits>

	#pragma GCC system_header

	_LIBCPP_BEGIN_NAMESPACE_STD

	namespace rel_ops
	{

	template<class _Tp>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator!=(const _Tp& __x, const _Tp& __y)
	{
	return !(__x == __y);
	}

	template<class _Tp>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator> (const _Tp& __x, const _Tp& __y)
	{
	return __y < __x;
	}

	template<class _Tp>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator<=(const _Tp& __x, const _Tp& __y)
	{
	return !(__y < __x);
	}

	template<class _Tp>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator>=(const _Tp& __x, const _Tp& __y)
	{
	return !(__x < __y);
	}

	} // rel_ops

	// swap_ranges

	template <class _ForwardIterator1, class _ForwardIterator2>
	inline _LIBCPP_INLINE_VISIBILITY
	_ForwardIterator2
	swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
	{
	for(; __first1 != __last1; ++__first1, ++__first2)
	swap(__first1, __first2);
	return __first2;
	}

	template<class _Tp, size_t _N>
	inline _LIBCPP_INLINE_VISIBILITY
	void
	swap(_Tp (&__a)[_N], _Tp (&__b)[_N])
	{
	_STD::swap_ranges(__a, __a + _N, __b);
	}

	template <class _Tp>
	inline _LIBCPP_INLINE_VISIBILITY
	#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
	typename conditional
	<
	!has_nothrow_move_constructor<_Tp>::value && has_copy_constructor<_Tp>::value,
	const _Tp&,
	_Tp&&
	>::type
	#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
	const _Tp&
	#endif
	move_if_noexcept(_Tp& __x)
	{
	return _STD::move(__x);
	}

	struct piecewise_construct_t { };
	//constexpr
	extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();

	template <class _T1, class _T2> struct pair;
	template <class _T1, class _T2> void swap(pair<_T1, _T2>&, pair<_T1, _T2>&);

	template <class _T1, class _T2>
	struct pair
	{
	typedef _T1 first_type;
	typedef _T2 second_type;

	_T1 first;
	_T2 second;

	_LIBCPP_INLINE_VISIBILITY pair() : first(), second() {}

	_LIBCPP_INLINE_VISIBILITY pair(const _T1& __x, const _T2& __y)
	: first(__x), second(__y) {}

	#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

	template <class _U1, class _U2,
	class = typename enable_if<is_convertible<_U1, first_type >::value &&
	is_convertible<_U2, second_type>::value>::type>
	_LIBCPP_INLINE_VISIBILITY
	pair(_U1&& __u1, _U2&& __u2)
	: first(_STD::forward<_U1>(__u1)),
	second(_STD::forward<_U2>(__u2))
	{}

	#ifndef _LIBCPP_HAS_NO_VARIADICS

	template<class _Tuple,
	class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
	_LIBCPP_INLINE_VISIBILITY
	pair(_Tuple&& __p)
	: first(_STD::forward<typename tuple_element<0,
	typename __make_tuple_types<_Tuple>::type>::type>(get<0>(__p))),
	second(_STD::forward<typename tuple_element<1,
	typename __make_tuple_types<_Tuple>::type>::type>(get<1>(__p)))
	{}

	template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
	pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args,
	tuple<_Args2...> __second_args)
	: pair(__pc, __first_args, __second_args,
	typename __make_tuple_indices<sizeof...(_Args1)>::type(),
	typename __make_tuple_indices<sizeof...(_Args2) >::type())
	{}

	template <class _Tuple,
	class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type>
	pair&
	operator=(_Tuple&& __p)
	{
	typedef typename __make_tuple_types<_Tuple>::type _TupleRef;
	typedef typename tuple_element<0, _TupleRef>::type _U0;
	typedef typename tuple_element<1, _TupleRef>::type _U1;
	first = _STD::forward<_U0>(_STD::get<0>(__p));
	second = _STD::forward<_U1>(_STD::get<1>(__p));
	return *this;
	}

	#endif // _LIBCPP_HAS_NO_VARIADICS

	#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
	template<class _U1, class _U2>
	_LIBCPP_INLINE_VISIBILITY pair(const pair<_U1, _U2>& __p)
	: first(__p.first), second(__p.second) {}
	#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
	void _LIBCPP_INLINE_VISIBILITY swap(pair& __p) {_STD::swap(*this, __p);}
	private:

	#ifndef _LIBCPP_HAS_NO_VARIADICS
	template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
	pair(piecewise_construct_t,
	tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
	__tuple_indices<_I1...>, __tuple_indices<_I2...>);
	#endif // _LIBCPP_HAS_NO_VARIADICS
	};

	template <class _T1, class _T2>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
	{
	return __x.first == __y.first && __x.second == __y.second;
	}

	template <class _T1, class _T2>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
	{
	return !(__x == __y);
	}

	template <class _T1, class _T2>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
	{
	return __x.first < __y.first \|\| (!(__y.first < __x.first) && __x.second < __y.second);
	}

	template <class _T1, class _T2>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
	{
	return __y < __x;
	}

	template <class _T1, class _T2>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
	{
	return !(__x < __y);
	}

	template <class _T1, class _T2>
	inline _LIBCPP_INLINE_VISIBILITY
	bool
	operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
	{
	return !(__y < __x);
	}

	template <class _T1, class _T2>
	inline _LIBCPP_INLINE_VISIBILITY
	void
	swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
	{
	swap(__x.first, __y.first);
	swap(__x.second, __y.second);
	}

	#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

	template <class _Tp> class reference_wrapper;

	template <class _Tp>
	struct ___make_pair_return
	{
	typedef _Tp type;
	};

	template <class _Tp>
	struct ___make_pair_return<reference_wrapper<_Tp>>
	{
	typedef _Tp& type;
	};

	template <class _Tp>
	struct __make_pair_return
	{
	typedef typename ___make_pair_return<typename decay<_Tp>::type>::type type;
	};

	template <class _T1, class _T2>
	inline
	pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
	make_pair(_T1&& __t1, _T2&& __t2)
	{
	return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
	(_STD::forward<_T1>(__t1), _STD::forward<_T2>(__t2));
	}

	#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES

	template <class _T1, class _T2>
	inline _LIBCPP_INLINE_VISIBILITY
	pair<_T1,_T2>
	make_pair(_T1 __x, _T2 __y)
	{
	return pair<_T1, _T2>(__x, __y);
	}

	#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES

	#ifndef _LIBCPP_HAS_NO_VARIADICS

	template <class _T1, class _T2>
	class tuple_size<pair<_T1, _T2> > : public integral_constant<size_t, 2> {};

	template <class _T1, class _T2>
	class tuple_size<const pair<_T1, _T2> > : public integral_constant<size_t, 2> {};

	template <class _T1, class _T2>
	class tuple_element<0, pair<_T1, _T2> >
	{
	public:
	typedef _T1 type;
	};

	template <class _T1, class _T2>
	class tuple_element<1, pair<_T1, _T2> >
	{
	public:
	typedef _T2 type;
	};

	template <class _T1, class _T2>
	class tuple_element<0, const pair<_T1, _T2> >
	{
	public:
	typedef const _T1 type;
	};

	template <class _T1, class _T2>
	class tuple_element<1, const pair<_T1, _T2> >
	{
	public:
	typedef const _T2 type;
	};

	template <size_t _Ip> struct __get_pair;

	template <>
	struct __get_pair<0>
	{
	template <class _T1, class _T2>
	static
	_LIBCPP_INLINE_VISIBILITY
	_T1&
	get(pair<_T1, _T2>& __p) {return __p.first;}

	template <class _T1, class _T2>
	static
	_LIBCPP_INLINE_VISIBILITY
	const _T1&
	get(const pair<_T1, _T2>& __p) {return __p.first;}
	};

	template <>
	struct __get_pair<1>
	{
	template <class _T1, class _T2>
	static
	_LIBCPP_INLINE_VISIBILITY
	_T2&
	get(pair<_T1, _T2>& __p) {return __p.second;}

	template <class _T1, class _T2>
	static
	_LIBCPP_INLINE_VISIBILITY
	const _T2&
	get(const pair<_T1, _T2>& __p) {return __p.second;}
	};

	template <size_t _Ip, class _T1, class _T2>
	_LIBCPP_INLINE_VISIBILITY inline
	typename tuple_element<_Ip, pair<_T1, _T2> >::type&
	get(pair<_T1, _T2>& __p)
	{
	return __get_pair<_Ip>::get(__p);
	}

	template <size_t _Ip, class _T1, class _T2>
	_LIBCPP_INLINE_VISIBILITY inline
	const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
	get(const pair<_T1, _T2>& __p)
	{
	return __get_pair<_Ip>::get(__p);
	}

	#endif // _LIBCPP_HAS_NO_VARIADICS

	_LIBCPP_END_NAMESPACE_STD

	#endif // _LIBCPP_UTILITY