libcxx/include/__tuple - toolchain/llvm-project - Gitiles

 // -*- C++ -*-
 //===----------------------------------------------------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is dual licensed under the MIT and the University of Illinois Open
 // Source Licenses. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//

 #ifndef _LIBCPP___TUPLE
 #define _LIBCPP___TUPLE

 #include <__config>
 #include <cstddef>
 #include <type_traits>

 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif


 _LIBCPP_BEGIN_NAMESPACE_STD

 template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;

 template <class _Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const _Tp>
     : public tuple_size<_Tp> {};

 template <class _Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_size<volatile _Tp>
     : public tuple_size<_Tp> {};

 template <class _Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_size<const volatile _Tp>
     : public tuple_size<_Tp> {};

 template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;

 template <size_t _Ip, class _Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const _Tp>
 {
 public:
     typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
 };

 template <size_t _Ip, class _Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, volatile _Tp>
 {
 public:
     typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
 };

 template <size_t _Ip, class _Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const volatile _Tp>
 {
 public:
     typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
 };

 template <class _Tp> struct __tuple_like : false_type {};

 template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
 template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
 template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};

 // tuple specializations

 #if !defined(_LIBCPP_HAS_NO_VARIADICS)

 template <size_t...> struct __tuple_indices {};

 template <class _IdxType, _IdxType... _Values>
 struct __integer_sequence {
   template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType>
   using __convert = _ToIndexSeq<_ToIndexType, _Values...>;

   template <size_t _Sp>
   using __to_tuple_indices = __tuple_indices<(_Values + _Sp)...>;
 };

 #if !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
 namespace __detail {

 template<typename _Tp, size_t ..._Extra> struct __repeat;
 template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<__integer_sequence<_Tp, _Np...>, _Extra...> {
   typedef __integer_sequence<_Tp,
                            _Np...,
                            sizeof...(_Np) + _Np...,
                            2 * sizeof...(_Np) + _Np...,
                            3 * sizeof...(_Np) + _Np...,
                            4 * sizeof...(_Np) + _Np...,
                            5 * sizeof...(_Np) + _Np...,
                            6 * sizeof...(_Np) + _Np...,
                            7 * sizeof...(_Np) + _Np...,
                            _Extra...> type;
 };

 template<size_t _Np> struct __parity;
 template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};

 template<> struct __make<0> { typedef __integer_sequence<size_t> type; };
 template<> struct __make<1> { typedef __integer_sequence<size_t, 0> type; };
 template<> struct __make<2> { typedef __integer_sequence<size_t, 0, 1> type; };
 template<> struct __make<3> { typedef __integer_sequence<size_t, 0, 1, 2> type; };
 template<> struct __make<4> { typedef __integer_sequence<size_t, 0, 1, 2, 3> type; };
 template<> struct __make<5> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
 template<> struct __make<6> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
 template<> struct __make<7> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };

 template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
 template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
 template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
 template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
 template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
 template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
 template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
 template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };

 } // namespace detail

 #endif  // !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)

 #if __has_builtin(__make_integer_seq)
 template <size_t _Ep, size_t _Sp>
 using __make_indices_imp =
     typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template
     __to_tuple_indices<_Sp>;
 #else
 template <size_t _Ep, size_t _Sp>
 using __make_indices_imp =
     typename __detail::__make<_Ep - _Sp>::type::template __to_tuple_indices<_Sp>;

 #endif

 template <size_t _Ep, size_t _Sp = 0>
 struct __make_tuple_indices
 {
     static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
     typedef __make_indices_imp<_Ep, _Sp> type;
 };


 template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;

 template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};

 template <size_t _Ip, class ..._Tp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(tuple<_Tp...>&) _NOEXCEPT;

 template <size_t _Ip, class ..._Tp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const typename tuple_element<_Ip, tuple<_Tp...> >::type&
 get(const tuple<_Tp...>&) _NOEXCEPT;

 template <size_t _Ip, class ..._Tp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, tuple<_Tp...> >::type&&
 get(tuple<_Tp...>&&) _NOEXCEPT;

 template <size_t _Ip, class ..._Tp>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
 get(const tuple<_Tp...>&&) _NOEXCEPT;
 #endif

 // pair specializations

 template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};

 template <size_t _Ip, class _T1, class _T2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(pair<_T1, _T2>&) _NOEXCEPT;

 template <size_t _Ip, class _T1, class _T2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
 get(const pair<_T1, _T2>&) _NOEXCEPT;

 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
 template <size_t _Ip, class _T1, class _T2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
 get(pair<_T1, _T2>&&) _NOEXCEPT;

 template <size_t _Ip, class _T1, class _T2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
 get(const pair<_T1, _T2>&&) _NOEXCEPT;
 #endif

 // array specializations

 template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;

 template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};

 template <size_t _Ip, class _Tp, size_t _Size>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 _Tp&
 get(array<_Tp, _Size>&) _NOEXCEPT;

 template <size_t _Ip, class _Tp, size_t _Size>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const _Tp&
 get(const array<_Tp, _Size>&) _NOEXCEPT;

 #if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
 template <size_t _Ip, class _Tp, size_t _Size>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 _Tp&&
 get(array<_Tp, _Size>&&) _NOEXCEPT;

 template <size_t _Ip, class _Tp, size_t _Size>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
 const _Tp&&
 get(const array<_Tp, _Size>&&) _NOEXCEPT;
 #endif

 #if !defined(_LIBCPP_HAS_NO_VARIADICS)


 // __tuple_types

 template <class ..._Tp> struct __tuple_types {};

 template <size_t _Ip>
 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<> >
 {
 public:
     static_assert(_Ip == 0, "tuple_element index out of range");
     static_assert(_Ip != 0, "tuple_element index out of range");
 };

 template <class _Hp, class ..._Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, __tuple_types<_Hp, _Tp...> >
 {
 public:
     typedef _Hp type;
 };

 template <size_t _Ip, class _Hp, class ..._Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
 {
 public:
     typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
 };

 template <class ..._Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
     : public integral_constant<size_t, sizeof...(_Tp)>
 {
 };

 template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};

 // __make_tuple_types

 // __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
 // __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
 // _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>.  If _Tuple is a
 // lvalue_reference type, then __tuple_types<_Types&...> is the result.

 template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
 struct __make_tuple_types_imp;

 template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
 {
     typedef typename remove_reference<_Tp>::type _Tpr;
     typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
                                             typename conditional<is_lvalue_reference<_Tp>::value,
                                                 typename tuple_element<_Sp, _Tpr>::type&,
                                                 typename tuple_element<_Sp, _Tpr>::type>::type>,
                                             _Tp, _Sp+1, _Ep>::type type;
 };

 template <class ..._Types, class _Tp, size_t _Ep>
 struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
 {
     typedef __tuple_types<_Types...> type;
 };

 template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
 struct __make_tuple_types
 {
     static_assert(_Sp <= _Ep, "__make_tuple_types input error");
     typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
 };

 // __tuple_convertible

 template <class, class>
 struct __tuple_convertible_imp : public false_type {};

 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
 struct __tuple_convertible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
     : public integral_constant<bool,
                                is_convertible<_Tp0, _Up0>::value &&
                                __tuple_convertible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};

 template <>
 struct __tuple_convertible_imp<__tuple_types<>, __tuple_types<> >
     : public true_type {};

 template <bool, class, class>
 struct __tuple_convertible_apply : public false_type {};

 template <class _Tp, class _Up>
 struct __tuple_convertible_apply<true, _Tp, _Up>
   : public __tuple_convertible_imp<
       typename __make_tuple_types<_Tp>::type
     , typename __make_tuple_types<_Up>::type
     >
 {};

 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
                                 bool = __tuple_like<_Up>::value>
 struct __tuple_convertible
     : public false_type {};

 template <class _Tp, class _Up>
 struct __tuple_convertible<_Tp, _Up, true, true>
     : public __tuple_convertible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
                                      tuple_size<_Up>::value, _Tp, _Up>
 {};

 // __tuple_constructible

 template <class, class>
 struct __tuple_constructible_imp : public false_type {};

 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
 struct __tuple_constructible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
     : public integral_constant<bool,
                                is_constructible<_Up0, _Tp0>::value &&
                                __tuple_constructible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};

 template <>
 struct __tuple_constructible_imp<__tuple_types<>, __tuple_types<> >
     : public true_type {};

 template <bool _SameSize, class, class>
 struct __tuple_constructible_apply : public false_type {};

 template <class _Tp, class _Up>
 struct __tuple_constructible_apply<true, _Tp, _Up>
   : public __tuple_constructible_imp<
       typename __make_tuple_types<_Tp>::type
     , typename __make_tuple_types<_Up>::type
     >
 {};

 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
                                 bool = __tuple_like<_Up>::value>
 struct __tuple_constructible
     : public false_type {};

 template <class _Tp, class _Up>
 struct __tuple_constructible<_Tp, _Up, true, true>
     : public __tuple_constructible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
                                      tuple_size<_Up>::value, _Tp, _Up>
 {};

 // __tuple_assignable

 template <class, class>
 struct __tuple_assignable_imp : public false_type {};

 template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
 struct __tuple_assignable_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
     : public integral_constant<bool,
                                is_assignable<_Up0&, _Tp0>::value &&
                                __tuple_assignable_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};

 template <>
 struct __tuple_assignable_imp<__tuple_types<>, __tuple_types<> >
     : public true_type {};

 template <bool, class, class>
 struct __tuple_assignable_apply : public false_type {};

 template <class _Tp, class _Up>
 struct __tuple_assignable_apply<true, _Tp, _Up>
   : __tuple_assignable_imp<
       typename __make_tuple_types<_Tp>::type
     , typename __make_tuple_types<_Up>::type
     >
 {};

 template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
                                 bool = __tuple_like<_Up>::value>
 struct __tuple_assignable
     : public false_type {};

 template <class _Tp, class _Up>
 struct __tuple_assignable<_Tp, _Up, true, true>
     : public __tuple_assignable_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
                                     tuple_size<_Up>::value, _Tp, _Up>
 {};

 #endif  // _LIBCPP_HAS_NO_VARIADICS

 _LIBCPP_END_NAMESPACE_STD

 #endif  // _LIBCPP___TUPLE
	// -- C++ --
	//===----------------------------------------------------------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is dual licensed under the MIT and the University of Illinois Open
	// Source Licenses. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//

	#ifndef _LIBCPP___TUPLE
	#define _LIBCPP___TUPLE

	#include <__config>
	#include <cstddef>
	#include <type_traits>

	#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
	#pragma GCC system_header
	#endif


	_LIBCPP_BEGIN_NAMESPACE_STD

	template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;

	template <class _Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_size<const _Tp>
	: public tuple_size<_Tp> {};

	template <class _Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_size<volatile _Tp>
	: public tuple_size<_Tp> {};

	template <class _Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_size<const volatile _Tp>
	: public tuple_size<_Tp> {};

	template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;

	template <size_t _Ip, class _Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const _Tp>
	{
	public:
	typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
	};

	template <size_t _Ip, class _Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, volatile _Tp>
	{
	public:
	typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
	};

	template <size_t _Ip, class _Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const volatile _Tp>
	{
	public:
	typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
	};

	template <class _Tp> struct __tuple_like : false_type {};

	template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
	template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
	template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};

	// tuple specializations

	#if !defined(_LIBCPP_HAS_NO_VARIADICS)

	template <size_t...> struct __tuple_indices {};

	template <class _IdxType, _IdxType... _Values>
	struct __integer_sequence {
	template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType>
	using __convert = _ToIndexSeq<_ToIndexType, _Values...>;

	template <size_t _Sp>
	using __to_tuple_indices = __tuple_indices<(_Values + _Sp)...>;
	};

	#if !__has_builtin(__make_integer_seq) \|\| defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
	namespace __detail {

	template<typename _Tp, size_t ..._Extra> struct __repeat;
	template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<__integer_sequence<_Tp, _Np...>, _Extra...> {
	typedef __integer_sequence<_Tp,
	_Np...,
	sizeof...(_Np) + _Np...,
	2 * sizeof...(_Np) + _Np...,
	3 * sizeof...(_Np) + _Np...,
	4 * sizeof...(_Np) + _Np...,
	5 * sizeof...(_Np) + _Np...,
	6 * sizeof...(_Np) + _Np...,
	7 * sizeof...(_Np) + _Np...,
	_Extra...> type;
	};

	template<size_t _Np> struct __parity;
	template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};

	template<> struct __make<0> { typedef __integer_sequence<size_t> type; };
	template<> struct __make<1> { typedef __integer_sequence<size_t, 0> type; };
	template<> struct __make<2> { typedef __integer_sequence<size_t, 0, 1> type; };
	template<> struct __make<3> { typedef __integer_sequence<size_t, 0, 1, 2> type; };
	template<> struct __make<4> { typedef __integer_sequence<size_t, 0, 1, 2, 3> type; };
	template<> struct __make<5> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
	template<> struct __make<6> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
	template<> struct __make<7> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };

	template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
	template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
	template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
	template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
	template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
	template<> struct __parity<5> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
	template<> struct __parity<6> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
	template<> struct __parity<7> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 7, _Np - 6, _Np - 5, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };

	} // namespace detail

	#endif // !__has_builtin(__make_integer_seq) \|\| defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)

	#if __has_builtin(__make_integer_seq)
	template <size_t _Ep, size_t _Sp>
	using __make_indices_imp =
	typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template
	__to_tuple_indices<_Sp>;
	#else
	template <size_t _Ep, size_t _Sp>
	using __make_indices_imp =
	typename __detail::__make<_Ep - _Sp>::type::template __to_tuple_indices<_Sp>;

	#endif

	template <size_t _Ep, size_t _Sp = 0>
	struct __make_tuple_indices
	{
	static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
	typedef __make_indices_imp<_Ep, _Sp> type;
	};


	template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;

	template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};

	template <size_t _Ip, class ..._Tp>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	typename tuple_element<_Ip, tuple<_Tp...> >::type&
	get(tuple<_Tp...>&) _NOEXCEPT;

	template <size_t _Ip, class ..._Tp>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	const typename tuple_element<_Ip, tuple<_Tp...> >::type&
	get(const tuple<_Tp...>&) _NOEXCEPT;

	template <size_t _Ip, class ..._Tp>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	typename tuple_element<_Ip, tuple<_Tp...> >::type&&
	get(tuple<_Tp...>&&) _NOEXCEPT;

	template <size_t _Ip, class ..._Tp>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
	get(const tuple<_Tp...>&&) _NOEXCEPT;
	#endif

	// pair specializations

	template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};

	template <size_t _Ip, class _T1, class _T2>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	typename tuple_element<_Ip, pair<_T1, _T2> >::type&
	get(pair<_T1, _T2>&) _NOEXCEPT;

	template <size_t _Ip, class _T1, class _T2>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
	get(const pair<_T1, _T2>&) _NOEXCEPT;

	#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
	template <size_t _Ip, class _T1, class _T2>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
	get(pair<_T1, _T2>&&) _NOEXCEPT;

	template <size_t _Ip, class _T1, class _T2>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
	get(const pair<_T1, _T2>&&) _NOEXCEPT;
	#endif

	// array specializations

	template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;

	template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};

	template <size_t _Ip, class _Tp, size_t _Size>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	_Tp&
	get(array<_Tp, _Size>&) _NOEXCEPT;

	template <size_t _Ip, class _Tp, size_t _Size>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	const _Tp&
	get(const array<_Tp, _Size>&) _NOEXCEPT;

	#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
	template <size_t _Ip, class _Tp, size_t _Size>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	_Tp&&
	get(array<_Tp, _Size>&&) _NOEXCEPT;

	template <size_t _Ip, class _Tp, size_t _Size>
	_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
	const _Tp&&
	get(const array<_Tp, _Size>&&) _NOEXCEPT;
	#endif

	#if !defined(_LIBCPP_HAS_NO_VARIADICS)


	// __tuple_types

	template <class ..._Tp> struct __tuple_types {};

	template <size_t _Ip>
	class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<> >
	{
	public:
	static_assert(_Ip == 0, "tuple_element index out of range");
	static_assert(_Ip != 0, "tuple_element index out of range");
	};

	template <class _Hp, class ..._Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, __tuple_types<_Hp, _Tp...> >
	{
	public:
	typedef _Hp type;
	};

	template <size_t _Ip, class _Hp, class ..._Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
	{
	public:
	typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
	};

	template <class ..._Tp>
	class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
	: public integral_constant<size_t, sizeof...(_Tp)>
	{
	};

	template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};

	// __make_tuple_types

	// __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
	// __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
	// _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a
	// lvalue_reference type, then __tuple_types<_Types&...> is the result.

	template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
	struct __make_tuple_types_imp;

	template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
	struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
	{
	typedef typename remove_reference<_Tp>::type _Tpr;
	typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
	typename conditional<is_lvalue_reference<_Tp>::value,
	typename tuple_element<_Sp, _Tpr>::type&,
	typename tuple_element<_Sp, _Tpr>::type>::type>,
	_Tp, _Sp+1, _Ep>::type type;
	};

	template <class ..._Types, class _Tp, size_t _Ep>
	struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
	{
	typedef __tuple_types<_Types...> type;
	};

	template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
	struct __make_tuple_types
	{
	static_assert(_Sp <= _Ep, "__make_tuple_types input error");
	typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
	};

	// __tuple_convertible

	template <class, class>
	struct __tuple_convertible_imp : public false_type {};

	template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
	struct __tuple_convertible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
	: public integral_constant<bool,
	is_convertible<_Tp0, _Up0>::value &&
	__tuple_convertible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};

	template <>
	struct __tuple_convertible_imp<__tuple_types<>, __tuple_types<> >
	: public true_type {};

	template <bool, class, class>
	struct __tuple_convertible_apply : public false_type {};

	template <class _Tp, class _Up>
	struct __tuple_convertible_apply<true, _Tp, _Up>
	: public __tuple_convertible_imp<
	typename __make_tuple_types<_Tp>::type
	, typename __make_tuple_types<_Up>::type
	>
	{};

	template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
	bool = __tuple_like<_Up>::value>
	struct __tuple_convertible
	: public false_type {};

	template <class _Tp, class _Up>
	struct __tuple_convertible<_Tp, _Up, true, true>
	: public __tuple_convertible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
	tuple_size<_Up>::value, _Tp, _Up>
	{};

	// __tuple_constructible

	template <class, class>
	struct __tuple_constructible_imp : public false_type {};

	template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
	struct __tuple_constructible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
	: public integral_constant<bool,
	is_constructible<_Up0, _Tp0>::value &&
	__tuple_constructible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};

	template <>
	struct __tuple_constructible_imp<__tuple_types<>, __tuple_types<> >
	: public true_type {};

	template <bool _SameSize, class, class>
	struct __tuple_constructible_apply : public false_type {};

	template <class _Tp, class _Up>
	struct __tuple_constructible_apply<true, _Tp, _Up>
	: public __tuple_constructible_imp<
	typename __make_tuple_types<_Tp>::type
	, typename __make_tuple_types<_Up>::type
	>
	{};

	template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
	bool = __tuple_like<_Up>::value>
	struct __tuple_constructible
	: public false_type {};

	template <class _Tp, class _Up>
	struct __tuple_constructible<_Tp, _Up, true, true>
	: public __tuple_constructible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
	tuple_size<_Up>::value, _Tp, _Up>
	{};

	// __tuple_assignable

	template <class, class>
	struct __tuple_assignable_imp : public false_type {};

	template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
	struct __tuple_assignable_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
	: public integral_constant<bool,
	is_assignable<_Up0&, _Tp0>::value &&
	__tuple_assignable_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};

	template <>
	struct __tuple_assignable_imp<__tuple_types<>, __tuple_types<> >
	: public true_type {};

	template <bool, class, class>
	struct __tuple_assignable_apply : public false_type {};

	template <class _Tp, class _Up>
	struct __tuple_assignable_apply<true, _Tp, _Up>
	: __tuple_assignable_imp<
	typename __make_tuple_types<_Tp>::type
	, typename __make_tuple_types<_Up>::type
	>
	{};

	template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
	bool = __tuple_like<_Up>::value>
	struct __tuple_assignable
	: public false_type {};

	template <class _Tp, class _Up>
	struct __tuple_assignable<_Tp, _Up, true, true>
	: public __tuple_assignable_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
	tuple_size<_Up>::value, _Tp, _Up>
	{};

	#endif // _LIBCPP_HAS_NO_VARIADICS

	_LIBCPP_END_NAMESPACE_STD

	#endif // _LIBCPP___TUPLE