include/__tuple - LeafOS-Project/android_external_libcxx - 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 <class ..._Tp>
 class _LIBCPP_TYPE_VIS_ONLY tuple_size<tuple<_Tp...> >
     : public integral_constant<size_t, sizeof...(_Tp)>
 {
 };

 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 {};

 #if !__has_builtin(__type_pack_element)

 namespace __indexer_detail {

 template <size_t _Idx, class _Tp>
 struct __indexed { using type = _Tp; };

 template <class _Types, class _Indexes> struct __indexer;

 template <class ..._Types, size_t ..._Idx>
 struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>>
     : __indexed<_Idx, _Types>...
 {};

 template <size_t _Idx, class _Tp>
 __indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&);

 } // namespace __indexer_detail

 template <size_t _Idx, class ..._Types>
 using __type_pack_element = typename decltype(
     __indexer_detail::__at_index<_Idx>(
         __indexer_detail::__indexer<
             __tuple_types<_Types...>,
             typename __make_tuple_indices<sizeof...(_Types)>::type
         >{})
   )::type;
 #endif

 template <size_t _Ip, class ..._Types>
 class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Types...>>
 {
 public:
     static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
     typedef __type_pack_element<_Ip, _Types...> 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 {};

 template <bool _ApplyLV, bool _ApplyConst, bool _ApplyVolatile>
 struct __apply_cv_mf;
 template <>
 struct __apply_cv_mf<false, false, false> {
   template <class _Tp> using __apply = _Tp;
 };
 template <>
 struct __apply_cv_mf<false, true, false> {
   template <class _Tp> using __apply = const _Tp;
 };
 template <>
 struct __apply_cv_mf<false, false, true> {
   template <class _Tp> using __apply = volatile _Tp;
 };
 template <>
 struct __apply_cv_mf<false, true, true> {
   template <class _Tp> using __apply = const volatile _Tp;
 };
 template <>
 struct __apply_cv_mf<true, false, false> {
   template <class _Tp> using __apply = _Tp&;
 };
 template <>
 struct __apply_cv_mf<true, true, false> {
   template <class _Tp> using __apply = const _Tp&;
 };
 template <>
 struct __apply_cv_mf<true, false, true> {
   template <class _Tp> using __apply = volatile _Tp&;
 };
 template <>
 struct __apply_cv_mf<true, true, true> {
   template <class _Tp> using __apply = const volatile _Tp&;
 };
 template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type>
 using __apply_cv_t = __apply_cv_mf<
     is_lvalue_reference<_Tp>::value,
     is_const<_RawTp>::value,
     is_volatile<_RawTp>::value>;

 // __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 _TupleIndices>
 struct __make_tuple_types_flat;

 template <template <class...> class _Tuple, class ..._Types, size_t ..._Idx>
 struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> {
   // Specialization for pair, tuple, and __tuple_types
   template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
   using __apply_quals = __tuple_types<
       typename _ApplyFn::template __apply<__type_pack_element<_Idx, _Types...>>...
     >;
 };

 template <class _Vt, size_t _Np, size_t ..._Idx>
 struct __make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_Idx...>> {
   template <size_t>
   using __value_type = _Vt;
   template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
   using __apply_quals = __tuple_types<
       typename _ApplyFn::template __apply<__value_type<_Idx>>...
     >;
 };

 template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value,
           size_t _Sp = 0,
           bool _SameSize = (_Ep == tuple_size<typename remove_reference<_Tp>::type>::value)>
 struct __make_tuple_types
 {
     static_assert(_Sp <= _Ep, "__make_tuple_types input error");
     using _RawTp = typename remove_cv<typename remove_reference<_Tp>::type>::type;
     using _Maker = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>;
     using type = typename _Maker::template __apply_quals<_Tp>;
 };

 template <class ..._Types, size_t _Ep>
 struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> {
   typedef __tuple_types<_Types...> type;
 };

 template <class ..._Types, size_t _Ep>
 struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> {
   typedef __tuple_types<_Types...> type;
 };

 template <bool ..._Preds>
 struct __all_dummy;

 template <bool ..._Pred>
 using __all = is_same<__all_dummy<_Pred...>, __all_dummy<(_Pred, true)...>>;

 struct __tuple_sfinae_base {
   template <template <class, class...> class _Trait,
             class ..._LArgs, class ..._RArgs>
   static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>)
     -> __all<typename enable_if<_Trait<_LArgs, _RArgs>::value, bool>::type{true}...>;
   template <template <class...> class>
   static auto __do_test(...) -> false_type;

   template <class _FromArgs, class _ToArgs>
   using __constructible = decltype(__do_test<is_constructible>(_ToArgs{}, _FromArgs{}));
   template <class _FromArgs, class _ToArgs>
   using __convertible = decltype(__do_test<is_convertible>(_FromArgs{}, _ToArgs{}));
   template <class _FromArgs, class _ToArgs>
   using __assignable = decltype(__do_test<is_assignable>(_ToArgs{}, _FromArgs{}));
 };

 // __tuple_convertible

 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_sfinae_base::__convertible<
       typename __make_tuple_types<_Tp>::type
     , typename __make_tuple_types<_Up>::type
     >
 {};

 // __tuple_constructible

 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_sfinae_base::__constructible<
       typename __make_tuple_types<_Tp>::type
     , typename __make_tuple_types<_Up>::type
     >
 {};

 // __tuple_assignable

 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_sfinae_base::__assignable<
       typename __make_tuple_types<_Tp>::type
     , typename __make_tuple_types<_Up&>::type
     >
 {};


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

 #if _LIBCPP_STD_VER > 11
 template <size_t _Ip, class ..._Tp>
 using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type;
 #endif

 #endif  // _LIBCPP_HAS_NO_VARIADICS

 #ifndef _LIBCPP_CXX03_LANG
 template <bool _IsTuple, class _SizeTrait, size_t _Expected>
 struct __tuple_like_with_size_imp : false_type {};

 template <class _SizeTrait, size_t _Expected>
 struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected>
     : integral_constant<bool, _SizeTrait::value == _Expected> {};

 template <class _Tuple, size_t _ExpectedSize,
           class _RawTuple = typename __uncvref<_Tuple>::type>
 using __tuple_like_with_size = __tuple_like_with_size_imp<
                                    __tuple_like<_RawTuple>::value,
                                    tuple_size<_RawTuple>, _ExpectedSize
                               >;

 struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
     template <class ...>
     static constexpr bool __enable_default() { return false; }
     template <class ...>
     static constexpr bool __enable_explicit() { return false; }
     template <class ...>
     static constexpr bool __enable_implicit() { return false; }
     template <class ...>
     static constexpr bool __enable_assign() { return false; }
 };
 #endif

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

	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 {};

	#if !__has_builtin(__type_pack_element)

	namespace __indexer_detail {

	template <size_t _Idx, class _Tp>
	struct __indexed { using type = _Tp; };

	template <class _Types, class _Indexes> struct __indexer;

	template <class ..._Types, size_t ..._Idx>
	struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>>
	: __indexed<_Idx, _Types>...
	{};

	template <size_t _Idx, class _Tp>
	__indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&);

	} // namespace __indexer_detail

	template <size_t _Idx, class ..._Types>
	using __type_pack_element = typename decltype(
	__indexer_detail::__at_index<_Idx>(
	__indexer_detail::__indexer<
	__tuple_types<_Types...>,
	typename __make_tuple_indices<sizeof...(_Types)>::type
	>{})
	)::type;
	#endif

	template <size_t _Ip, class ..._Types>
	class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Types...>>
	{
	public:
	static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
	typedef __type_pack_element<_Ip, _Types...> 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 {};

	template <bool _ApplyLV, bool _ApplyConst, bool _ApplyVolatile>
	struct __apply_cv_mf;
	template <>
	struct __apply_cv_mf<false, false, false> {
	template <class _Tp> using __apply = _Tp;
	};
	template <>
	struct __apply_cv_mf<false, true, false> {
	template <class _Tp> using __apply = const _Tp;
	};
	template <>
	struct __apply_cv_mf<false, false, true> {
	template <class _Tp> using __apply = volatile _Tp;
	};
	template <>
	struct __apply_cv_mf<false, true, true> {
	template <class _Tp> using __apply = const volatile _Tp;
	};
	template <>
	struct __apply_cv_mf<true, false, false> {
	template <class _Tp> using __apply = _Tp&;
	};
	template <>
	struct __apply_cv_mf<true, true, false> {
	template <class _Tp> using __apply = const _Tp&;
	};
	template <>
	struct __apply_cv_mf<true, false, true> {
	template <class _Tp> using __apply = volatile _Tp&;
	};
	template <>
	struct __apply_cv_mf<true, true, true> {
	template <class _Tp> using __apply = const volatile _Tp&;
	};
	template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type>
	using __apply_cv_t = __apply_cv_mf<
	is_lvalue_reference<_Tp>::value,
	is_const<_RawTp>::value,
	is_volatile<_RawTp>::value>;

	// __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 _TupleIndices>
	struct __make_tuple_types_flat;

	template <template <class...> class _Tuple, class ..._Types, size_t ..._Idx>
	struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> {
	// Specialization for pair, tuple, and __tuple_types
	template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
	using __apply_quals = __tuple_types<
	typename _ApplyFn::template __apply<__type_pack_element<_Idx, _Types...>>...
	>;
	};

	template <class _Vt, size_t _Np, size_t ..._Idx>
	struct __make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_Idx...>> {
	template <size_t>
	using __value_type = _Vt;
	template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
	using __apply_quals = __tuple_types<
	typename _ApplyFn::template __apply<__value_type<_Idx>>...
	>;
	};

	template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value,
	size_t _Sp = 0,
	bool _SameSize = (_Ep == tuple_size<typename remove_reference<_Tp>::type>::value)>
	struct __make_tuple_types
	{
	static_assert(_Sp <= _Ep, "__make_tuple_types input error");
	using _RawTp = typename remove_cv<typename remove_reference<_Tp>::type>::type;
	using _Maker = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>;
	using type = typename _Maker::template __apply_quals<_Tp>;
	};

	template <class ..._Types, size_t _Ep>
	struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> {
	typedef __tuple_types<_Types...> type;
	};

	template <class ..._Types, size_t _Ep>
	struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> {
	typedef __tuple_types<_Types...> type;
	};

	template <bool ..._Preds>
	struct __all_dummy;

	template <bool ..._Pred>
	using __all = is_same<__all_dummy<_Pred...>, __all_dummy<(_Pred, true)...>>;

	struct __tuple_sfinae_base {
	template <template <class, class...> class _Trait,
	class ..._LArgs, class ..._RArgs>
	static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>)
	-> __all<typename enable_if<_Trait<_LArgs, _RArgs>::value, bool>::type{true}...>;
	template <template <class...> class>
	static auto __do_test(...) -> false_type;

	template <class _FromArgs, class _ToArgs>
	using __constructible = decltype(__do_test<is_constructible>(_ToArgs{}, _FromArgs{}));
	template <class _FromArgs, class _ToArgs>
	using __convertible = decltype(__do_test<is_convertible>(_FromArgs{}, _ToArgs{}));
	template <class _FromArgs, class _ToArgs>
	using __assignable = decltype(__do_test<is_assignable>(_ToArgs{}, _FromArgs{}));
	};

	// __tuple_convertible

	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_sfinae_base::__convertible<
	typename __make_tuple_types<_Tp>::type
	, typename __make_tuple_types<_Up>::type
	>
	{};

	// __tuple_constructible

	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_sfinae_base::__constructible<
	typename __make_tuple_types<_Tp>::type
	, typename __make_tuple_types<_Up>::type
	>
	{};

	// __tuple_assignable

	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_sfinae_base::__assignable<
	typename __make_tuple_types<_Tp>::type
	, typename __make_tuple_types<_Up&>::type
	>
	{};


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

	#if _LIBCPP_STD_VER > 11
	template <size_t _Ip, class ..._Tp>
	using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type;
	#endif

	#endif // _LIBCPP_HAS_NO_VARIADICS

	#ifndef _LIBCPP_CXX03_LANG
	template <bool _IsTuple, class _SizeTrait, size_t _Expected>
	struct __tuple_like_with_size_imp : false_type {};

	template <class _SizeTrait, size_t _Expected>
	struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected>
	: integral_constant<bool, _SizeTrait::value == _Expected> {};

	template <class _Tuple, size_t _ExpectedSize,
	class _RawTuple = typename __uncvref<_Tuple>::type>
	using __tuple_like_with_size = __tuple_like_with_size_imp<
	__tuple_like<_RawTuple>::value,
	tuple_size<_RawTuple>, _ExpectedSize
	>;

	struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
	template <class ...>
	static constexpr bool __enable_default() { return false; }
	template <class ...>
	static constexpr bool __enable_explicit() { return false; }
	template <class ...>
	static constexpr bool __enable_implicit() { return false; }
	template <class ...>
	static constexpr bool __enable_assign() { return false; }
	};
	#endif

	_LIBCPP_END_NAMESPACE_STD

	#endif // _LIBCPP___TUPLE