8e706d2c3e
Summary:
There is no reason to guard `tuple_size`, `tuple_element` and `get<I>(...)` for pair and array inside of `<__tuple>` so that they are only available when we have variadic templates.
This requires there be redundant declarations and definitions. It also makes it easy to get things wrong.
For example the following code should compile (and does in c++11).
```
#define _LIBCPP_HAS_NO_VARIADICS
#include <array>
int main()
{
static_assert((std::tuple_size<std::array<int, 10> volatile>::value == 10), "");
}
```
This patch lifts the non-variadic parts of `tuple_size`, `tuple_types`, and `get<I>(...)` to the top of `<__tuple>` where they don't require variadic templates. This patch also removes `<__tuple_03>` because there is no longer a need for it.
Reviewers: danalbert, K-ballo, mclow.lists
Reviewed By: mclow.lists
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D7774
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@232492 91177308-0d34-0410-b5e6-96231b3b80d8
374 lines
12 KiB
C++
374 lines
12 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___TUPLE
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#define _LIBCPP___TUPLE
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#include <__config>
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#include <cstddef>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;
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template <class _Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_size<const _Tp>
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: public tuple_size<_Tp> {};
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template <class _Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_size<volatile _Tp>
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: public tuple_size<_Tp> {};
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template <class _Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_size<const volatile _Tp>
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: public tuple_size<_Tp> {};
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template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;
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template <size_t _Ip, class _Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const _Tp>
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{
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public:
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typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
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};
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template <size_t _Ip, class _Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, volatile _Tp>
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{
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public:
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typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
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};
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template <size_t _Ip, class _Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const volatile _Tp>
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{
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public:
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typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
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};
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template <class _Tp> struct __tuple_like : false_type {};
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template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
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template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
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template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};
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// tuple specializations
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#if !defined(_LIBCPP_HAS_NO_VARIADICS)
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template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;
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template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
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template <size_t _Ip, class ..._Tp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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typename tuple_element<_Ip, tuple<_Tp...> >::type&
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get(tuple<_Tp...>&) _NOEXCEPT;
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template <size_t _Ip, class ..._Tp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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const typename tuple_element<_Ip, tuple<_Tp...> >::type&
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get(const tuple<_Tp...>&) _NOEXCEPT;
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template <size_t _Ip, class ..._Tp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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typename tuple_element<_Ip, tuple<_Tp...> >::type&&
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get(tuple<_Tp...>&&) _NOEXCEPT;
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#endif
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// pair specializations
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template <class _T1, class _T2> struct _LIBCPP_TYPE_VIS_ONLY pair;
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template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
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template <size_t _Ip, class _T1, class _T2>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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typename tuple_element<_Ip, pair<_T1, _T2> >::type&
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get(pair<_T1, _T2>&) _NOEXCEPT;
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template <size_t _Ip, class _T1, class _T2>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
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get(const pair<_T1, _T2>&) _NOEXCEPT;
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#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
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template <size_t _Ip, class _T1, class _T2>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
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get(pair<_T1, _T2>&&) _NOEXCEPT;
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#endif
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// array specializations
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template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;
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template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
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template <size_t _Ip, class _Tp, size_t _Size>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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_Tp&
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get(array<_Tp, _Size>&) _NOEXCEPT;
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template <size_t _Ip, class _Tp, size_t _Size>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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const _Tp&
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get(const array<_Tp, _Size>&) _NOEXCEPT;
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#if !defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
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template <size_t _Ip, class _Tp, size_t _Size>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
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_Tp&&
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get(array<_Tp, _Size>&&) _NOEXCEPT;
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#endif
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#if !defined(_LIBCPP_HAS_NO_VARIADICS)
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// __lazy_and
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template <bool _Last, class ..._Preds>
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struct __lazy_and_impl;
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template <class ..._Preds>
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struct __lazy_and_impl<false, _Preds...> : false_type {};
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template <>
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struct __lazy_and_impl<true> : true_type {};
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template <class _Pred>
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struct __lazy_and_impl<true, _Pred> : integral_constant<bool, _Pred::type::value> {};
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template <class _Hp, class ..._Tp>
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struct __lazy_and_impl<true, _Hp, _Tp...> : __lazy_and_impl<_Hp::type::value, _Tp...> {};
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template <class _P1, class ..._Pr>
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struct __lazy_and : __lazy_and_impl<_P1::type::value, _Pr...> {};
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// __lazy_not
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template <class _Pred>
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struct __lazy_not : integral_constant<bool, !_Pred::type::value> {};
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// __make_tuple_indices
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template <size_t...> struct __tuple_indices {};
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template <size_t _Sp, class _IntTuple, size_t _Ep>
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struct __make_indices_imp;
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template <size_t _Sp, size_t ..._Indices, size_t _Ep>
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struct __make_indices_imp<_Sp, __tuple_indices<_Indices...>, _Ep>
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{
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typedef typename __make_indices_imp<_Sp+1, __tuple_indices<_Indices..., _Sp>, _Ep>::type type;
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};
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template <size_t _Ep, size_t ..._Indices>
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struct __make_indices_imp<_Ep, __tuple_indices<_Indices...>, _Ep>
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{
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typedef __tuple_indices<_Indices...> type;
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};
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template <size_t _Ep, size_t _Sp = 0>
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struct __make_tuple_indices
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{
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static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
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typedef typename __make_indices_imp<_Sp, __tuple_indices<>, _Ep>::type type;
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};
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// __tuple_types
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template <class ..._Tp> struct __tuple_types {};
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template <size_t _Ip>
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class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<> >
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{
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public:
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static_assert(_Ip == 0, "tuple_element index out of range");
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static_assert(_Ip != 0, "tuple_element index out of range");
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};
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template <class _Hp, class ..._Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, __tuple_types<_Hp, _Tp...> >
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{
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public:
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typedef _Hp type;
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};
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template <size_t _Ip, class _Hp, class ..._Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
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{
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public:
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typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
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};
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template <class ..._Tp>
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class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
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: public integral_constant<size_t, sizeof...(_Tp)>
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{
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};
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template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
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// __make_tuple_types
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// __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
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// __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
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// _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a
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// lvalue_reference type, then __tuple_types<_Types&...> is the result.
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template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
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struct __make_tuple_types_imp;
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template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
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struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
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{
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typedef typename remove_reference<_Tp>::type _Tpr;
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typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
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typename conditional<is_lvalue_reference<_Tp>::value,
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typename tuple_element<_Sp, _Tpr>::type&,
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typename tuple_element<_Sp, _Tpr>::type>::type>,
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_Tp, _Sp+1, _Ep>::type type;
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};
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template <class ..._Types, class _Tp, size_t _Ep>
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struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
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{
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typedef __tuple_types<_Types...> type;
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};
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template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
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struct __make_tuple_types
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{
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static_assert(_Sp <= _Ep, "__make_tuple_types input error");
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typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
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};
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// __tuple_convertible
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template <class, class>
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struct __tuple_convertible_imp : public false_type {};
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template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
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struct __tuple_convertible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
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: public integral_constant<bool,
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is_convertible<_Tp0, _Up0>::value &&
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__tuple_convertible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
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template <>
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struct __tuple_convertible_imp<__tuple_types<>, __tuple_types<> >
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: public true_type {};
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template <bool, class, class>
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struct __tuple_convertible_apply : public false_type {};
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template <class _Tp, class _Up>
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struct __tuple_convertible_apply<true, _Tp, _Up>
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: public __tuple_convertible_imp<
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typename __make_tuple_types<_Tp>::type
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, typename __make_tuple_types<_Up>::type
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>
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{};
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template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
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bool = __tuple_like<_Up>::value>
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struct __tuple_convertible
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: public false_type {};
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template <class _Tp, class _Up>
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struct __tuple_convertible<_Tp, _Up, true, true>
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: public __tuple_convertible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
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tuple_size<_Up>::value, _Tp, _Up>
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{};
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// __tuple_constructible
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template <class, class>
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struct __tuple_constructible_imp : public false_type {};
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template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
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struct __tuple_constructible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
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: public integral_constant<bool,
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is_constructible<_Up0, _Tp0>::value &&
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__tuple_constructible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
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template <>
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struct __tuple_constructible_imp<__tuple_types<>, __tuple_types<> >
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: public true_type {};
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template <bool _SameSize, class, class>
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struct __tuple_constructible_apply : public false_type {};
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template <class _Tp, class _Up>
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struct __tuple_constructible_apply<true, _Tp, _Up>
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: public __tuple_constructible_imp<
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typename __make_tuple_types<_Tp>::type
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, typename __make_tuple_types<_Up>::type
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>
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{};
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template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
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bool = __tuple_like<_Up>::value>
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struct __tuple_constructible
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: public false_type {};
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template <class _Tp, class _Up>
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struct __tuple_constructible<_Tp, _Up, true, true>
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: public __tuple_constructible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
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tuple_size<_Up>::value, _Tp, _Up>
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{};
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// __tuple_assignable
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template <class, class>
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struct __tuple_assignable_imp : public false_type {};
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template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
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struct __tuple_assignable_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
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: public integral_constant<bool,
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is_assignable<_Up0&, _Tp0>::value &&
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__tuple_assignable_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
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template <>
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struct __tuple_assignable_imp<__tuple_types<>, __tuple_types<> >
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: public true_type {};
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template <bool, class, class>
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struct __tuple_assignable_apply : public false_type {};
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template <class _Tp, class _Up>
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struct __tuple_assignable_apply<true, _Tp, _Up>
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: __tuple_assignable_imp<
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typename __make_tuple_types<_Tp>::type
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, typename __make_tuple_types<_Up>::type
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>
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{};
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template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
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bool = __tuple_like<_Up>::value>
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struct __tuple_assignable
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: public false_type {};
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template <class _Tp, class _Up>
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struct __tuple_assignable<_Tp, _Up, true, true>
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: public __tuple_assignable_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
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tuple_size<_Up>::value, _Tp, _Up>
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{};
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#endif // _LIBCPP_HAS_NO_VARIADICS
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___TUPLE
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