forked from OSchip/llvm-project
557 lines
20 KiB
C++
557 lines
20 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_TEMPLATE_VIS tuple_size;
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#if !defined(_LIBCPP_CXX03_LANG)
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template <class _Tp, class...>
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using __enable_if_tuple_size_imp = _Tp;
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template <class _Tp>
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class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
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const _Tp,
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typename enable_if<!is_volatile<_Tp>::value>::type,
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integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
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: public integral_constant<size_t, tuple_size<_Tp>::value> {};
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template <class _Tp>
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class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
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volatile _Tp,
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typename enable_if<!is_const<_Tp>::value>::type,
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integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
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: public integral_constant<size_t, tuple_size<_Tp>::value> {};
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template <class _Tp>
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class _LIBCPP_TEMPLATE_VIS tuple_size<__enable_if_tuple_size_imp<
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const volatile _Tp,
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integral_constant<size_t, sizeof(tuple_size<_Tp>)>>>
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: public integral_constant<size_t, tuple_size<_Tp>::value> {};
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#else
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template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<const _Tp> : public tuple_size<_Tp> {};
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template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<volatile _Tp> : public tuple_size<_Tp> {};
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template <class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_size<const volatile _Tp> : public tuple_size<_Tp> {};
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#endif
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template <size_t _Ip, class _Tp> class _LIBCPP_TEMPLATE_VIS tuple_element;
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template <size_t _Ip, class _Tp>
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class _LIBCPP_TEMPLATE_VIS 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_TEMPLATE_VIS 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_TEMPLATE_VIS 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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#ifndef _LIBCPP_CXX03_LANG
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template <size_t...> struct __tuple_indices {};
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template <class _IdxType, _IdxType... _Values>
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struct __integer_sequence {
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template <template <class _OIdxType, _OIdxType...> class _ToIndexSeq, class _ToIndexType>
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using __convert = _ToIndexSeq<_ToIndexType, _Values...>;
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template <size_t _Sp>
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using __to_tuple_indices = __tuple_indices<(_Values + _Sp)...>;
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};
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#if !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
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namespace __detail {
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template<typename _Tp, size_t ..._Extra> struct __repeat;
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template<typename _Tp, _Tp ..._Np, size_t ..._Extra> struct __repeat<__integer_sequence<_Tp, _Np...>, _Extra...> {
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typedef __integer_sequence<_Tp,
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_Np...,
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sizeof...(_Np) + _Np...,
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2 * sizeof...(_Np) + _Np...,
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3 * sizeof...(_Np) + _Np...,
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4 * sizeof...(_Np) + _Np...,
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5 * sizeof...(_Np) + _Np...,
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6 * sizeof...(_Np) + _Np...,
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7 * sizeof...(_Np) + _Np...,
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_Extra...> type;
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};
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template<size_t _Np> struct __parity;
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template<size_t _Np> struct __make : __parity<_Np % 8>::template __pmake<_Np> {};
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template<> struct __make<0> { typedef __integer_sequence<size_t> type; };
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template<> struct __make<1> { typedef __integer_sequence<size_t, 0> type; };
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template<> struct __make<2> { typedef __integer_sequence<size_t, 0, 1> type; };
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template<> struct __make<3> { typedef __integer_sequence<size_t, 0, 1, 2> type; };
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template<> struct __make<4> { typedef __integer_sequence<size_t, 0, 1, 2, 3> type; };
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template<> struct __make<5> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4> type; };
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template<> struct __make<6> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5> type; };
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template<> struct __make<7> { typedef __integer_sequence<size_t, 0, 1, 2, 3, 4, 5, 6> type; };
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template<> struct __parity<0> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type> {}; };
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template<> struct __parity<1> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 1> {}; };
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template<> struct __parity<2> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 2, _Np - 1> {}; };
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template<> struct __parity<3> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 3, _Np - 2, _Np - 1> {}; };
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template<> struct __parity<4> { template<size_t _Np> struct __pmake : __repeat<typename __make<_Np / 8>::type, _Np - 4, _Np - 3, _Np - 2, _Np - 1> {}; };
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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> {}; };
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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> {}; };
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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> {}; };
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} // namespace detail
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#endif // !__has_builtin(__make_integer_seq) || defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
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#if __has_builtin(__make_integer_seq)
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template <size_t _Ep, size_t _Sp>
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using __make_indices_imp =
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typename __make_integer_seq<__integer_sequence, size_t, _Ep - _Sp>::template
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__to_tuple_indices<_Sp>;
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#else
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template <size_t _Ep, size_t _Sp>
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using __make_indices_imp =
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typename __detail::__make<_Ep - _Sp>::type::template __to_tuple_indices<_Sp>;
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#endif
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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 __make_indices_imp<_Ep, _Sp> type;
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};
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template <class ..._Tp> class _LIBCPP_TEMPLATE_VIS tuple;
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template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
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template <class ..._Tp>
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class _LIBCPP_TEMPLATE_VIS tuple_size<tuple<_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 <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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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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#endif // !defined(_LIBCPP_CXX03_LANG)
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// pair specializations
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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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#ifndef _LIBCPP_CXX03_LANG
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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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#endif
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// array specializations
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template <class _Tp, size_t _Size> struct _LIBCPP_TEMPLATE_VIS 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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#ifndef _LIBCPP_CXX03_LANG
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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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#endif
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#ifndef _LIBCPP_CXX03_LANG
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// __tuple_types
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template <class ..._Tp> struct __tuple_types {};
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#if !__has_builtin(__type_pack_element)
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namespace __indexer_detail {
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template <size_t _Idx, class _Tp>
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struct __indexed { using type = _Tp; };
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template <class _Types, class _Indexes> struct __indexer;
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template <class ..._Types, size_t ..._Idx>
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struct __indexer<__tuple_types<_Types...>, __tuple_indices<_Idx...>>
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: __indexed<_Idx, _Types>...
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{};
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template <size_t _Idx, class _Tp>
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__indexed<_Idx, _Tp> __at_index(__indexed<_Idx, _Tp> const&);
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} // namespace __indexer_detail
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template <size_t _Idx, class ..._Types>
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using __type_pack_element = typename decltype(
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__indexer_detail::__at_index<_Idx>(
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__indexer_detail::__indexer<
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__tuple_types<_Types...>,
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typename __make_tuple_indices<sizeof...(_Types)>::type
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>{})
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)::type;
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#endif
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template <size_t _Ip, class ..._Types>
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class _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, __tuple_types<_Types...>>
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{
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public:
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static_assert(_Ip < sizeof...(_Types), "tuple_element index out of range");
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typedef __type_pack_element<_Ip, _Types...> type;
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};
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template <class ..._Tp>
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class _LIBCPP_TEMPLATE_VIS 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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template <bool _ApplyLV, bool _ApplyConst, bool _ApplyVolatile>
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struct __apply_cv_mf;
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template <>
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struct __apply_cv_mf<false, false, false> {
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template <class _Tp> using __apply = _Tp;
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};
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template <>
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struct __apply_cv_mf<false, true, false> {
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template <class _Tp> using __apply = const _Tp;
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};
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template <>
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struct __apply_cv_mf<false, false, true> {
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template <class _Tp> using __apply = volatile _Tp;
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};
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template <>
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struct __apply_cv_mf<false, true, true> {
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template <class _Tp> using __apply = const volatile _Tp;
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};
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template <>
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struct __apply_cv_mf<true, false, false> {
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template <class _Tp> using __apply = _Tp&;
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};
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template <>
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struct __apply_cv_mf<true, true, false> {
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template <class _Tp> using __apply = const _Tp&;
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};
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template <>
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struct __apply_cv_mf<true, false, true> {
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template <class _Tp> using __apply = volatile _Tp&;
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};
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template <>
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struct __apply_cv_mf<true, true, true> {
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template <class _Tp> using __apply = const volatile _Tp&;
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};
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template <class _Tp, class _RawTp = typename remove_reference<_Tp>::type>
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using __apply_cv_t = __apply_cv_mf<
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is_lvalue_reference<_Tp>::value,
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is_const<_RawTp>::value,
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is_volatile<_RawTp>::value>;
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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 _TupleIndices>
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struct __make_tuple_types_flat;
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template <template <class...> class _Tuple, class ..._Types, size_t ..._Idx>
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struct __make_tuple_types_flat<_Tuple<_Types...>, __tuple_indices<_Idx...>> {
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// Specialization for pair, tuple, and __tuple_types
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template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
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using __apply_quals = __tuple_types<
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typename _ApplyFn::template __apply<__type_pack_element<_Idx, _Types...>>...
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>;
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};
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template <class _Vt, size_t _Np, size_t ..._Idx>
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struct __make_tuple_types_flat<array<_Vt, _Np>, __tuple_indices<_Idx...>> {
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template <size_t>
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using __value_type = _Vt;
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template <class _Tp, class _ApplyFn = __apply_cv_t<_Tp>>
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using __apply_quals = __tuple_types<
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typename _ApplyFn::template __apply<__value_type<_Idx>>...
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>;
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};
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template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value,
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size_t _Sp = 0,
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bool _SameSize = (_Ep == tuple_size<typename remove_reference<_Tp>::type>::value)>
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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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using _RawTp = typename remove_cv<typename remove_reference<_Tp>::type>::type;
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using _Maker = __make_tuple_types_flat<_RawTp, typename __make_tuple_indices<_Ep, _Sp>::type>;
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using type = typename _Maker::template __apply_quals<_Tp>;
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};
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template <class ..._Types, size_t _Ep>
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struct __make_tuple_types<tuple<_Types...>, _Ep, 0, true> {
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typedef __tuple_types<_Types...> type;
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};
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template <class ..._Types, size_t _Ep>
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struct __make_tuple_types<__tuple_types<_Types...>, _Ep, 0, true> {
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typedef __tuple_types<_Types...> type;
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};
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template <bool ..._Preds>
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struct __all_dummy;
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template <bool ..._Pred>
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using __all = is_same<__all_dummy<_Pred...>, __all_dummy<((void)_Pred, true)...>>;
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struct __tuple_sfinae_base {
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template <template <class, class...> class _Trait,
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class ..._LArgs, class ..._RArgs>
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static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>)
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-> __all<typename enable_if<_Trait<_LArgs, _RArgs>::value, bool>::type{true}...>;
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template <template <class...> class>
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static auto __do_test(...) -> false_type;
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template <class _FromArgs, class _ToArgs>
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using __constructible = decltype(__do_test<is_constructible>(_ToArgs{}, _FromArgs{}));
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template <class _FromArgs, class _ToArgs>
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using __convertible = decltype(__do_test<is_convertible>(_FromArgs{}, _ToArgs{}));
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template <class _FromArgs, class _ToArgs>
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using __assignable = decltype(__do_test<is_assignable>(_ToArgs{}, _FromArgs{}));
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};
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// __tuple_convertible
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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_sfinae_base::__convertible<
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typename __make_tuple_types<_Tp>::type
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|
, 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_TEMPLATE_VIS 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
|
|
|
|
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 // !defined(_LIBCPP_CXX03_LANG)
|
|
|
|
#if _LIBCPP_STD_VER > 14
|
|
|
|
template <bool _CanCopy, bool _CanMove>
|
|
struct __sfinae_ctor_base {};
|
|
template <>
|
|
struct __sfinae_ctor_base<false, false> {
|
|
__sfinae_ctor_base() = default;
|
|
__sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
|
|
__sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
|
|
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
|
|
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
|
|
};
|
|
template <>
|
|
struct __sfinae_ctor_base<true, false> {
|
|
__sfinae_ctor_base() = default;
|
|
__sfinae_ctor_base(__sfinae_ctor_base const&) = default;
|
|
__sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
|
|
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
|
|
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
|
|
};
|
|
template <>
|
|
struct __sfinae_ctor_base<false, true> {
|
|
__sfinae_ctor_base() = default;
|
|
__sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
|
|
__sfinae_ctor_base(__sfinae_ctor_base &&) = default;
|
|
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
|
|
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
|
|
};
|
|
|
|
template <bool _CanCopy, bool _CanMove>
|
|
struct __sfinae_assign_base {};
|
|
template <>
|
|
struct __sfinae_assign_base<false, false> {
|
|
__sfinae_assign_base() = default;
|
|
__sfinae_assign_base(__sfinae_assign_base const&) = default;
|
|
__sfinae_assign_base(__sfinae_assign_base &&) = default;
|
|
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
|
|
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
|
|
};
|
|
template <>
|
|
struct __sfinae_assign_base<true, false> {
|
|
__sfinae_assign_base() = default;
|
|
__sfinae_assign_base(__sfinae_assign_base const&) = default;
|
|
__sfinae_assign_base(__sfinae_assign_base &&) = default;
|
|
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = default;
|
|
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
|
|
};
|
|
template <>
|
|
struct __sfinae_assign_base<false, true> {
|
|
__sfinae_assign_base() = default;
|
|
__sfinae_assign_base(__sfinae_assign_base const&) = default;
|
|
__sfinae_assign_base(__sfinae_assign_base &&) = default;
|
|
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
|
|
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = default;
|
|
};
|
|
#endif // _LIBCPP_STD_VER > 14
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
#endif // _LIBCPP___TUPLE
|