106c3fb27SDimitry Andric //===----------------------------------------------------------------------===// 206c3fb27SDimitry Andric // 306c3fb27SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 406c3fb27SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 506c3fb27SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 606c3fb27SDimitry Andric // 706c3fb27SDimitry Andric //===----------------------------------------------------------------------===// 806c3fb27SDimitry Andric 906c3fb27SDimitry Andric #ifndef _LIBCPP___TUPLE_SFINAE_HELPERS_H 1006c3fb27SDimitry Andric #define _LIBCPP___TUPLE_SFINAE_HELPERS_H 1106c3fb27SDimitry Andric 1206c3fb27SDimitry Andric #include <__config> 1306c3fb27SDimitry Andric #include <__fwd/tuple.h> 1406c3fb27SDimitry Andric #include <__tuple/make_tuple_types.h> 1506c3fb27SDimitry Andric #include <__tuple/tuple_element.h> 1606c3fb27SDimitry Andric #include <__tuple/tuple_like_ext.h> 1706c3fb27SDimitry Andric #include <__tuple/tuple_size.h> 1806c3fb27SDimitry Andric #include <__tuple/tuple_types.h> 1906c3fb27SDimitry Andric #include <__type_traits/enable_if.h> 2006c3fb27SDimitry Andric #include <__type_traits/integral_constant.h> 2106c3fb27SDimitry Andric #include <__type_traits/is_assignable.h> 2206c3fb27SDimitry Andric #include <__type_traits/is_constructible.h> 2306c3fb27SDimitry Andric #include <__type_traits/is_convertible.h> 2406c3fb27SDimitry Andric #include <__type_traits/is_same.h> 2506c3fb27SDimitry Andric #include <__type_traits/remove_cvref.h> 2606c3fb27SDimitry Andric #include <__type_traits/remove_reference.h> 2706c3fb27SDimitry Andric #include <cstddef> 2806c3fb27SDimitry Andric 2906c3fb27SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 3006c3fb27SDimitry Andric # pragma GCC system_header 3106c3fb27SDimitry Andric #endif 3206c3fb27SDimitry Andric 3306c3fb27SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 3406c3fb27SDimitry Andric 3506c3fb27SDimitry Andric #ifndef _LIBCPP_CXX03_LANG 3606c3fb27SDimitry Andric 3706c3fb27SDimitry Andric template <bool... _Preds> 3806c3fb27SDimitry Andric struct __all_dummy; 3906c3fb27SDimitry Andric 4006c3fb27SDimitry Andric template <bool... _Pred> 4106c3fb27SDimitry Andric struct __all : _IsSame<__all_dummy<_Pred...>, __all_dummy<((void)_Pred, true)...>> {}; 4206c3fb27SDimitry Andric 4306c3fb27SDimitry Andric struct __tuple_sfinae_base { 44*cb14a3feSDimitry Andric template <template <class, class...> class _Trait, class... _LArgs, class... _RArgs> 4506c3fb27SDimitry Andric static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>) 4606c3fb27SDimitry Andric -> __all<__enable_if_t<_Trait<_LArgs, _RArgs>::value, bool>{true}...>; 4706c3fb27SDimitry Andric template <template <class...> class> 4806c3fb27SDimitry Andric static auto __do_test(...) -> false_type; 4906c3fb27SDimitry Andric 5006c3fb27SDimitry Andric template <class _FromArgs, class _ToArgs> 5106c3fb27SDimitry Andric using __constructible = decltype(__do_test<is_constructible>(_ToArgs{}, _FromArgs{})); 5206c3fb27SDimitry Andric template <class _FromArgs, class _ToArgs> 5306c3fb27SDimitry Andric using __convertible = decltype(__do_test<is_convertible>(_FromArgs{}, _ToArgs{})); 5406c3fb27SDimitry Andric template <class _FromArgs, class _ToArgs> 5506c3fb27SDimitry Andric using __assignable = decltype(__do_test<is_assignable>(_ToArgs{}, _FromArgs{})); 5606c3fb27SDimitry Andric }; 5706c3fb27SDimitry Andric 5806c3fb27SDimitry Andric // __tuple_convertible 5906c3fb27SDimitry Andric 60*cb14a3feSDimitry Andric template <class _Tp, 61*cb14a3feSDimitry Andric class _Up, 62*cb14a3feSDimitry Andric bool = __tuple_like_ext<__libcpp_remove_reference_t<_Tp> >::value, 6306c3fb27SDimitry Andric bool = __tuple_like_ext<_Up>::value> 64*cb14a3feSDimitry Andric struct __tuple_convertible : public false_type {}; 6506c3fb27SDimitry Andric 6606c3fb27SDimitry Andric template <class _Tp, class _Up> 6706c3fb27SDimitry Andric struct __tuple_convertible<_Tp, _Up, true, true> 68*cb14a3feSDimitry Andric : public __tuple_sfinae_base::__convertible< typename __make_tuple_types<_Tp>::type, 69*cb14a3feSDimitry Andric typename __make_tuple_types<_Up>::type > {}; 7006c3fb27SDimitry Andric 7106c3fb27SDimitry Andric // __tuple_constructible 7206c3fb27SDimitry Andric 73*cb14a3feSDimitry Andric template <class _Tp, 74*cb14a3feSDimitry Andric class _Up, 75*cb14a3feSDimitry Andric bool = __tuple_like_ext<__libcpp_remove_reference_t<_Tp> >::value, 7606c3fb27SDimitry Andric bool = __tuple_like_ext<_Up>::value> 77*cb14a3feSDimitry Andric struct __tuple_constructible : public false_type {}; 7806c3fb27SDimitry Andric 7906c3fb27SDimitry Andric template <class _Tp, class _Up> 8006c3fb27SDimitry Andric struct __tuple_constructible<_Tp, _Up, true, true> 81*cb14a3feSDimitry Andric : public __tuple_sfinae_base::__constructible< typename __make_tuple_types<_Tp>::type, 82*cb14a3feSDimitry Andric typename __make_tuple_types<_Up>::type > {}; 8306c3fb27SDimitry Andric 8406c3fb27SDimitry Andric // __tuple_assignable 8506c3fb27SDimitry Andric 86*cb14a3feSDimitry Andric template <class _Tp, 87*cb14a3feSDimitry Andric class _Up, 88*cb14a3feSDimitry Andric bool = __tuple_like_ext<__libcpp_remove_reference_t<_Tp> >::value, 8906c3fb27SDimitry Andric bool = __tuple_like_ext<_Up>::value> 90*cb14a3feSDimitry Andric struct __tuple_assignable : public false_type {}; 9106c3fb27SDimitry Andric 9206c3fb27SDimitry Andric template <class _Tp, class _Up> 9306c3fb27SDimitry Andric struct __tuple_assignable<_Tp, _Up, true, true> 94*cb14a3feSDimitry Andric : public __tuple_sfinae_base::__assignable< typename __make_tuple_types<_Tp>::type, 95*cb14a3feSDimitry Andric typename __make_tuple_types<_Up&>::type > {}; 9606c3fb27SDimitry Andric 9706c3fb27SDimitry Andric template <size_t _Ip, class... _Tp> 98*cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> > { 9906c3fb27SDimitry Andric typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type; 10006c3fb27SDimitry Andric }; 10106c3fb27SDimitry Andric 10206c3fb27SDimitry Andric struct _LIBCPP_EXPORTED_FROM_ABI __check_tuple_constructor_fail { 10306c3fb27SDimitry Andric static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_explicit_default() { return false; } 10406c3fb27SDimitry Andric static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_implicit_default() { return false; } 10506c3fb27SDimitry Andric template <class...> 106*cb14a3feSDimitry Andric static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_explicit() { 107*cb14a3feSDimitry Andric return false; 108*cb14a3feSDimitry Andric } 10906c3fb27SDimitry Andric template <class...> 110*cb14a3feSDimitry Andric static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_implicit() { 111*cb14a3feSDimitry Andric return false; 112*cb14a3feSDimitry Andric } 11306c3fb27SDimitry Andric template <class...> 114*cb14a3feSDimitry Andric static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_assign() { 115*cb14a3feSDimitry Andric return false; 116*cb14a3feSDimitry Andric } 11706c3fb27SDimitry Andric }; 11806c3fb27SDimitry Andric #endif // !defined(_LIBCPP_CXX03_LANG) 11906c3fb27SDimitry Andric 12006c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 17 12106c3fb27SDimitry Andric 12206c3fb27SDimitry Andric template <bool _CanCopy, bool _CanMove> 12306c3fb27SDimitry Andric struct __sfinae_ctor_base {}; 12406c3fb27SDimitry Andric template <> 12506c3fb27SDimitry Andric struct __sfinae_ctor_base<false, false> { 12606c3fb27SDimitry Andric __sfinae_ctor_base() = default; 12706c3fb27SDimitry Andric __sfinae_ctor_base(__sfinae_ctor_base const&) = delete; 12806c3fb27SDimitry Andric __sfinae_ctor_base(__sfinae_ctor_base&&) = delete; 12906c3fb27SDimitry Andric __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 13006c3fb27SDimitry Andric __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 13106c3fb27SDimitry Andric }; 13206c3fb27SDimitry Andric template <> 13306c3fb27SDimitry Andric struct __sfinae_ctor_base<true, false> { 13406c3fb27SDimitry Andric __sfinae_ctor_base() = default; 13506c3fb27SDimitry Andric __sfinae_ctor_base(__sfinae_ctor_base const&) = default; 13606c3fb27SDimitry Andric __sfinae_ctor_base(__sfinae_ctor_base&&) = delete; 13706c3fb27SDimitry Andric __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 13806c3fb27SDimitry Andric __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 13906c3fb27SDimitry Andric }; 14006c3fb27SDimitry Andric template <> 14106c3fb27SDimitry Andric struct __sfinae_ctor_base<false, true> { 14206c3fb27SDimitry Andric __sfinae_ctor_base() = default; 14306c3fb27SDimitry Andric __sfinae_ctor_base(__sfinae_ctor_base const&) = delete; 14406c3fb27SDimitry Andric __sfinae_ctor_base(__sfinae_ctor_base&&) = default; 14506c3fb27SDimitry Andric __sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default; 14606c3fb27SDimitry Andric __sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default; 14706c3fb27SDimitry Andric }; 14806c3fb27SDimitry Andric 14906c3fb27SDimitry Andric template <bool _CanCopy, bool _CanMove> 15006c3fb27SDimitry Andric struct __sfinae_assign_base {}; 15106c3fb27SDimitry Andric template <> 15206c3fb27SDimitry Andric struct __sfinae_assign_base<false, false> { 15306c3fb27SDimitry Andric __sfinae_assign_base() = default; 15406c3fb27SDimitry Andric __sfinae_assign_base(__sfinae_assign_base const&) = default; 15506c3fb27SDimitry Andric __sfinae_assign_base(__sfinae_assign_base&&) = default; 15606c3fb27SDimitry Andric __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete; 15706c3fb27SDimitry Andric __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete; 15806c3fb27SDimitry Andric }; 15906c3fb27SDimitry Andric template <> 16006c3fb27SDimitry Andric struct __sfinae_assign_base<true, false> { 16106c3fb27SDimitry Andric __sfinae_assign_base() = default; 16206c3fb27SDimitry Andric __sfinae_assign_base(__sfinae_assign_base const&) = default; 16306c3fb27SDimitry Andric __sfinae_assign_base(__sfinae_assign_base&&) = default; 16406c3fb27SDimitry Andric __sfinae_assign_base& operator=(__sfinae_assign_base const&) = default; 16506c3fb27SDimitry Andric __sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete; 16606c3fb27SDimitry Andric }; 16706c3fb27SDimitry Andric template <> 16806c3fb27SDimitry Andric struct __sfinae_assign_base<false, true> { 16906c3fb27SDimitry Andric __sfinae_assign_base() = default; 17006c3fb27SDimitry Andric __sfinae_assign_base(__sfinae_assign_base const&) = default; 17106c3fb27SDimitry Andric __sfinae_assign_base(__sfinae_assign_base&&) = default; 17206c3fb27SDimitry Andric __sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete; 17306c3fb27SDimitry Andric __sfinae_assign_base& operator=(__sfinae_assign_base&&) = default; 17406c3fb27SDimitry Andric }; 17506c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 17 17606c3fb27SDimitry Andric 17706c3fb27SDimitry Andric _LIBCPP_END_NAMESPACE_STD 17806c3fb27SDimitry Andric 17906c3fb27SDimitry Andric #endif // _LIBCPP___TUPLE_SFINAE_HELPERS_H 180