| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___TUPLE_SFINAE_HELPERS_H |
| #define _LIBCPP___TUPLE_SFINAE_HELPERS_H |
| |
| #include <__config> |
| #include <__fwd/tuple.h> |
| #include <__tuple_dir/make_tuple_types.h> |
| #include <__tuple_dir/tuple_element.h> |
| #include <__tuple_dir/tuple_like_ext.h> |
| #include <__tuple_dir/tuple_size.h> |
| #include <__tuple_dir/tuple_types.h> |
| #include <__type_traits/enable_if.h> |
| #include <__type_traits/integral_constant.h> |
| #include <__type_traits/is_assignable.h> |
| #include <__type_traits/is_constructible.h> |
| #include <__type_traits/is_convertible.h> |
| #include <__type_traits/is_same.h> |
| #include <__type_traits/remove_cvref.h> |
| #include <__type_traits/remove_reference.h> |
| #include <cstddef> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| |
| template <bool ..._Preds> |
| struct __all_dummy; |
| |
| template <bool ..._Pred> |
| struct __all : _IsSame<__all_dummy<_Pred...>, __all_dummy<((void)_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<__enable_if_t<_Trait<_LArgs, _RArgs>::value, bool>{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_ext<__libcpp_remove_reference_t<_Tp> >::value, |
| bool = __tuple_like_ext<_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_ext<__libcpp_remove_reference_t<_Tp> >::value, |
| bool = __tuple_like_ext<_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_ext<__libcpp_remove_reference_t<_Tp> >::value, |
| bool = __tuple_like_ext<_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> |
| struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> > |
| { |
| typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type; |
| }; |
| |
| 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 = __libcpp_remove_reference_t<_Tuple> > |
| using __tuple_like_with_size _LIBCPP_NODEBUG = __tuple_like_with_size_imp< |
| __tuple_like_ext<_RawTuple>::value, |
| tuple_size<_RawTuple>, _ExpectedSize |
| >; |
| |
| struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail { |
| |
| static constexpr bool __enable_explicit_default() { return false; } |
| static constexpr bool __enable_implicit_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_SFINAE_HELPERS_H |