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183 lines
6.5 KiB
C++
183 lines
6.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___TUPLE_SFINAE_HELPERS_H
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#define _LIBCPP___TUPLE_SFINAE_HELPERS_H
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#include <__config>
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#include <__fwd/tuple.h>
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#include <__tuple/make_tuple_types.h>
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#include <__tuple/tuple_element.h>
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#include <__tuple/tuple_like_ext.h>
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#include <__tuple/tuple_size.h>
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#include <__tuple/tuple_types.h>
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#include <__type_traits/enable_if.h>
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#include <__type_traits/integral_constant.h>
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#include <__type_traits/is_assignable.h>
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#include <__type_traits/is_constructible.h>
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#include <__type_traits/is_convertible.h>
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#include <__type_traits/is_same.h>
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#include <__type_traits/remove_cvref.h>
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#include <__type_traits/remove_reference.h>
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#include <cstddef>
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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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#ifndef _LIBCPP_CXX03_LANG
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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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struct __all : _IsSame<__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<__enable_if_t<_Trait<_LArgs, _RArgs>::value, bool>{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_ext<__libcpp_remove_reference_t<_Tp> >::value,
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bool = __tuple_like_ext<_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
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>
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{};
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// __tuple_constructible
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template <class _Tp, class _Up, bool = __tuple_like_ext<__libcpp_remove_reference_t<_Tp> >::value,
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bool = __tuple_like_ext<_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_sfinae_base::__constructible<
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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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// __tuple_assignable
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template <class _Tp, class _Up, bool = __tuple_like_ext<__libcpp_remove_reference_t<_Tp> >::value,
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bool = __tuple_like_ext<_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_sfinae_base::__assignable<
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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 <size_t _Ip, class ..._Tp>
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struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> >
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{
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typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
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};
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struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
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static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_explicit_default() { return false; }
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static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_implicit_default() { return false; }
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template <class ...>
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static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_explicit() { return false; }
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template <class ...>
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static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_implicit() { return false; }
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template <class ...>
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static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_assign() { return false; }
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};
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#endif // !defined(_LIBCPP_CXX03_LANG)
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#if _LIBCPP_STD_VER >= 17
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template <bool _CanCopy, bool _CanMove>
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struct __sfinae_ctor_base {};
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template <>
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struct __sfinae_ctor_base<false, false> {
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__sfinae_ctor_base() = default;
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__sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
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__sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
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__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
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__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
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};
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template <>
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struct __sfinae_ctor_base<true, false> {
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__sfinae_ctor_base() = default;
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__sfinae_ctor_base(__sfinae_ctor_base const&) = default;
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__sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
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__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
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__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
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};
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template <>
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struct __sfinae_ctor_base<false, true> {
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__sfinae_ctor_base() = default;
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__sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
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__sfinae_ctor_base(__sfinae_ctor_base &&) = default;
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__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
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__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
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};
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template <bool _CanCopy, bool _CanMove>
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struct __sfinae_assign_base {};
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template <>
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struct __sfinae_assign_base<false, false> {
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__sfinae_assign_base() = default;
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__sfinae_assign_base(__sfinae_assign_base const&) = default;
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__sfinae_assign_base(__sfinae_assign_base &&) = default;
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__sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
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__sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
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};
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template <>
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struct __sfinae_assign_base<true, false> {
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__sfinae_assign_base() = default;
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__sfinae_assign_base(__sfinae_assign_base const&) = default;
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__sfinae_assign_base(__sfinae_assign_base &&) = default;
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__sfinae_assign_base& operator=(__sfinae_assign_base const&) = default;
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__sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
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};
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template <>
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struct __sfinae_assign_base<false, true> {
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__sfinae_assign_base() = default;
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__sfinae_assign_base(__sfinae_assign_base const&) = default;
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__sfinae_assign_base(__sfinae_assign_base &&) = default;
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__sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
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__sfinae_assign_base& operator=(__sfinae_assign_base&&) = default;
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};
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#endif // _LIBCPP_STD_VER >= 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___TUPLE_SFINAE_HELPERS_H
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