091c33b1f5
The SFINAE isn't required, since the primary `tuple` class already does the SFINAE checks. This removes a bit of code that was only used for these constraints. This also moves the `tuple_element` specialization for `tuple` to `__fwd/tuple.h` to avoid a dependency on `__tuple/sfinae_helpers.h` (which should be moved in a follow-up).
100 lines
3.9 KiB
C++
100 lines
3.9 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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#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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struct _LIBCPP_EXPORTED_FROM_ABI __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() {
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return false;
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}
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template <class...>
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static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_implicit() {
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return false;
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}
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template <class...>
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static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_assign() {
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return false;
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}
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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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