e78f53d1e8
This reverts commit 68c04b0ae62d8431d72d8b47fc13008002ee4387. This disables the IWYU mapping that caused the failure, since the headers aren't reachable for now. This is the first part of the "Freezing C++03 headers" proposal explained in https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319/58. This patch mechanically copies the headers as of the LLVM 19.1 release into a subdirectory of libc++ so that we can start using these headers when building in C++03 mode. We are going to be backporting important changes to that copy of the headers until the LLVM 21 release. After the LLVM 21 release, only critical bugfixes will be fixed in the C++03 copy of the headers. This patch only performs a copy of the headers -- these headers are still unused by the rest of the codebase.
84 lines
3.8 KiB
C++
84 lines
3.8 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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___FUNCTIONAL_BIND_BACK_H
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#define _LIBCPP___FUNCTIONAL_BIND_BACK_H
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#include <__config>
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#include <__functional/invoke.h>
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#include <__functional/perfect_forward.h>
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#include <__type_traits/decay.h>
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#include <__utility/forward.h>
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#include <__utility/integer_sequence.h>
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#include <tuple>
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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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#if _LIBCPP_STD_VER >= 20
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template <size_t _NBound, class = make_index_sequence<_NBound>>
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struct __bind_back_op;
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template <size_t _NBound, size_t... _Ip>
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struct __bind_back_op<_NBound, index_sequence<_Ip...>> {
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template <class _Fn, class _BoundArgs, class... _Args>
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_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Fn&& __f, _BoundArgs&& __bound_args, _Args&&... __args) const
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noexcept(noexcept(std::invoke(std::forward<_Fn>(__f),
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std::forward<_Args>(__args)...,
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std::get<_Ip>(std::forward<_BoundArgs>(__bound_args))...)))
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-> decltype(std::invoke(std::forward<_Fn>(__f),
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std::forward<_Args>(__args)...,
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std::get<_Ip>(std::forward<_BoundArgs>(__bound_args))...)) {
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return std::invoke(std::forward<_Fn>(__f),
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std::forward<_Args>(__args)...,
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std::get<_Ip>(std::forward<_BoundArgs>(__bound_args))...);
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}
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};
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template <class _Fn, class _BoundArgs>
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struct __bind_back_t : __perfect_forward<__bind_back_op<tuple_size_v<_BoundArgs>>, _Fn, _BoundArgs> {
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using __perfect_forward<__bind_back_op<tuple_size_v<_BoundArgs>>, _Fn, _BoundArgs>::__perfect_forward;
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};
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template <class _Fn, class... _Args>
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requires is_constructible_v<decay_t<_Fn>, _Fn> && is_move_constructible_v<decay_t<_Fn>> &&
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(is_constructible_v<decay_t<_Args>, _Args> && ...) && (is_move_constructible_v<decay_t<_Args>> && ...)
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_LIBCPP_HIDE_FROM_ABI constexpr auto __bind_back(_Fn&& __f, _Args&&... __args) noexcept(
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noexcept(__bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(
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std::forward<_Fn>(__f), std::forward_as_tuple(std::forward<_Args>(__args)...))))
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-> decltype(__bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(
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std::forward<_Fn>(__f), std::forward_as_tuple(std::forward<_Args>(__args)...))) {
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return __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(
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std::forward<_Fn>(__f), std::forward_as_tuple(std::forward<_Args>(__args)...));
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}
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# if _LIBCPP_STD_VER >= 23
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template <class _Fn, class... _Args>
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_LIBCPP_HIDE_FROM_ABI constexpr auto bind_back(_Fn&& __f, _Args&&... __args) {
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static_assert(is_constructible_v<decay_t<_Fn>, _Fn>, "bind_back requires decay_t<F> to be constructible from F");
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static_assert(is_move_constructible_v<decay_t<_Fn>>, "bind_back requires decay_t<F> to be move constructible");
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static_assert((is_constructible_v<decay_t<_Args>, _Args> && ...),
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"bind_back requires all decay_t<Args> to be constructible from respective Args");
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static_assert((is_move_constructible_v<decay_t<_Args>> && ...),
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"bind_back requires all decay_t<Args> to be move constructible");
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return __bind_back_t<decay_t<_Fn>, tuple<decay_t<_Args>...>>(
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std::forward<_Fn>(__f), std::forward_as_tuple(std::forward<_Args>(__args)...));
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}
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# endif // _LIBCPP_STD_VER >= 23
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FUNCTIONAL_BIND_BACK_H
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