e78f53d1e8
This reverts commit 68c04b0ae6.
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.
96 lines
3.4 KiB
C++
96 lines
3.4 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___ALGORITHM_RANGES_MIN_H
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#define _LIBCPP___ALGORITHM_RANGES_MIN_H
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#include <__algorithm/ranges_min_element.h>
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#include <__assert>
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#include <__concepts/copyable.h>
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#include <__config>
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#include <__functional/identity.h>
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#include <__functional/invoke.h>
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#include <__functional/ranges_operations.h>
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#include <__iterator/concepts.h>
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#include <__iterator/projected.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__type_traits/is_trivially_copyable.h>
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#include <initializer_list>
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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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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_PUSH_MACROS
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# include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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namespace __min {
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struct __fn {
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template <class _Tp,
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class _Proj = identity,
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indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr const _Tp&
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operator()(_LIBCPP_LIFETIMEBOUND const _Tp& __a,
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_LIBCPP_LIFETIMEBOUND const _Tp& __b,
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_Comp __comp = {},
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_Proj __proj = {}) const {
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return std::invoke(__comp, std::invoke(__proj, __b), std::invoke(__proj, __a)) ? __b : __a;
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}
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template <copyable _Tp,
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class _Proj = identity,
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indirect_strict_weak_order<projected<const _Tp*, _Proj>> _Comp = ranges::less>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Tp
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operator()(initializer_list<_Tp> __il, _Comp __comp = {}, _Proj __proj = {}) const {
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
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__il.begin() != __il.end(), "initializer_list must contain at least one element");
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return *ranges::__min_element_impl(__il.begin(), __il.end(), __comp, __proj);
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}
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template <input_range _Rp,
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class _Proj = identity,
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indirect_strict_weak_order<projected<iterator_t<_Rp>, _Proj>> _Comp = ranges::less>
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requires indirectly_copyable_storable<iterator_t<_Rp>, range_value_t<_Rp>*>
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr range_value_t<_Rp>
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operator()(_Rp&& __r, _Comp __comp = {}, _Proj __proj = {}) const {
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auto __first = ranges::begin(__r);
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auto __last = ranges::end(__r);
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_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(__first != __last, "range must contain at least one element");
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if constexpr (forward_range<_Rp> && !__is_cheap_to_copy<range_value_t<_Rp>>) {
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return *ranges::__min_element_impl(__first, __last, __comp, __proj);
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} else {
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range_value_t<_Rp> __result = *__first;
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while (++__first != __last) {
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if (std::invoke(__comp, std::invoke(__proj, *__first), std::invoke(__proj, __result)))
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__result = *__first;
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}
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return __result;
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}
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}
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};
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} // namespace __min
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inline namespace __cpo {
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inline constexpr auto min = __min::__fn{};
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} // namespace __cpo
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} // namespace ranges
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP_STD_VER >= 20
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#endif // _LIBCPP___ALGORITHM_RANGES_MIN_H
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