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156ab87500
See: * https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319 * https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701 We're dropping support for C++03 for Zig due to the first change; it would be insane to ship 1018 duplicate header files just for this outdated use case. As a result of the second change, I had to bring in a subset of the headers from llvm-libc since libc++ now depends on these. Hopefully we can continue to get away with not copying the entirety of llvm-libc.
61 lines
2.1 KiB
C++
Vendored
61 lines
2.1 KiB
C++
Vendored
// -*- 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___ITERATOR_PROJECTED_H
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#define _LIBCPP___ITERATOR_PROJECTED_H
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/incrementable_traits.h> // iter_difference_t
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#include <__type_traits/remove_cvref.h>
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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 <class _It, class _Proj>
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struct __projected_impl {
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struct __type {
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using __primary_template _LIBCPP_NODEBUG = __type;
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using __projected_iterator _LIBCPP_NODEBUG = _It;
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using __projected_projection _LIBCPP_NODEBUG = _Proj;
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using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>;
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indirect_result_t<_Proj&, _It> operator*() const; // not defined
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};
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};
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template <weakly_incrementable _It, class _Proj>
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struct __projected_impl<_It, _Proj> {
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struct __type {
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using __primary_template _LIBCPP_NODEBUG = __type;
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using __projected_iterator _LIBCPP_NODEBUG = _It;
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using __projected_projection _LIBCPP_NODEBUG = _Proj;
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using value_type = remove_cvref_t<indirect_result_t<_Proj&, _It>>;
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using difference_type = iter_difference_t<_It>;
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indirect_result_t<_Proj&, _It> operator*() const; // not defined
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};
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};
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// Note that we implement std::projected in a way that satisfies P2538R1 even in standard
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// modes before C++26 to avoid breaking the ABI between standard modes (even though ABI
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// breaks with std::projected are expected to have essentially no impact).
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template <indirectly_readable _It, indirectly_regular_unary_invocable<_It> _Proj>
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using projected = typename __projected_impl<_It, _Proj>::__type;
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___ITERATOR_PROJECTED_H
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