ce7771902d
This patch updates the includes guards of the C++ 03 headers. This is part of https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc.
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___CXX03___ALGORITHM_UNWRAP_RANGE_H
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#define _LIBCPP___CXX03___ALGORITHM_UNWRAP_RANGE_H
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#include <__cxx03/__algorithm/unwrap_iter.h>
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#include <__cxx03/__concepts/constructible.h>
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#include <__cxx03/__config>
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#include <__cxx03/__iterator/concepts.h>
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#include <__cxx03/__iterator/next.h>
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#include <__cxx03/__utility/declval.h>
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#include <__cxx03/__utility/move.h>
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#include <__cxx03/__utility/pair.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_PUSH_MACROS
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#include <__cxx03/__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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// __unwrap_range and __rewrap_range are used to unwrap ranges which may have different iterator and sentinel types.
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// __unwrap_iter and __rewrap_iter don't work for this, because they assume that the iterator and sentinel have
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// the same type. __unwrap_range tries to get two iterators and then forward to __unwrap_iter.
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#if _LIBCPP_STD_VER >= 20
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template <class _Iter, class _Sent>
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struct __unwrap_range_impl {
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_LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Sent __sent)
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requires random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>
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{
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auto __last = ranges::next(__first, __sent);
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return pair{std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last))};
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}
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_LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Sent __last) {
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return pair{std::move(__first), std::move(__last)};
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}
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_LIBCPP_HIDE_FROM_ABI static constexpr auto
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__rewrap(_Iter __orig_iter, decltype(std::__unwrap_iter(std::move(__orig_iter))) __iter)
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requires random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>
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{
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return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
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}
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_LIBCPP_HIDE_FROM_ABI static constexpr auto __rewrap(const _Iter&, _Iter __iter)
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requires(!(random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>))
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{
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return __iter;
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}
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};
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template <class _Iter>
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struct __unwrap_range_impl<_Iter, _Iter> {
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_LIBCPP_HIDE_FROM_ABI static constexpr auto __unwrap(_Iter __first, _Iter __last) {
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return pair{std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last))};
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}
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_LIBCPP_HIDE_FROM_ABI static constexpr auto
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__rewrap(_Iter __orig_iter, decltype(std::__unwrap_iter(__orig_iter)) __iter) {
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return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
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}
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};
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template <class _Iter, class _Sent>
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_LIBCPP_HIDE_FROM_ABI constexpr auto __unwrap_range(_Iter __first, _Sent __last) {
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return __unwrap_range_impl<_Iter, _Sent>::__unwrap(std::move(__first), std::move(__last));
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}
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template < class _Sent, class _Iter, class _Unwrapped>
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_LIBCPP_HIDE_FROM_ABI constexpr _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {
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return __unwrap_range_impl<_Iter, _Sent>::__rewrap(std::move(__orig_iter), std::move(__iter));
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}
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#else // _LIBCPP_STD_VER >= 20
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template <class _Iter, class _Unwrapped = decltype(std::__unwrap_iter(std::declval<_Iter>()))>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR pair<_Unwrapped, _Unwrapped> __unwrap_range(_Iter __first, _Iter __last) {
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return std::make_pair(std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last)));
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}
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template <class _Iter, class _Unwrapped>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Iter __rewrap_range(_Iter __orig_iter, _Unwrapped __iter) {
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return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
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}
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___CXX03___ALGORITHM_UNWRAP_RANGE_H
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