39dba7b354
3a653afd45 removed the inclusion of
`<__utility/declval.h>` from `<__algorithm/unwrap_range.h>`. However,
`unwrap_range.h` still needs to use `std::declval`. So we should restore
the inclusion.
The building failure with Clang modules was already caught by CI.
71 lines
2.8 KiB
C++
71 lines
2.8 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_UNWRAP_RANGE_H
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#define _LIBCPP___ALGORITHM_UNWRAP_RANGE_H
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#include <__algorithm/unwrap_iter.h>
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__type_traits/is_same.h>
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#include <__utility/declval.h>
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#include <__utility/move.h>
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#include <__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 <__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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_LIBCPP_HIDE_FROM_ABI constexpr auto __unwrap_range(_Iter __first, _Sent __last) {
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if constexpr (is_same_v<_Iter, _Sent>)
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return pair{std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__last))};
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else if constexpr (random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>) {
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auto __iter_last = __first + (__last - __first);
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return pair{std::__unwrap_iter(std::move(__first)), std::__unwrap_iter(std::move(__iter_last))};
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} else
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return pair{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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if constexpr (is_same_v<_Iter, _Sent>)
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return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
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else if constexpr (random_access_iterator<_Iter> && sized_sentinel_for<_Sent, _Iter>)
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return std::__rewrap_iter(std::move(__orig_iter), std::move(__iter));
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else
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return __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___ALGORITHM_UNWRAP_RANGE_H
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