116 lines
3.9 KiB
C++
116 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___ALGORITHM_RANGES_EQUAL_H
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#define _LIBCPP___ALGORITHM_RANGES_EQUAL_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/distance.h>
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#include <__iterator/indirectly_comparable.h>
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#include <__ranges/access.h>
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#include <__ranges/concepts.h>
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#include <__utility/move.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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#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace ranges {
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namespace __equal {
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struct __fn {
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private:
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template <class _Iter1, class _Sent1,
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class _Iter2, class _Sent2,
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class _Pred,
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class _Proj1,
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class _Proj2>
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_LIBCPP_HIDE_FROM_ABI constexpr static
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bool __equal_impl(_Iter1 __first1, _Sent1 __last1,
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_Iter2 __first2, _Sent2 __last2,
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_Pred& __pred,
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_Proj1& __proj1,
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_Proj2& __proj2) {
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while (__first1 != __last1 && __first2 != __last2) {
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if (!std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__first2)))
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return false;
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++__first1;
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++__first2;
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}
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return __first1 == __last1 && __first2 == __last2;
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}
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public:
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template <input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
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input_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
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class _Pred = ranges::equal_to,
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class _Proj1 = identity,
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class _Proj2 = identity>
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requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
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_LIBCPP_HIDE_FROM_ABI constexpr
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bool operator()(_Iter1 __first1, _Sent1 __last1,
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_Iter2 __first2, _Sent2 __last2,
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_Pred __pred = {},
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_Proj1 __proj1 = {},
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_Proj2 __proj2 = {}) const {
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if constexpr (sized_sentinel_for<_Sent1, _Iter1> && sized_sentinel_for<_Sent2, _Iter2>) {
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if (__last1 - __first1 != __last2 - __first2)
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return false;
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}
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return __equal_impl(std::move(__first1), std::move(__last1),
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std::move(__first2), std::move(__last2),
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__pred,
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__proj1,
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__proj2);
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}
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template <input_range _Range1,
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input_range _Range2,
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class _Pred = ranges::equal_to,
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class _Proj1 = identity,
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class _Proj2 = identity>
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requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
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_LIBCPP_HIDE_FROM_ABI constexpr
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bool operator()(_Range1&& __range1,
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_Range2&& __range2,
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_Pred __pred = {},
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_Proj1 __proj1 = {},
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_Proj2 __proj2 = {}) const {
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if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
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if (ranges::distance(__range1) != ranges::distance(__range2))
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return false;
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}
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return __equal_impl(ranges::begin(__range1), ranges::end(__range1),
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ranges::begin(__range2), ranges::end(__range2),
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__pred,
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__proj1,
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__proj2);
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return false;
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}
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};
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} // namespace __equal
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inline namespace __cpo {
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inline constexpr auto equal = __equal::__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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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
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#endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_H
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