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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_RANGES_EQUAL_H
#define _LIBCPP___ALGORITHM_RANGES_EQUAL_H
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__functional/ranges_operations.h>
#include <__iterator/concepts.h>
#include <__iterator/distance.h>
#include <__iterator/indirectly_comparable.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER > 17
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
namespace __equal {
struct __fn {
private:
template <class _Iter1, class _Sent1,
class _Iter2, class _Sent2,
class _Pred,
class _Proj1,
class _Proj2>
_LIBCPP_HIDE_FROM_ABI constexpr static
bool __equal_impl(_Iter1 __first1, _Sent1 __last1,
_Iter2 __first2, _Sent2 __last2,
_Pred& __pred,
_Proj1& __proj1,
_Proj2& __proj2) {
while (__first1 != __last1 && __first2 != __last2) {
if (!std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__first2)))
return false;
++__first1;
++__first2;
}
return __first1 == __last1 && __first2 == __last2;
}
public:
template <input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
input_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
class _Pred = ranges::equal_to,
class _Proj1 = identity,
class _Proj2 = identity>
requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
bool operator()(_Iter1 __first1, _Sent1 __last1,
_Iter2 __first2, _Sent2 __last2,
_Pred __pred = {},
_Proj1 __proj1 = {},
_Proj2 __proj2 = {}) const {
if constexpr (sized_sentinel_for<_Sent1, _Iter1> && sized_sentinel_for<_Sent2, _Iter2>) {
if (__last1 - __first1 != __last2 - __first2)
return false;
}
return __equal_impl(std::move(__first1), std::move(__last1),
std::move(__first2), std::move(__last2),
__pred,
__proj1,
__proj2);
}
template <input_range _Range1,
input_range _Range2,
class _Pred = ranges::equal_to,
class _Proj1 = identity,
class _Proj2 = identity>
requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
bool operator()(_Range1&& __range1,
_Range2&& __range2,
_Pred __pred = {},
_Proj1 __proj1 = {},
_Proj2 __proj2 = {}) const {
if constexpr (sized_range<_Range1> && sized_range<_Range2>) {
if (ranges::distance(__range1) != ranges::distance(__range2))
return false;
}
return __equal_impl(ranges::begin(__range1), ranges::end(__range1),
ranges::begin(__range2), ranges::end(__range2),
__pred,
__proj1,
__proj2);
return false;
}
};
} // namespace __equal
inline namespace __cpo {
inline constexpr auto equal = __equal::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER > 17
#endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_H
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