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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_FIND_LAST_H
#define _LIBCPP___ALGORITHM_RANGES_FIND_LAST_H
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__functional/ranges_operations.h>
#include <__iterator/concepts.h>
#include <__iterator/indirectly_comparable.h>
#include <__iterator/next.h>
#include <__iterator/prev.h>
#include <__iterator/projected.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__ranges/subrange.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
#if _LIBCPP_STD_VER >= 23
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
template <class _Iter, class _Sent, class _Pred, class _Proj>
_LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
__find_last_impl(_Iter __first, _Sent __last, _Pred __pred, _Proj& __proj) {
if (__first == __last) {
return subrange<_Iter>(__first, __first);
}
if constexpr (bidirectional_iterator<_Iter>) {
auto __last_it = ranges::next(__first, __last);
for (auto __it = ranges::prev(__last_it); __it != __first; --__it) {
if (__pred(std::invoke(__proj, *__it))) {
return subrange<_Iter>(std::move(__it), std::move(__last_it));
}
}
if (__pred(std::invoke(__proj, *__first))) {
return subrange<_Iter>(std::move(__first), std::move(__last_it));
}
return subrange<_Iter>(__last_it, __last_it);
} else {
bool __found = false;
_Iter __found_it;
for (; __first != __last; ++__first) {
if (__pred(std::invoke(__proj, *__first))) {
__found = true;
__found_it = __first;
}
}
if (__found) {
return subrange<_Iter>(std::move(__found_it), std::move(__first));
} else {
return subrange<_Iter>(__first, __first);
}
}
}
namespace __find_last {
struct __fn {
template <class _Type>
struct __op {
const _Type& __value;
template <class _Elem>
_LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator()(_Elem&& __elem) const {
return std::forward<_Elem>(__elem) == __value;
}
};
template <forward_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity>
requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static subrange<_Iter>
operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) {
return ranges::__find_last_impl(std::move(__first), std::move(__last), __op<_Type>{__value}, __proj);
}
template <forward_range _Range, class _Type, class _Proj = identity>
requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static borrowed_subrange_t<_Range>
operator()(_Range&& __range, const _Type& __value, _Proj __proj = {}) {
return ranges::__find_last_impl(ranges::begin(__range), ranges::end(__range), __op<_Type>{__value}, __proj);
}
};
} // namespace __find_last
namespace __find_last_if {
struct __fn {
template <class _Pred>
struct __op {
_Pred& __pred;
template <class _Elem>
_LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator()(_Elem&& __elem) const {
return std::invoke(__pred, std::forward<_Elem>(__elem));
}
};
template <forward_iterator _Iter,
sentinel_for<_Iter> _Sent,
class _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static subrange<_Iter>
operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) {
return ranges::__find_last_impl(std::move(__first), std::move(__last), __op<_Pred>{__pred}, __proj);
}
template <forward_range _Range,
class _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static borrowed_subrange_t<_Range>
operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) {
return ranges::__find_last_impl(ranges::begin(__range), ranges::end(__range), __op<_Pred>{__pred}, __proj);
}
};
} // namespace __find_last_if
namespace __find_last_if_not {
struct __fn {
template <class _Pred>
struct __op {
_Pred& __pred;
template <class _Elem>
_LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator()(_Elem&& __elem) const {
return !std::invoke(__pred, std::forward<_Elem>(__elem));
}
};
template <forward_iterator _Iter,
sentinel_for<_Iter> _Sent,
class _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static subrange<_Iter>
operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) {
return ranges::__find_last_impl(std::move(__first), std::move(__last), __op<_Pred>{__pred}, __proj);
}
template <forward_range _Range,
class _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr static borrowed_subrange_t<_Range>
operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) {
return ranges::__find_last_impl(ranges::begin(__range), ranges::end(__range), __op<_Pred>{__pred}, __proj);
}
};
} // namespace __find_last_if_not
inline namespace __cpo {
inline constexpr auto find_last = __find_last::__fn{};
inline constexpr auto find_last_if = __find_last_if::__fn{};
inline constexpr auto find_last_if_not = __find_last_if_not::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER >= 23
_LIBCPP_POP_MACROS
#endif // _LIBCPP___ALGORITHM_RANGES_FIND_LAST_H
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