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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_SEARCH_N_H
#define _LIBCPP___ALGORITHM_RANGES_SEARCH_N_H
#include <__algorithm/iterator_operations.h>
#include <__algorithm/search_n.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/ranges_operations.h>
#include <__iterator/advance.h>
#include <__iterator/concepts.h>
#include <__iterator/distance.h>
#include <__iterator/incrementable_traits.h>
#include <__iterator/indirectly_comparable.h>
#include <__iterator/iterator_traits.h>
#include <__ranges/access.h>
#include <__ranges/concepts.h>
#include <__ranges/size.h>
#include <__ranges/subrange.h>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
_LIBCPP_BEGIN_NAMESPACE_STD
namespace ranges {
namespace __search_n {
struct __fn {
template <class _Iter1, class _Sent1, class _SizeT, class _Type, class _Pred, class _Proj>
_LIBCPP_HIDE_FROM_ABI static constexpr subrange<_Iter1> __ranges_search_n_impl(
_Iter1 __first, _Sent1 __last, _SizeT __count, const _Type& __value, _Pred& __pred, _Proj& __proj) {
if (__count == 0)
return {__first, __first};
if constexpr (sized_sentinel_for<_Sent1, _Iter1>) {
auto __size = ranges::distance(__first, __last);
if (__size < __count) {
ranges::advance(__first, __last);
return {__first, __first};
}
if constexpr (random_access_iterator<_Iter1>) {
auto __ret = __search_n_random_access_impl<_RangeAlgPolicy>(__first, __last,
__count,
__value,
__pred,
__proj,
__size);
return {std::move(__ret.first), std::move(__ret.second)};
}
}
auto __ret = std::__search_n_forward_impl<_RangeAlgPolicy>(__first, __last,
__count,
__value,
__pred,
__proj);
return {std::move(__ret.first), std::move(__ret.second)};
}
template <forward_iterator _Iter, sentinel_for<_Iter> _Sent,
class _Type,
class _Pred = ranges::equal_to,
class _Proj = identity>
requires indirectly_comparable<_Iter, const _Type*, _Pred, _Proj>
_LIBCPP_HIDE_FROM_ABI constexpr
subrange<_Iter> operator()(_Iter __first, _Sent __last,
iter_difference_t<_Iter> __count,
const _Type& __value,
_Pred __pred = {},
_Proj __proj = _Proj{}) const {
return __ranges_search_n_impl(__first, __last, __count, __value, __pred, __proj);
}
template <forward_range _Range, class _Type, class _Pred = ranges::equal_to, class _Proj = identity>
requires indirectly_comparable<iterator_t<_Range>, const _Type*, _Pred, _Proj>
_LIBCPP_HIDE_FROM_ABI constexpr
borrowed_subrange_t<_Range> operator()(_Range&& __range,
range_difference_t<_Range> __count,
const _Type& __value,
_Pred __pred = {},
_Proj __proj = {}) const {
auto __first = ranges::begin(__range);
if (__count <= 0)
return {__first, __first};
if constexpr (sized_range<_Range>) {
auto __size1 = ranges::size(__range);
if (__size1 < static_cast<range_size_t<_Range>>(__count)) {
ranges::advance(__first, ranges::end(__range));
return {__first, __first};
}
}
return __ranges_search_n_impl(ranges::begin(__range), ranges::end(__range), __count, __value, __pred, __proj);
}
};
} // namespace __search_n
inline namespace __cpo {
inline constexpr auto search_n = __search_n::__fn{};
} // namespace __cpo
} // namespace ranges
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)
#endif // _LIBCPP___ALGORITHM_RANGES_SEARCH_N_H
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