1//===----------------------------------------------------------------------===//
  2//
  3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4// See https://llvm.org/LICENSE.txt for license information.
  5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6//
  7//===----------------------------------------------------------------------===//
  8
  9#ifndef _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H
 10#define _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H
 11
 12#include <__config>
 13#include <__functional/identity.h>
 14#include <__functional/invoke.h>
 15#include <__functional/ranges_operations.h>
 16#include <__iterator/concepts.h>
 17#include <__iterator/indirectly_comparable.h>
 18#include <__ranges/access.h>
 19#include <__ranges/concepts.h>
 20#include <__ranges/dangling.h>
 21#include <__utility/move.h>
 22
 23#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 24#  pragma GCC system_header
 25#endif
 26
 27_LIBCPP_PUSH_MACROS
 28#include <__undef_macros>
 29
 30#if _LIBCPP_STD_VER >= 20
 31
 32_LIBCPP_BEGIN_NAMESPACE_STD
 33
 34namespace ranges {
 35struct __find_first_of {
 36  template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
 37  _LIBCPP_HIDE_FROM_ABI constexpr static _Iter1 __find_first_of_impl(
 38      _Iter1 __first1,
 39      _Sent1 __last1,
 40      _Iter2 __first2,
 41      _Sent2 __last2,
 42      _Pred& __pred,
 43      _Proj1& __proj1,
 44      _Proj2& __proj2) {
 45    for (; __first1 != __last1; ++__first1) {
 46      for (auto __j = __first2; __j != __last2; ++__j) {
 47        if (std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__j)))
 48          return __first1;
 49      }
 50    }
 51    return __first1;
 52  }
 53
 54  template <input_iterator _Iter1,
 55            sentinel_for<_Iter1> _Sent1,
 56            forward_iterator _Iter2,
 57            sentinel_for<_Iter2> _Sent2,
 58            class _Pred  = ranges::equal_to,
 59            class _Proj1 = identity,
 60            class _Proj2 = identity>
 61    requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
 62  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Iter1 operator()(
 63      _Iter1 __first1,
 64      _Sent1 __last1,
 65      _Iter2 __first2,
 66      _Sent2 __last2,
 67      _Pred __pred   = {},
 68      _Proj1 __proj1 = {},
 69      _Proj2 __proj2 = {}) const {
 70    return __find_first_of_impl(
 71        std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
 72  }
 73
 74  template <input_range _Range1,
 75            forward_range _Range2,
 76            class _Pred  = ranges::equal_to,
 77            class _Proj1 = identity,
 78            class _Proj2 = identity>
 79    requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
 80  [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range1> operator()(
 81      _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
 82    return __find_first_of_impl(
 83        ranges::begin(__range1),
 84        ranges::end(__range1),
 85        ranges::begin(__range2),
 86        ranges::end(__range2),
 87        __pred,
 88        __proj1,
 89        __proj2);
 90  }
 91};
 92
 93inline namespace __cpo {
 94inline constexpr auto find_first_of = __find_first_of{};
 95} // namespace __cpo
 96} // namespace ranges
 97
 98_LIBCPP_END_NAMESPACE_STD
 99
100#endif // _LIBCPP_STD_VER >= 20
101
102_LIBCPP_POP_MACROS
103
104#endif // _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H