libcxx/include/__algorithm/ranges_find_first_of.h

   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
  34 namespace ranges {
  35 struct __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
  93 inline namespace __cpo {
  94 inline 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