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 #if _LIBCPP_STD_VER >= 20
  28
  29 _LIBCPP_BEGIN_NAMESPACE_STD
  30
  31 namespace ranges {
  32 namespace __find_first_of {
  33 struct __fn {
  34   template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
  35   _LIBCPP_HIDE_FROM_ABI constexpr static _Iter1 __find_first_of_impl(
  36       _Iter1 __first1,
  37       _Sent1 __last1,
  38       _Iter2 __first2,
  39       _Sent2 __last2,
  40       _Pred& __pred,
  41       _Proj1& __proj1,
  42       _Proj2& __proj2) {
  43     for (; __first1 != __last1; ++__first1) {
  44       for (auto __j = __first2; __j != __last2; ++__j) {
  45         if (std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__j)))
  46           return __first1;
  47       }
  48     }
  49     return __first1;
  50   }
  51
  52   template <input_iterator _Iter1,
  53             sentinel_for<_Iter1> _Sent1,
  54             forward_iterator _Iter2,
  55             sentinel_for<_Iter2> _Sent2,
  56             class _Pred  = ranges::equal_to,
  57             class _Proj1 = identity,
  58             class _Proj2 = identity>
  59     requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
  60   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr _Iter1 operator()(
  61       _Iter1 __first1,
  62       _Sent1 __last1,
  63       _Iter2 __first2,
  64       _Sent2 __last2,
  65       _Pred __pred   = {},
  66       _Proj1 __proj1 = {},
  67       _Proj2 __proj2 = {}) const {
  68     return __find_first_of_impl(
  69         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
  70   }
  71
  72   template <input_range _Range1,
  73             forward_range _Range2,
  74             class _Pred  = ranges::equal_to,
  75             class _Proj1 = identity,
  76             class _Proj2 = identity>
  77     requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
  78   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range1> operator()(
  79       _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
  80     return __find_first_of_impl(
  81         ranges::begin(__range1),
  82         ranges::end(__range1),
  83         ranges::begin(__range2),
  84         ranges::end(__range2),
  85         __pred,
  86         __proj1,
  87         __proj2);
  88   }
  89 };
  90 } // namespace __find_first_of
  91
  92 inline namespace __cpo {
  93 inline constexpr auto find_first_of = __find_first_of::__fn{};
  94 } // namespace __cpo
  95 } // namespace ranges
  96
  97 _LIBCPP_END_NAMESPACE_STD
  98
  99 #endif // _LIBCPP_STD_VER >= 20
 100
 101 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H