libcxx/include/__cxx03/__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 <__cxx03/__config>
  13 #include <__cxx03/__functional/identity.h>
  14 #include <__cxx03/__functional/invoke.h>
  15 #include <__cxx03/__functional/ranges_operations.h>
  16 #include <__cxx03/__iterator/concepts.h>
  17 #include <__cxx03/__iterator/indirectly_comparable.h>
  18 #include <__cxx03/__ranges/access.h>
  19 #include <__cxx03/__ranges/concepts.h>
  20 #include <__cxx03/__ranges/dangling.h>
  21 #include <__cxx03/__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 <__cxx03/__undef_macros>
  29
  30 #if _LIBCPP_STD_VER >= 20
  31
  32 _LIBCPP_BEGIN_NAMESPACE_STD
  33
  34 namespace ranges {
  35 namespace __find_first_of {
  36 struct __fn {
  37   template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
  38   _LIBCPP_HIDE_FROM_ABI constexpr static _Iter1 __find_first_of_impl(
  39       _Iter1 __first1,
  40       _Sent1 __last1,
  41       _Iter2 __first2,
  42       _Sent2 __last2,
  43       _Pred& __pred,
  44       _Proj1& __proj1,
  45       _Proj2& __proj2) {
  46     for (; __first1 != __last1; ++__first1) {
  47       for (auto __j = __first2; __j != __last2; ++__j) {
  48         if (std::invoke(__pred, std::invoke(__proj1, *__first1), std::invoke(__proj2, *__j)))
  49           return __first1;
  50       }
  51     }
  52     return __first1;
  53   }
  54
  55   template <input_iterator _Iter1,
  56             sentinel_for<_Iter1> _Sent1,
  57             forward_iterator _Iter2,
  58             sentinel_for<_Iter2> _Sent2,
  59             class _Pred  = ranges::equal_to,
  60             class _Proj1 = identity,
  61             class _Proj2 = identity>
  62     requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
  63   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr _Iter1 operator()(
  64       _Iter1 __first1,
  65       _Sent1 __last1,
  66       _Iter2 __first2,
  67       _Sent2 __last2,
  68       _Pred __pred   = {},
  69       _Proj1 __proj1 = {},
  70       _Proj2 __proj2 = {}) const {
  71     return __find_first_of_impl(
  72         std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
  73   }
  74
  75   template <input_range _Range1,
  76             forward_range _Range2,
  77             class _Pred  = ranges::equal_to,
  78             class _Proj1 = identity,
  79             class _Proj2 = identity>
  80     requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
  81   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_iterator_t<_Range1> operator()(
  82       _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
  83     return __find_first_of_impl(
  84         ranges::begin(__range1),
  85         ranges::end(__range1),
  86         ranges::begin(__range2),
  87         ranges::end(__range2),
  88         __pred,
  89         __proj1,
  90         __proj2);
  91   }
  92 };
  93 } // namespace __find_first_of
  94
  95 inline namespace __cpo {
  96 inline constexpr auto find_first_of = __find_first_of::__fn{};
  97 } // namespace __cpo
  98 } // namespace ranges
  99
 100 _LIBCPP_END_NAMESPACE_STD
 101
 102 #endif // _LIBCPP_STD_VER >= 20
 103
 104 _LIBCPP_POP_MACROS
 105
 106 #endif // _LIBCPP___ALGORITHM_RANGES_FIND_FIRST_OF_H