libcxx/include/__algorithm/ranges_starts_with.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_STARTS_WITH_H
  10 #define _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H
  11
  12 #include <__algorithm/in_in_result.h>
  13 #include <__algorithm/ranges_mismatch.h>
  14 #include <__config>
  15 #include <__functional/identity.h>
  16 #include <__functional/ranges_operations.h>
  17 #include <__iterator/concepts.h>
  18 #include <__iterator/indirectly_comparable.h>
  19 #include <__ranges/access.h>
  20 #include <__ranges/concepts.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 >= 23
  28
  29 _LIBCPP_BEGIN_NAMESPACE_STD
  30
  31 namespace ranges {
  32 namespace __starts_with {
  33 struct __fn {
  34   template <input_iterator _Iter1,
  35             sentinel_for<_Iter1> _Sent1,
  36             input_iterator _Iter2,
  37             sentinel_for<_Iter2> _Sent2,
  38             class _Pred  = ranges::equal_to,
  39             class _Proj1 = identity,
  40             class _Proj2 = identity>
  41     requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
  42   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
  43       _Iter1 __first1,
  44       _Sent1 __last1,
  45       _Iter2 __first2,
  46       _Sent2 __last2,
  47       _Pred __pred   = {},
  48       _Proj1 __proj1 = {},
  49       _Proj2 __proj2 = {}) const {
  50     return __mismatch::__fn::__go(
  51                std::move(__first1),
  52                std::move(__last1),
  53                std::move(__first2),
  54                std::move(__last2),
  55                __pred,
  56                __proj1,
  57                __proj2)
  58                .in2 == __last2;
  59   }
  60
  61   template <input_range _Range1,
  62             input_range _Range2,
  63             class _Pred  = ranges::equal_to,
  64             class _Proj1 = identity,
  65             class _Proj2 = identity>
  66     requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
  67   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr bool operator()(
  68       _Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const {
  69     return __mismatch::__fn::__go(
  70                ranges::begin(__range1),
  71                ranges::end(__range1),
  72                ranges::begin(__range2),
  73                ranges::end(__range2),
  74                __pred,
  75                __proj1,
  76                __proj2)
  77                .in2 == ranges::end(__range2);
  78   }
  79 };
  80 } // namespace __starts_with
  81 inline namespace __cpo {
  82 inline constexpr auto starts_with = __starts_with::__fn{};
  83 } // namespace __cpo
  84 } // namespace ranges
  85
  86 _LIBCPP_END_NAMESPACE_STD
  87
  88 #endif // _LIBCPP_STD_VER >= 23
  89
  90 #endif // _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H