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 _LIBCPP_PUSH_MACROS
  28 #include <__undef_macros>
  29
  30 #if _LIBCPP_STD_VER >= 23
  31
  32 _LIBCPP_BEGIN_NAMESPACE_STD
  33
  34 namespace ranges {
  35 struct __starts_with {
  36   template <input_iterator _Iter1,
  37             sentinel_for<_Iter1> _Sent1,
  38             input_iterator _Iter2,
  39             sentinel_for<_Iter2> _Sent2,
  40             class _Pred  = ranges::equal_to,
  41             class _Proj1 = identity,
  42             class _Proj2 = identity>
  43     requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
  44   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static constexpr bool operator()(
  45       _Iter1 __first1,
  46       _Sent1 __last1,
  47       _Iter2 __first2,
  48       _Sent2 __last2,
  49       _Pred __pred   = {},
  50       _Proj1 __proj1 = {},
  51       _Proj2 __proj2 = {}) {
  52     return __mismatch::__go(
  53                std::move(__first1),
  54                std::move(__last1),
  55                std::move(__first2),
  56                std::move(__last2),
  57                __pred,
  58                __proj1,
  59                __proj2)
  60                .in2 == __last2;
  61   }
  62
  63   template <input_range _Range1,
  64             input_range _Range2,
  65             class _Pred  = ranges::equal_to,
  66             class _Proj1 = identity,
  67             class _Proj2 = identity>
  68     requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
  69   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static constexpr bool
  70   operator()(_Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) {
  71     return __mismatch::__go(
  72                ranges::begin(__range1),
  73                ranges::end(__range1),
  74                ranges::begin(__range2),
  75                ranges::end(__range2),
  76                __pred,
  77                __proj1,
  78                __proj2)
  79                .in2 == ranges::end(__range2);
  80   }
  81 };
  82 inline namespace __cpo {
  83 inline constexpr auto starts_with = __starts_with{};
  84 } // namespace __cpo
  85 } // namespace ranges
  86
  87 _LIBCPP_END_NAMESPACE_STD
  88
  89 #endif // _LIBCPP_STD_VER >= 23
  90
  91 _LIBCPP_POP_MACROS
  92
  93 #endif // _LIBCPP___ALGORITHM_RANGES_STARTS_WITH_H