libcxx/include/__cxx03/__algorithm/ranges_contains_subrange.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_CONTAINS_SUBRANGE_H
  10 #define _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H
  11
  12 #include <__cxx03/__algorithm/ranges_search.h>
  13 #include <__cxx03/__config>
  14 #include <__cxx03/__functional/identity.h>
  15 #include <__cxx03/__functional/ranges_operations.h>
  16 #include <__cxx03/__functional/reference_wrapper.h>
  17 #include <__cxx03/__iterator/concepts.h>
  18 #include <__cxx03/__iterator/indirectly_comparable.h>
  19 #include <__cxx03/__iterator/projected.h>
  20 #include <__cxx03/__ranges/access.h>
  21 #include <__cxx03/__ranges/concepts.h>
  22 #include <__cxx03/__ranges/size.h>
  23 #include <__cxx03/__ranges/subrange.h>
  24 #include <__cxx03/__utility/move.h>
  25
  26 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  27 #  pragma GCC system_header
  28 #endif
  29
  30 _LIBCPP_PUSH_MACROS
  31 #include <__cxx03/__undef_macros>
  32
  33 #if _LIBCPP_STD_VER >= 23
  34
  35 _LIBCPP_BEGIN_NAMESPACE_STD
  36
  37 namespace ranges {
  38 namespace __contains_subrange {
  39 struct __fn {
  40   template <forward_iterator _Iter1,
  41             sentinel_for<_Iter1> _Sent1,
  42             forward_iterator _Iter2,
  43             sentinel_for<_Iter2> _Sent2,
  44             class _Pred  = ranges::equal_to,
  45             class _Proj1 = identity,
  46             class _Proj2 = identity>
  47     requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
  48   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool static operator()(
  49       _Iter1 __first1,
  50       _Sent1 __last1,
  51       _Iter2 __first2,
  52       _Sent2 __last2,
  53       _Pred __pred   = {},
  54       _Proj1 __proj1 = {},
  55       _Proj2 __proj2 = {}) {
  56     if (__first2 == __last2)
  57       return true;
  58
  59     auto __ret = ranges::search(
  60         std::move(__first1), __last1, std::move(__first2), __last2, __pred, std::ref(__proj1), std::ref(__proj2));
  61     return __ret.empty() == false;
  62   }
  63
  64   template <forward_range _Range1,
  65             forward_range _Range2,
  66             class _Pred  = ranges::equal_to,
  67             class _Proj1 = identity,
  68             class _Proj2 = identity>
  69     requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>, _Pred, _Proj1, _Proj2>
  70   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool static
  71   operator()(_Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) {
  72     if constexpr (sized_range<_Range2>) {
  73       if (ranges::size(__range2) == 0)
  74         return true;
  75     } else {
  76       if (ranges::begin(__range2) == ranges::end(__range2))
  77         return true;
  78     }
  79
  80     auto __ret = ranges::search(__range1, __range2, __pred, std::ref(__proj1), std::ref(__proj2));
  81     return __ret.empty() == false;
  82   }
  83 };
  84 } // namespace __contains_subrange
  85
  86 inline namespace __cpo {
  87 inline constexpr auto contains_subrange = __contains_subrange::__fn{};
  88 } // namespace __cpo
  89 } // namespace ranges
  90
  91 _LIBCPP_END_NAMESPACE_STD
  92
  93 #endif // _LIBCPP_STD_VER >= 23
  94
  95 _LIBCPP_POP_MACROS
  96
  97 #endif // _LIBCPP___ALGORITHM_RANGES_CONTAINS_SUBRANGE_H