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