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 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> operator__fn48 [[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 operator__fn71 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 98