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 94