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 namespace __starts_with { 36 struct __fn { 37 template <input_iterator _Iter1, 38 sentinel_for<_Iter1> _Sent1, 39 input_iterator _Iter2, 40 sentinel_for<_Iter2> _Sent2, 41 class _Pred = ranges::equal_to, 42 class _Proj1 = identity, 43 class _Proj2 = identity> 44 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2> operator__fn45 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI static constexpr bool operator()( 46 _Iter1 __first1, 47 _Sent1 __last1, 48 _Iter2 __first2, 49 _Sent2 __last2, 50 _Pred __pred = {}, 51 _Proj1 __proj1 = {}, 52 _Proj2 __proj2 = {}) { 53 return __mismatch::__fn::__go( 54 std::move(__first1), 55 std::move(__last1), 56 std::move(__first2), 57 std::move(__last2), 58 __pred, 59 __proj1, 60 __proj2) 61 .in2 == __last2; 62 } 63 64 template <input_range _Range1, 65 input_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 static constexpr bool operator__fn71 operator()(_Range1&& __range1, _Range2&& __range2, _Pred __pred = {}, _Proj1 __proj1 = {}, _Proj2 __proj2 = {}) { 72 return __mismatch::__fn::__go( 73 ranges::begin(__range1), 74 ranges::end(__range1), 75 ranges::begin(__range2), 76 ranges::end(__range2), 77 __pred, 78 __proj1, 79 __proj2) 80 .in2 == ranges::end(__range2); 81 } 82 }; 83 } // namespace __starts_with 84 inline namespace __cpo { 85 inline constexpr auto starts_with = __starts_with::__fn{}; 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_STARTS_WITH_H 96