1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___ALGORITHM_EQUAL_H 11 #define _LIBCPP___ALGORITHM_EQUAL_H 12 13 #include <__algorithm/comp.h> 14 #include <__algorithm/unwrap_iter.h> 15 #include <__config> 16 #include <__functional/identity.h> 17 #include <__functional/invoke.h> 18 #include <__iterator/distance.h> 19 #include <__iterator/iterator_traits.h> 20 #include <__string/constexpr_c_functions.h> 21 #include <__type_traits/enable_if.h> 22 #include <__type_traits/integral_constant.h> 23 #include <__type_traits/is_constant_evaluated.h> 24 #include <__type_traits/is_equality_comparable.h> 25 #include <__type_traits/is_volatile.h> 26 #include <__type_traits/operation_traits.h> 27 #include <__utility/move.h> 28 29 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 30 # pragma GCC system_header 31 #endif 32 33 _LIBCPP_BEGIN_NAMESPACE_STD 34 35 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate> 36 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __equal_iter_impl( 37 _InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate& __pred) { 38 for (; __first1 != __last1; ++__first1, (void)++__first2) 39 if (!__pred(*__first1, *__first2)) 40 return false; 41 return true; 42 } 43 44 template <class _Tp, 45 class _Up, 46 class _BinaryPredicate, 47 __enable_if_t<__desugars_to<__equal_tag, _BinaryPredicate, _Tp, _Up>::value && !is_volatile<_Tp>::value && 48 !is_volatile<_Up>::value && __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value, 49 int> = 0> 50 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 51 __equal_iter_impl(_Tp* __first1, _Tp* __last1, _Up* __first2, _BinaryPredicate&) { 52 return std::__constexpr_memcmp_equal(__first1, __first2, __element_count(__last1 - __first1)); 53 } 54 55 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate> 56 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 57 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate __pred) { 58 return std::__equal_iter_impl( 59 std::__unwrap_iter(__first1), std::__unwrap_iter(__last1), std::__unwrap_iter(__first2), __pred); 60 } 61 62 template <class _InputIterator1, class _InputIterator2> 63 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 64 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2) { 65 return std::equal(__first1, __last1, __first2, __equal_to()); 66 } 67 68 #if _LIBCPP_STD_VER >= 14 69 template <class _BinaryPredicate, class _InputIterator1, class _InputIterator2> 70 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 71 __equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, 72 _BinaryPredicate __pred, input_iterator_tag, input_iterator_tag) { 73 for (; __first1 != __last1 && __first2 != __last2; ++__first1, (void)++__first2) 74 if (!__pred(*__first1, *__first2)) 75 return false; 76 return __first1 == __last1 && __first2 == __last2; 77 } 78 79 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2> 80 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __equal_impl( 81 _Iter1 __first1, _Sent1 __last1, _Iter2 __first2, _Sent2 __last2, _Pred& __comp, _Proj1& __proj1, _Proj2& __proj2) { 82 while (__first1 != __last1 && __first2 != __last2) { 83 if (!std::__invoke(__comp, std::__invoke(__proj1, *__first1), std::__invoke(__proj2, *__first2))) 84 return false; 85 ++__first1; 86 ++__first2; 87 } 88 return __first1 == __last1 && __first2 == __last2; 89 } 90 91 template <class _Tp, 92 class _Up, 93 class _Pred, 94 class _Proj1, 95 class _Proj2, 96 __enable_if_t<__desugars_to<__equal_tag, _Pred, _Tp, _Up>::value && __is_identity<_Proj1>::value && 97 __is_identity<_Proj2>::value && !is_volatile<_Tp>::value && !is_volatile<_Up>::value && 98 __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value, 99 int> = 0> 100 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 101 __equal_impl(_Tp* __first1, _Tp* __last1, _Up* __first2, _Up*, _Pred&, _Proj1&, _Proj2&) { 102 return std::__constexpr_memcmp_equal(__first1, __first2, __element_count(__last1 - __first1)); 103 } 104 105 template <class _BinaryPredicate, class _RandomAccessIterator1, class _RandomAccessIterator2> 106 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 107 __equal(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1, _RandomAccessIterator2 __first2, 108 _RandomAccessIterator2 __last2, _BinaryPredicate __pred, random_access_iterator_tag, 109 random_access_iterator_tag) { 110 if (_VSTD::distance(__first1, __last1) != _VSTD::distance(__first2, __last2)) 111 return false; 112 __identity __proj; 113 return std::__equal_impl( 114 std::__unwrap_iter(__first1), 115 std::__unwrap_iter(__last1), 116 std::__unwrap_iter(__first2), 117 std::__unwrap_iter(__last2), 118 __pred, 119 __proj, 120 __proj); 121 } 122 123 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate> 124 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 125 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, 126 _BinaryPredicate __pred) { 127 return _VSTD::__equal<_BinaryPredicate&>( 128 __first1, __last1, __first2, __last2, __pred, typename iterator_traits<_InputIterator1>::iterator_category(), 129 typename iterator_traits<_InputIterator2>::iterator_category()); 130 } 131 132 template <class _InputIterator1, class _InputIterator2> 133 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 134 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) { 135 return std::__equal( 136 __first1, 137 __last1, 138 __first2, 139 __last2, 140 __equal_to(), 141 typename iterator_traits<_InputIterator1>::iterator_category(), 142 typename iterator_traits<_InputIterator2>::iterator_category()); 143 } 144 #endif 145 146 _LIBCPP_END_NAMESPACE_STD 147 148 #endif // _LIBCPP___ALGORITHM_EQUAL_H 149