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/predicate_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 < 45 class _Tp, 46 class _Up, 47 class _BinaryPredicate, 48 __enable_if_t<__is_trivial_equality_predicate<_BinaryPredicate, _Tp, _Up>::value && !is_volatile<_Tp>::value && 49 !is_volatile<_Up>::value && __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value, 50 int> = 0> 51 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 52 __equal_iter_impl(_Tp* __first1, _Tp* __last1, _Up* __first2, _BinaryPredicate&) { 53 return std::__constexpr_memcmp_equal(__first1, __first2, __element_count(__last1 - __first1)); 54 } 55 56 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate> 57 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 58 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate __pred) { 59 return std::__equal_iter_impl( 60 std::__unwrap_iter(__first1), std::__unwrap_iter(__last1), std::__unwrap_iter(__first2), __pred); 61 } 62 63 template <class _InputIterator1, class _InputIterator2> 64 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 65 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2) { 66 return std::equal(__first1, __last1, __first2, __equal_to()); 67 } 68 69 #if _LIBCPP_STD_VER >= 14 70 template <class _BinaryPredicate, class _InputIterator1, class _InputIterator2> 71 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 72 __equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, 73 _BinaryPredicate __pred, input_iterator_tag, input_iterator_tag) { 74 for (; __first1 != __last1 && __first2 != __last2; ++__first1, (void)++__first2) 75 if (!__pred(*__first1, *__first2)) 76 return false; 77 return __first1 == __last1 && __first2 == __last2; 78 } 79 80 template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2> 81 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __equal_impl( 82 _Iter1 __first1, _Sent1 __last1, _Iter2 __first2, _Sent2 __last2, _Pred& __comp, _Proj1& __proj1, _Proj2& __proj2) { 83 while (__first1 != __last1 && __first2 != __last2) { 84 if (!std::__invoke(__comp, std::__invoke(__proj1, *__first1), std::__invoke(__proj2, *__first2))) 85 return false; 86 ++__first1; 87 ++__first2; 88 } 89 return __first1 == __last1 && __first2 == __last2; 90 } 91 92 template <class _Tp, 93 class _Up, 94 class _Pred, 95 class _Proj1, 96 class _Proj2, 97 __enable_if_t<__is_trivial_equality_predicate<_Pred, _Tp, _Up>::value && __is_identity<_Proj1>::value && 98 __is_identity<_Proj2>::value && !is_volatile<_Tp>::value && !is_volatile<_Up>::value && 99 __libcpp_is_trivially_equality_comparable<_Tp, _Up>::value, 100 int> = 0> 101 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __equal_impl( 102 _Tp* __first1, _Tp* __last1, _Up* __first2, _Up*, _Pred&, _Proj1&, _Proj2&) { 103 return std::__constexpr_memcmp_equal(__first1, __first2, __element_count(__last1 - __first1)); 104 } 105 106 template <class _BinaryPredicate, class _RandomAccessIterator1, class _RandomAccessIterator2> 107 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 108 __equal(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1, _RandomAccessIterator2 __first2, 109 _RandomAccessIterator2 __last2, _BinaryPredicate __pred, random_access_iterator_tag, 110 random_access_iterator_tag) { 111 if (_VSTD::distance(__first1, __last1) != _VSTD::distance(__first2, __last2)) 112 return false; 113 __identity __proj; 114 return std::__equal_impl( 115 std::__unwrap_iter(__first1), 116 std::__unwrap_iter(__last1), 117 std::__unwrap_iter(__first2), 118 std::__unwrap_iter(__last2), 119 __pred, 120 __proj, 121 __proj); 122 } 123 124 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate> 125 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 126 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, 127 _BinaryPredicate __pred) { 128 return _VSTD::__equal<_BinaryPredicate&>( 129 __first1, __last1, __first2, __last2, __pred, typename iterator_traits<_InputIterator1>::iterator_category(), 130 typename iterator_traits<_InputIterator2>::iterator_category()); 131 } 132 133 template <class _InputIterator1, class _InputIterator2> 134 _LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool 135 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) { 136 return std::__equal( 137 __first1, 138 __last1, 139 __first2, 140 __last2, 141 __equal_to(), 142 typename iterator_traits<_InputIterator1>::iterator_category(), 143 typename iterator_traits<_InputIterator2>::iterator_category()); 144 } 145 #endif 146 147 _LIBCPP_END_NAMESPACE_STD 148 149 #endif // _LIBCPP___ALGORITHM_EQUAL_H 150