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 <__config>
15 #include <__iterator/distance.h>
16 #include <__iterator/iterator_traits.h>
17 
18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19 #  pragma GCC system_header
20 #  pragma clang include_instead(<algorithm>)
21 #endif
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
26 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
27 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate __pred) {
28   for (; __first1 != __last1; ++__first1, (void)++__first2)
29     if (!__pred(*__first1, *__first2))
30       return false;
31   return true;
32 }
33 
34 template <class _InputIterator1, class _InputIterator2>
35 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
36 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2) {
37   typedef typename iterator_traits<_InputIterator1>::value_type __v1;
38   typedef typename iterator_traits<_InputIterator2>::value_type __v2;
39   return _VSTD::equal(__first1, __last1, __first2, __equal_to<__v1, __v2>());
40 }
41 
42 #if _LIBCPP_STD_VER > 11
43 template <class _BinaryPredicate, class _InputIterator1, class _InputIterator2>
44 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
45 __equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2,
46         _BinaryPredicate __pred, input_iterator_tag, input_iterator_tag) {
47   for (; __first1 != __last1 && __first2 != __last2; ++__first1, (void)++__first2)
48     if (!__pred(*__first1, *__first2))
49       return false;
50   return __first1 == __last1 && __first2 == __last2;
51 }
52 
53 template <class _BinaryPredicate, class _RandomAccessIterator1, class _RandomAccessIterator2>
54 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
55 __equal(_RandomAccessIterator1 __first1, _RandomAccessIterator1 __last1, _RandomAccessIterator2 __first2,
56         _RandomAccessIterator2 __last2, _BinaryPredicate __pred, random_access_iterator_tag,
57         random_access_iterator_tag) {
58   if (_VSTD::distance(__first1, __last1) != _VSTD::distance(__first2, __last2))
59     return false;
60   return _VSTD::equal<_RandomAccessIterator1, _RandomAccessIterator2,
61                       _BinaryPredicate&>(__first1, __last1, __first2, __pred);
62 }
63 
64 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
65 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
66 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2,
67       _BinaryPredicate __pred) {
68   return _VSTD::__equal<_BinaryPredicate&>(
69       __first1, __last1, __first2, __last2, __pred, typename iterator_traits<_InputIterator1>::iterator_category(),
70       typename iterator_traits<_InputIterator2>::iterator_category());
71 }
72 
73 template <class _InputIterator1, class _InputIterator2>
74 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 bool
75 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
76   typedef typename iterator_traits<_InputIterator1>::value_type __v1;
77   typedef typename iterator_traits<_InputIterator2>::value_type __v2;
78   return _VSTD::__equal(__first1, __last1, __first2, __last2, __equal_to<__v1, __v2>(),
79                         typename iterator_traits<_InputIterator1>::iterator_category(),
80                         typename iterator_traits<_InputIterator2>::iterator_category());
81 }
82 #endif
83 
84 _LIBCPP_END_NAMESPACE_STD
85 
86 #endif // _LIBCPP___ALGORITHM_EQUAL_H
87