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___CXX03___ALGORITHM_EQUAL_H
11 #define _LIBCPP___CXX03___ALGORITHM_EQUAL_H
12
13 #include <__cxx03/__algorithm/comp.h>
14 #include <__cxx03/__algorithm/unwrap_iter.h>
15 #include <__cxx03/__config>
16 #include <__cxx03/__functional/identity.h>
17 #include <__cxx03/__iterator/distance.h>
18 #include <__cxx03/__iterator/iterator_traits.h>
19 #include <__cxx03/__string/constexpr_c_functions.h>
20 #include <__cxx03/__type_traits/desugars_to.h>
21 #include <__cxx03/__type_traits/enable_if.h>
22 #include <__cxx03/__type_traits/invoke.h>
23 #include <__cxx03/__type_traits/is_equality_comparable.h>
24 #include <__cxx03/__type_traits/is_volatile.h>
25 #include <__cxx03/__utility/move.h>
26
27 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
28 # pragma GCC system_header
29 #endif
30
31 _LIBCPP_PUSH_MACROS
32 #include <__cxx03/__undef_macros>
33
34 _LIBCPP_BEGIN_NAMESPACE_STD
35
36 template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
__equal_iter_impl(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_BinaryPredicate & __pred)37 _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI bool __equal_iter_impl(
38 _InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate& __pred) {
39 for (; __first1 != __last1; ++__first1, (void)++__first2)
40 if (!__pred(*__first1, *__first2))
41 return false;
42 return true;
43 }
44
45 template <class _Tp,
46 class _Up,
47 class _BinaryPredicate,
48 __enable_if_t<__desugars_to_v<__equal_tag, _BinaryPredicate, _Tp, _Up> && !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 bool
__equal_iter_impl(_Tp * __first1,_Tp * __last1,_Up * __first2,_BinaryPredicate &)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 inline _LIBCPP_HIDE_FROM_ABI bool
equal(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2,_BinaryPredicate __pred)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 inline _LIBCPP_HIDE_FROM_ABI bool
equal(_InputIterator1 __first1,_InputIterator1 __last1,_InputIterator2 __first2)65 equal(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2) {
66 return std::equal(__first1, __last1, __first2, __equal_to());
67 }
68
69 _LIBCPP_END_NAMESPACE_STD
70
71 _LIBCPP_POP_MACROS
72
73 #endif // _LIBCPP___CXX03___ALGORITHM_EQUAL_H
74