xref: /freebsd/contrib/llvm-project/libcxx/include/__cxx03/__algorithm/equal.h (revision 700637cbb5e582861067a11aaca4d053546871d2)
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