1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <algorithm>
10
11 // template<InputIterator Iter1, InputIterator Iter2,
12 // Predicate<auto, Iter1::value_type, Iter2::value_type> Pred>
13 // requires CopyConstructible<Pred>
14 // constexpr bool // constexpr after c++17
15 // equal(Iter1 first1, Iter1 last1, Iter2 first2, Pred pred);
16 //
17 // Introduced in C++14:
18 // template<InputIterator Iter1, InputIterator Iter2,
19 // Predicate<auto, Iter1::value_type, Iter2::value_type> Pred>
20 // requires CopyConstructible<Pred>
21 // constexpr bool // constexpr after c++17
22 // equal(Iter1 first1, Iter1 last1, Iter2 first2, Iter2 last2, Pred pred);
23
24
25 #include <algorithm>
26 #include <functional>
27 #include <cassert>
28
29 #include "test_macros.h"
30 #include "test_iterators.h"
31
32 #if TEST_STD_VER > 17
eq(int a,int b)33 TEST_CONSTEXPR bool eq(int a, int b) { return a == b; }
34
test_constexpr()35 TEST_CONSTEXPR bool test_constexpr() {
36 int ia[] = {1, 3, 6, 7};
37 int ib[] = {1, 3};
38 int ic[] = {1, 3, 5, 7};
39 typedef input_iterator<int*> II;
40 typedef bidirectional_iterator<int*> BI;
41
42 return !std::equal(std::begin(ia), std::end(ia), std::begin(ic) , eq)
43 && !std::equal(std::begin(ia), std::end(ia), std::begin(ic), std::end(ic), eq)
44 && std::equal(std::begin(ib), std::end(ib), std::begin(ic) , eq)
45 && !std::equal(std::begin(ib), std::end(ib), std::begin(ic), std::end(ic), eq)
46
47 && std::equal(II(std::begin(ib)), II(std::end(ib)), II(std::begin(ic)) , eq)
48 && !std::equal(BI(std::begin(ib)), BI(std::end(ib)), BI(std::begin(ic)), BI(std::end(ic)), eq)
49 ;
50 }
51 #endif
52
53
54 int comparison_count = 0;
55 template <typename T>
counting_equals(const T & a,const T & b)56 bool counting_equals ( const T &a, const T &b ) {
57 ++comparison_count;
58 return a == b;
59 }
60
main(int,char **)61 int main(int, char**)
62 {
63 int ia[] = {0, 1, 2, 3, 4, 5};
64 const unsigned s = sizeof(ia)/sizeof(ia[0]);
65 int ib[s] = {0, 1, 2, 5, 4, 5};
66 assert(std::equal(input_iterator<const int*>(ia),
67 input_iterator<const int*>(ia+s),
68 input_iterator<const int*>(ia),
69 std::equal_to<int>()));
70 #if TEST_STD_VER >= 14
71 assert(std::equal(input_iterator<const int*>(ia),
72 input_iterator<const int*>(ia+s),
73 input_iterator<const int*>(ia),
74 input_iterator<const int*>(ia+s),
75 std::equal_to<int>()));
76 assert(std::equal(random_access_iterator<const int*>(ia),
77 random_access_iterator<const int*>(ia+s),
78 random_access_iterator<const int*>(ia),
79 random_access_iterator<const int*>(ia+s),
80 std::equal_to<int>()));
81
82 comparison_count = 0;
83 assert(!std::equal(input_iterator<const int*>(ia),
84 input_iterator<const int*>(ia+s),
85 input_iterator<const int*>(ia),
86 input_iterator<const int*>(ia+s-1),
87 counting_equals<int>));
88 assert(comparison_count > 0);
89 comparison_count = 0;
90 assert(!std::equal(random_access_iterator<const int*>(ia),
91 random_access_iterator<const int*>(ia+s),
92 random_access_iterator<const int*>(ia),
93 random_access_iterator<const int*>(ia+s-1),
94 counting_equals<int>));
95 assert(comparison_count == 0);
96 #endif
97 assert(!std::equal(input_iterator<const int*>(ia),
98 input_iterator<const int*>(ia+s),
99 input_iterator<const int*>(ib),
100 std::equal_to<int>()));
101 #if TEST_STD_VER >= 14
102 assert(!std::equal(input_iterator<const int*>(ia),
103 input_iterator<const int*>(ia+s),
104 input_iterator<const int*>(ib),
105 input_iterator<const int*>(ib+s),
106 std::equal_to<int>()));
107 assert(!std::equal(random_access_iterator<const int*>(ia),
108 random_access_iterator<const int*>(ia+s),
109 random_access_iterator<const int*>(ib),
110 random_access_iterator<const int*>(ib+s),
111 std::equal_to<int>()));
112 #endif
113
114 #if TEST_STD_VER > 17
115 static_assert(test_constexpr());
116 #endif
117
118 return 0;
119 }
120