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 // <iterator>
10
11 // reverse_iterator
12
13 // template <BidirectionalIterator Iter1, BidirectionalIterator Iter2>
14 // requires HasEqualTo<Iter1, Iter2>
15 // bool operator==(const reverse_iterator<Iter1>& x, const reverse_iterator<Iter2>& y); // constexpr since C++17
16
17 #include <iterator>
18 #include <cassert>
19
20 #include "test_macros.h"
21 #include "test_iterators.h"
22
23 template <class It>
test(It l,It r,bool x)24 TEST_CONSTEXPR_CXX17 void test(It l, It r, bool x) {
25 const std::reverse_iterator<It> r1(l);
26 const std::reverse_iterator<It> r2(r);
27 assert((r1 == r2) == x);
28 }
29
tests()30 TEST_CONSTEXPR_CXX17 bool tests() {
31 const char* s = "1234567890";
32 test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s), true);
33 test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+1), false);
34 test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), true);
35 test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+1), false);
36 test(s, s, true);
37 test(s, s+1, false);
38 return true;
39 }
40
main(int,char **)41 int main(int, char**) {
42 tests();
43 #if TEST_STD_VER > 14
44 static_assert(tests(), "");
45 #endif
46 return 0;
47 }
48