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 // reverse_iterator& operator++(); // constexpr in C++17
14 
15 #include <iterator>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 #include "test_iterators.h"
20 
21 template <class It>
22 TEST_CONSTEXPR_CXX17 void test(It i, It x) {
23     std::reverse_iterator<It> r(i);
24     std::reverse_iterator<It>& rr = ++r;
25     assert(r.base() == x);
26     assert(&rr == &r);
27 }
28 
29 TEST_CONSTEXPR_CXX17 bool tests() {
30     const char* s = "123";
31     test(bidirectional_iterator<const char*>(s+1), bidirectional_iterator<const char*>(s));
32     test(random_access_iterator<const char*>(s+1), random_access_iterator<const char*>(s));
33 #if TEST_STD_VER >= 20
34     test(cpp20_random_access_iterator<const char*>(s + 1), cpp20_random_access_iterator<const char*>(s));
35 #endif
36     test(s+1, s);
37     return true;
38 }
39 
40 int main(int, char**) {
41     tests();
42 #if TEST_STD_VER > 14
43     static_assert(tests(), "");
44 #endif
45     return 0;
46 }
47