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 // requires RandomAccessIterator<Iter>
14 // reverse_iterator operator+(difference_type n) const; // constexpr in C++17
15
16 #include <iterator>
17 #include <cassert>
18
19 #include "test_macros.h"
20 #include "test_iterators.h"
21
22 template <class It>
test(It i,typename std::iterator_traits<It>::difference_type n,It x)23 TEST_CONSTEXPR_CXX17 void test(It i, typename std::iterator_traits<It>::difference_type n, It x) {
24 const std::reverse_iterator<It> r(i);
25 std::reverse_iterator<It> rr = r + n;
26 assert(rr.base() == x);
27 }
28
tests()29 TEST_CONSTEXPR_CXX17 bool tests() {
30 const char* s = "1234567890";
31 test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
32 test(s+5, 5, s);
33 return true;
34 }
35
main(int,char **)36 int main(int, char**) {
37 tests();
38 #if TEST_STD_VER > 14
39 static_assert(tests(), "");
40 #endif
41 return 0;
42 }
43