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 <RandomAccessIterator Iterator> |
14 | // reverse_iterator<Iter> operator+(Iter::difference_type n, const reverse_iterator<Iter>& x); // 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> |
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 = n + r; |
26 | assert(rr.base() == x); |
27 | } |
28 | |
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 | |
36 | int main(int, char**) { |
37 | tests(); |
38 | #if TEST_STD_VER > 14 |
39 | static_assert(tests(), "" ); |
40 | #endif |
41 | return 0; |
42 | } |
43 | |