| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <iterator> |
| |
| // reverse_iterator |
| |
| // template <RandomAccessIterator Iterator> |
| // constexpr reverse_iterator<Iter> |
| // operator+(Iter::difference_type n, const reverse_iterator<Iter>& x); |
| // |
| // constexpr in C++17 |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class It> |
| void |
| test(It i, typename std::iterator_traits<It>::difference_type n, It x) |
| { |
| const std::reverse_iterator<It> r(i); |
| std::reverse_iterator<It> rr = n + r; |
| assert(rr.base() == x); |
| } |
| |
| int main(int, char**) |
| { |
| const char* s = "1234567890"; |
| test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s)); |
| test(s+5, 5, s); |
| |
| #if TEST_STD_VER > 14 |
| { |
| constexpr const char *p = "123456789"; |
| typedef std::reverse_iterator<const char *> RI; |
| constexpr RI it1 = std::make_reverse_iterator(p); |
| constexpr RI it2 = std::make_reverse_iterator(p + 5); |
| constexpr RI it3 = 5 + it2; |
| static_assert(it1 != it2, ""); |
| static_assert(it1 == it3, ""); |
| static_assert(it2 != it3, ""); |
| } |
| #endif |
| |
| return 0; |
| } |