| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| |
| // reverse_iterator |
| |
| #include <iterator> |
| |
| #include "test_iterators.h" |
| |
| template<class T> concept HasMinus = requires (T t) { t - t; }; |
| |
| using sized_it = random_access_iterator<int*>; |
| static_assert( std::sized_sentinel_for<sized_it, sized_it>); |
| static_assert( std::sized_sentinel_for<std::reverse_iterator<sized_it>, std::reverse_iterator<sized_it>>); |
| static_assert( HasMinus<std::reverse_iterator<sized_it>>); |
| |
| // Check that `sized_sentinel_for` is false for `reverse_iterator`s if it is false for the underlying iterators. |
| using unsized_it = bidirectional_iterator<int*>; |
| static_assert(!std::sized_sentinel_for<unsized_it, unsized_it>); |
| static_assert(!std::sized_sentinel_for<std::reverse_iterator<unsized_it>, std::reverse_iterator<unsized_it>>); |
| static_assert(!HasMinus<std::reverse_iterator<unsized_it>>); |