| //===----------------------------------------------------------------------===// |
| // |
| // 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 <class U> |
| // requires HasConstructor<Iter, const U&> |
| // constexpr reverse_iterator(const reverse_iterator<U> &u); |
| // |
| // constexpr in C++17 |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class It, class U> |
| void |
| test(U u) |
| { |
| const std::reverse_iterator<U> r2(u); |
| std::reverse_iterator<It> r1 = r2; |
| assert(r1.base() == u); |
| } |
| |
| struct Base {}; |
| struct Derived : Base {}; |
| |
| int main(int, char**) |
| { |
| Derived d; |
| |
| test<bidirectional_iterator<Base*> >(bidirectional_iterator<Derived*>(&d)); |
| test<random_access_iterator<const Base*> >(random_access_iterator<Derived*>(&d)); |
| test<Base*>(&d); |
| |
| #if TEST_STD_VER > 14 |
| { |
| constexpr const Derived *p = nullptr; |
| constexpr std::reverse_iterator<const Derived *> it1 = std::make_reverse_iterator(p); |
| constexpr std::reverse_iterator<const Base *> it2(it1); |
| static_assert(it2.base() == p); |
| } |
| #endif |
| |
| return 0; |
| } |