| //===----------------------------------------------------------------------===// |
| // |
| // 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_view() requires default_initializable<V> = default; |
| |
| #include <ranges> |
| #include <cassert> |
| |
| #include "types.h" |
| |
| enum CtorKind { DefaultCtor, PtrCtor }; |
| template<CtorKind CK> |
| struct BidirRangeWith : std::ranges::view_base { |
| int *ptr_ = nullptr; |
| |
| constexpr BidirRangeWith() requires (CK == DefaultCtor) = default; |
| constexpr BidirRangeWith(int *ptr); |
| |
| constexpr bidirectional_iterator<int*> begin() { return bidirectional_iterator<int*>{ptr_}; } |
| constexpr bidirectional_iterator<const int*> begin() const { return bidirectional_iterator<const int*>{ptr_}; } |
| constexpr bidirectional_iterator<int*> end() { return bidirectional_iterator<int*>{ptr_ + 8}; } |
| constexpr bidirectional_iterator<const int*> end() const { return bidirectional_iterator<const int*>{ptr_ + 8}; } |
| }; |
| |
| constexpr bool test() { |
| { |
| static_assert( std::default_initializable<std::ranges::reverse_view<BidirRangeWith<DefaultCtor>>>); |
| static_assert(!std::default_initializable<std::ranges::reverse_view<BidirRangeWith<PtrCtor>>>); |
| } |
| |
| { |
| std::ranges::reverse_view<BidirRangeWith<DefaultCtor>> rev; |
| assert(rev.base().ptr_ == nullptr); |
| } |
| { |
| const std::ranges::reverse_view<BidirRangeWith<DefaultCtor>> rev; |
| assert(rev.base().ptr_ == nullptr); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |
| |