| // { dg-options "-std=gnu++20" } |
| // { dg-do compile { target c++20 } } |
| |
| #include <iterator> |
| |
| struct movable_iterator |
| { |
| using difference_type = long; |
| |
| movable_iterator() = default; |
| movable_iterator(movable_iterator&&) = default; |
| movable_iterator& operator=(movable_iterator&&) = default; |
| |
| int operator*() const { return 1; } |
| |
| movable_iterator& operator++() { return *this; } |
| void operator++(int) { } |
| |
| bool operator==(const movable_iterator&) const = default; |
| }; |
| |
| using namespace std; |
| |
| constexpr counted_iterator<movable_iterator> it({}, 3); |
| |
| static_assert( sized_sentinel_for<std::default_sentinel_t, counted_iterator<movable_iterator>> ); |
| // LWG 3392 |
| // ranges::distance() cannot be used on a move-only iterator |
| // with a sized sentinel |
| static_assert( ranges::distance(it, default_sentinel) == 3 ); |
