| // { dg-do run { target c++20 } } |
| // Bug libstdc++/108487 |
| // ~20-30x slowdown in populating std::vector from std::ranges::iota_view |
| |
| #include <ranges> |
| #include <testsuite_hooks.h> |
| #include <testsuite_allocator.h> |
| |
| void |
| test_pr108487() |
| { |
| using __gnu_test::tracker_allocator; |
| using __gnu_test::tracker_allocator_counter; |
| auto r = std::ranges::iota_view{0, 20}; |
| tracker_allocator_counter::reset(); |
| std::vector<int, tracker_allocator<int>> v{r.begin(), r.end()}; |
| const std::size_t bytes = v.capacity() * sizeof(v.front()); |
| VERIFY( tracker_allocator_counter::get_allocation_count() == bytes ); |
| } |
| |
| int main() |
| { |
| test_pr108487(); |
| } |
