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Panke avatar Panke commented on September 22, 2024

I've managed to reduce it to UnrolledList!(RefCounted!(...)).

HashMap uses unrolled lists for buckets and will destroy them via typeid(bucket).destroy(&bucket)
while rehashing. Somehow the destructor for one RefCounted instance is called twice during
this, once explicitly via typeid(T).destroy(&item) and another time via allocator.dispose(previous).

    static struct E
    {
    }
    alias Element = RefCounted!(E, RefCountedAutoInitialize.no);
    UnrolledList!Element list;
    auto r = refCounted(E.init);
    Element.RefCountedStore.Impl* s = r._refCounted._store;
    list.insertAnywhere(r);
    typeid(list).destroy(&list);
    assert (s._count == 1);

This is from UnrolledList

	void clear()
	{
		Node* previous;
		Node* current = _front;
		while (current !is null)
		{
			previous = current;
			current = current.next;
			static if (!(is(T == class) || is(T == interface)))
				foreach (ref item; previous.items)
					typeid(T).destroy(&item); // FIRST destruction

			static if (useGC)
			{
				import core.memory: GC;
				GC.removeRange(previous);
			}
			allocator.dispose(previous); // SECOND destruction
		}
		_length = 0;
		_front = null;
		_back = null;
	}

from containers.

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