Are there any observable Qt container classes?

I'm looking for general-purpose container/collection classes (e.g., lists, maps) that emit Qt signals when items are added or removed.

I know the standard Qt container classes don't do it. Anyone know of any OSS library that has observable containers?

I realize there are issues with templates and Qt features. If it were easy, I'd just do it myself instead of looking for an existing one. :)

Thanks.