Follow-up Comment #6, patch #1020 (project wesnoth):
I am glad to see someone tackle this idea finally.
Unfortunately, you missed the most important part of the proposal: throwing a
unit_map_iterator_invalid exception when someone tries to access an invalid
unit iterator.
Another big head-scratcher is why you are keeping a revision number if you
don't use it to avoid unnecessary work in find_pair()?
As an extension to this idea, it would be nice to add support for
unit_map_observers who get notified when a refresh (a.k.a. find_pair with new
revision number) occurs.
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