Summary:
PushQueue with concurrent lock-free pushing, and single-threaded deletion. Iteration without modification can also be concurrent. Deletion should NOT be concurrent with iteration and other deletions, but can be concurrent with pushing.
There is no const iteraton at the moment, we can add it when necessary. Also I've not handled std::iterator_traits, might be fun getting into that :D
Reviewers: buda, dgleich, mislav.bradac
Reviewed By: dgleich
Subscribers: pullbot
Differential Revision: https://phabricator.memgraph.io/D420
