* All of a Junction map's member functions, together with its `Mutator` member functions, are atomic with respect to each other, so you can safely call them from any thread without mutual exclusion.
* If an `assign` [happens before](http://preshing.com/20130702/the-happens-before-relation/) a `get` with the same key, the `get` will return the value it inserted, except if another operation changes the value in between. Any [synchronizing operation](http://preshing.com/20130823/the-synchronizes-with-relation/) will establish this relationship.
* All of a Junction map's member functions, together with its `Mutator` member functions, are atomic with respect to each other, so you can safely call them from any thread without mutual exclusion.
* If an `assign` [happens before](http://preshing.com/20130702/the-happens-before-relation/) a `get` with the same key, the `get` will return the value it inserted, except if another operation changes the value in between. Any [synchronizing operation](http://preshing.com/20130823/the-synchronizes-with-relation/) will establish this relationship.