bimap: one to many

From: MM (finjulhich_at_[hidden])
Date: 2020-03-12 20:53:31

Hello
I want a collection to store a relationship N to M like so:

Item of type A                 Item of type B
A1                                    B1,B2,B3
A2                                    B4
A3                                    B1

and I would like a convenient way to get from a A instance to the list of B
instances, and vice versa, from a given B instance to the list of A
instances.

At runtime, the A objects are created first, then a list of B objects is
created.
Later, B objects get modified asynchronously and that modification need to
update the relevant A instances

what container to use?

boost::bimap< unordered_set<A*> ,  unordered_set<B*> >

?