A dictionary that keeps objects with the same key in a list and returns randomly one of them.
Part of MathLib, a diverse library of mathematical functions.
Put an object into the dictionary. If there is already an object at that key, the new object is added to the list of choices. If the object exists already somewhere in the set at a certain key, it is removed there.
Retrieve an object at a key. If there are several, one of them is chosen at random.
Remove an object from a certain key. If there are several of the same kind, only one is removed.
Remove an object from the set.
Replace an object by another one at the same key.
Choose a key from all possible keys, and then choose an object from it.
Iterate over all elements at a certain key.
Return the list of objects at a certain key.