Returns rwnil if there is no such element. Returns rwnil if there is no such element. Returns the number of items removed. Returns the number of items removed. Changes the capacity of self by creating a new hashed multi-set with a capacity of sz .
Self is replaced by the result.
Self is replaced by the result. Saves the collection coll onto the output stream strm , or a reference to it if it has already been saved. If a collection is created off the heap, then you are responsible for deleting it.