Returns the variable type to which the invoking IConversion object converts variable var.

This method must be implemented so that it copies the invoking object to the engine of the given copy manager using the copy manager.

This method is called when the object and all its sub-objects must be visited. To implement this method, you should first call the method ICopyableVisitor.BeginVisit() with yourself as parameter, then call ICopyableVisitor.VisitChild() for each sub-copyables, the call ICopyableVisitor.EndVisit() once again with yourself as parameter.