Avatar, or the player class, is derived from Creature class. Then many functions can be used by the Avatar, but sometimes or more like usually it needs a check if the Creature is the player and do something strictly limited to player character.
It's a perfectly valid option, because it can work without problems. Still, I wonder if it could be possible to use Creature class "component" of the Avatar without Creature knowing about the derived Avatar. I guess what is often done is a common class where both Creature and Avatar derive, but it seems a bit difficult to implement. You can also use more generic Creature functions that return information to Avatar class which then decides how to process the data or whatever.
It may sound like this is irrelevant in game programming, but I have noticed that when I improve OOP features of my source code it also becomes easier to understand for me. And sometimes the result contains improved gameplay features as well.
I'm also more experienced as programmer to handle that kind of thing now.
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