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Asked: 2026-05-15T11:25:00+00:00

I’m trying to implement a State Machine. The State Machine will have to have

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I’m trying to implement a State Machine. The State Machine will have to have an impact on the object that “HAS” it as a member.

However, I obviously can’t include the “StateMachine” in the “Game” class AND include the “Game” header in the “StateMachine” class.

How do I get around this problem?

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1 Answer

  1. Editorial Team

    As your client class is a member rather than an inheriting daughter, you can not access any private state of the parent (which I’m sure you knew), so you have a limited number of choices:

    • Expose some state in the parent publicly and diddle that (but this is poor design and should be avoided)
    • Give the parent a public notification interface of some kind and use that (better then the above, but still not great)
    • Pass a call-back to the client (a very c programmer type of solution)
    • Use some kind of signal/slots mechanism to notify the parent that something interesting has happened. If you’re using any of the big frameworks (Qt, etc…), this may already be available
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