I'm a bit confused about the command pattern implementation.

In the 'input handler code snippet, the command binding is hinted at:

// Methods to bind commands...private:  Command* buttonX_;  Command* buttonY_;  Command* buttonA_;  Command* buttonB_;

I think here it would be helpful to show the actual code for the bindings. Because the purpose of the pattern is to enable the re-binding of buttons, it would be useful to show a binding and re-binding in the example.