Using an enum as an array index

Question

I have this enum:

enum ButtonState {
    BUTTON_NORMAL = 0,
    BUTTON_PRESSED = 1,
    BUTTON_CLICKED = 2
};

const u8 NUM_BUTTON_STATES = 3;

Answer 1

Question 1: I think it's good programming style. I use it all the time. Question 2: As far as I know, it is guaranteed to work that way, so you don't have to specify the values.

And I would put NUM_BUTTON_STATES into the enum as well.