Re: How to enum an enum?

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Date: Thu, 13 Nov 2003 02:19:17 GMT

"Ernst Murnleitner" <mur-spam@awite.de> wrote...
> I want to enumerate all values in an enum, e.g.:
> {
> enum Family{A=0, B,C, D = 100, E};
>
> BaseItem * p = Factory::Get...// BaseItem is the basis of many other items
> // BaseItem has a virtual Function IsA(f) which tests if the item is
member
> of Family f.
>
> int iNum = 0;
> for(Family e = A; e <= E, e++) // but this does not work, of course

 for(Family e = A; e <= E; e++) // will work if you define
                               // operator++(int) for 'Family'
                              // and replace the , with a ;

> if(p->IsA(e))
> iNum ++;
> cout << "Item is Member of " << iNum << " families" << endl;
> }
>
>
> It seems not to be possible? Is there another elegant solution

Family operator++(Family f, int) {
    if (f == C)
        return D;
    else if (f == E)
        return A; // or not -- this is a wrapping increase
    else
        return Family(f + 1);
}

should do it...

Victor

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