Classes as enums in D?

[Mike Parker via Digitalmars-d-learn]

On Monday, 30 November 2015 at 07:58:43 UTC, Andrew LaChance 
wrote:

>
> Oh interesting.  So you are saying I could have a struct 
> WhiteKey {...} and then an enum that extends WhiteKey?

enums can't *extend* anything. You can do this:

struct WhiteKeyS {
     immutable int halfStepsToPrevious;
     immutable int halfStepsToNext;
}

enum WhiteKey {
     A = WhiteKeyS(2, 2),
     B = WhiteKeyS(2, 1),
     C = WhiteKeyS(1, 2)
}

void main() {
     import std.stdio;
     writeln(WhiteKey.A.halfStepsToPrevious);
}