Improving std.typecons.defineEnum

[Andrei Alexandrescu]

On 10/6/10 14:18 CDT, Tomek Sowiński wrote:
> I remember using defineEnum a few times. From user perspective you have enum names as
> strings that forms a nasty mixin, not to mention you can't Ddoc single enum values. It felt like
> stone age. Then I took a look at how it's implemented and saw a bunch of unreadable
> templates glueing together the content of an unholy string mixin.
>
> But instead of complaining I took time to devise something nicer:
>
> enum Eh { Ah, Oh, Uh }	// plain vanilla enum
> mixin EnumUtils!Eh;  // that's all you need, magic happens here
>
> assert (enumToString(Eh.Ah) == "Ah");
> assert (enumToString(cast(Eh)666) == null);
>
> Eh eh;
> assert (enumFromString("Oh", eh));
> assert (eh == Eh.Oh);
> assert (!enumFromString("Heh", eh));
>
>
> Do you want the EnumUtils template in Phobos?
> If so, how to contribute?

That's a good contribution, but I just deprecated enumToString in a 
recent commit because D's current introspection abilities made it easy 
to define parse and to!string to manipulate enum names.

I'll be looking forward to other goodies!


Andrei