Use enum base type?

[Simen Kjaeraas]

On 2013-04-17, 19:15, Janissary wrote:

> Is it possible to evaluate an enum's base type? Ideally something like:
>
> enum somestrs : string { ... }
> enum d = 0.0;
> template EnumBaseType(E) if (is(E==enum)) { ... }
> unittest {
>     static assert( is(EnumBaseType!somestrs == string) );
>     static assert( is(EnumBaseType!d : float) );
>     static assert(!is(EnumBaseType!d == float) );
> }
>
> A template like this would make at least my life easier.

Whenever you want to do weird stuff with types, std.traits[1] should
be your #1 stop. And quite correctly, std.traits.OriginalType[2] does
what you want:

   enum E : int { a }
   typedef E F;
   typedef const F G;
   static assert(is(OriginalType!G == const int));

[1]: http://dlang.org/phobos/std_traits
[2]: http://dlang.org/phobos/std_traits#.OriginalType
-- 
Simen