Re: Defining some stuff for each class in turn

[Andrei Alexandrescu]

Phil Deets wrote:
On Thu, 01 Oct 2009 12:53:46 -0500, Andrei Alexandrescu 
<seewebsiteforem...@erdani.org> wrote:

interface Comparator(T)
{
     int opCmp(Comparator!T rhs);
     mixin(Impl) // for each implementation Impl
     {
         int opCmp(Impl rhs);
         override int opCmp(Comparator!T rhs)
         {
             return opCmp(cast(Impl) rhs);
         }
     }
}


I like that you can use this in interfaces too. It seems to allow for 
something similar to multiple inheritance, but presumably without the 
implementation difficulty.

Phil Deets

That's a great point. To compare this feature with Scala's mixins (which 
I studied and now feel are a good feature), my understanding is that 
Scala mixins are an interface plus a default implementation. The feature 
proposed above is an interface with a prescribed implementation. That 
way, Scala mixins seem to be somewhat more flexible.

Andrei