A fresh look at comparisons

[Scott S. McCoy]

I agree that's tricky, but isn't it infact true that opEquals is defined
as a multimethod? 

It appears to be, please follow this link: http://codepad.org/z09oUtB4

So maybe you would just like it to return bool, as opposed to int?  Or
maybe it needs better documentation?

Cheers,
	Scott S. McCoy

On Tue, 2008-04-15 at 07:49 +0100, Janice Caron wrote:
> 
> As you know, in existing D, opEquals(), at least for classes, is
> defined to take an Object parameter, not a C parameter, so even
> ignoring the inheritance rules, allowing opEquals to compare against
> multiple types is tricky. You end up writing code like
> 
>     int opEquals(Object o)
>     {
>         A a = cast(A)o;
>         B b = cast(B)o;
>         C c = cast(C)o;
> 
>         if (c !is null)
>         {
>             ...
>         }
>         else if (b !is null)
>         {
>             ...
>         }
>         else if (a !is null)
>         {
>             ...
>         }
>     }
> 
> which is not ideal
>