opCmp, opEquals

[Stewart Gordon]

"bearophile" <bearophileHUGS at lycos.com> wrote in message 
news:gdq3pq$126t$1 at digitalmars.com...
>I have a small question regarding OOP design. The signature of opCmp, 
>opEquals when defined inside classes require a Object argument.
> So you have to define what to do when the given object can't be cast to 
> the this class. Here you can see two alternative designs:
<snip>
> Someone told me that Java uses a mixed approach: the opEquals returns 
> false when the cast is not possible, while the cmp throws an exception.

This seems sensible to me.  If two objects are of completely different 
classes, obviously they aren't equal to each other.  But there's no means by 
which one can be picked out as being 'less than' the other.

Stewart.

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