On Feb 26, 4:17 am, Laurent PETIT <laurent.pe...@gmail.com> wrote:
> 2009/2/26 Konrad Hinsen <konrad.hin...@laposte.net>
>
>
>
>
>
> > On 26.02.2009, at 01:51, Rich Hickey wrote:
>
> > > You raise interesting issues and I'd like to explore them further. I'm
> > > not sure the issues you have with type-tag-or-class dispatch are all
> > > that prohibitive. In any case, I've added a type function that returns
> > > the :type metadata or the class if none:
>
> > Thanks, that helps a lot! With a built-in universal dispatching
> > function, most of my problems should be solved. Another useful
> > function to have would be
>
> > (defn type-instance?
> > "Evaluates x and tests if it is an instance of the type or class t.
> > Returns true or false"
> > [t x]
> > (identical? t (type x)))
>
> > for type-based dispatching inside a function.
>
> or maybe generalize the existing 'instance? function to the above definition
> ?
I'm not sure I'd want to do that. You'd still need actual class
detectors.
Rich
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