Tassilo Horn <t...@gnu.org> writes:
> Phillip Lord <phillip.l...@newcastle.ac.uk> writes:
>
>> Is it because you're expansion returns the symbol and not the
>> function.
>>
>> ('inc 2)
>>
>> returns nil which is what I think is happening.
>
> Ah, indeed. I really whished that would throw an error. I mean, it's
> cool that keywords can lookup themselves in maps, but I don't think
> that's needed for symbols. At least I've never seen occurences of
>
> ('foo my-map)
> ('foo my-map ::default)
>
> in real code, and it's likely to shadow errors such as mine.
I'd agree. I have to admit I didn't know symbols implemented IFn -- in
fact, I looked up the code to make sure. I think that ('foo my-map) looks
fairly pathological and (get my-map 'foo) seems more likely. Although,
of course, you might do something like
(def x
{'symb 1})
(def foo
(let [x] (fn[y](y x))))
(foo 'symb)
But still a crash seems more sensible to me. I'd be interested if anyone
can show a sensible use for this.
> Anyway, using `resolve` works:
>
> (defmacro do-do [x afn]
> `(do ~((resolve afn) x)))
>
> Is that what one would use, or is there something better?
My solution involved "eval"; I think yours is better.
Phil
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