Ah, if only some one had implemented one.
I guess there is no reason NOT to implement this? It's still only a
single class, and single object per function? The class is going to be
longer, because method bodies like...
public Object invoke(Object arg1, Object arg2) {
return throwArity(2);
}
will get overridden with implementation, so I guess it *might* slow
start up time, and an AOT jar will get bigger.
So, the question is, did it just get forgotten or is it harder than it
looks?
Phil
Andy Fingerhut <[email protected]> writes:
> http://dev.clojure.org/jira/browse/CLJ-731 ?
>
> On Tue, Oct 28, 2014 at 2:39 AM, Phillip Lord <[email protected]>
> wrote:
>
>> Reid McKenzie <[email protected]> writes:
>> > This suggests that |apply| is immensely expensive in general,
>> > and that such arity unrolling even for trivial functions would be a good
>> > thing. Albeit hard to build.
>>
>>
>> Wonder whether it is macroable. Something like
>>
>>
>> (def new-function
>> (with-arities [20]
>> [args]
>> (blah args)
>> [args & rest]
>> (apply args rest)))
>>
>>
>> which gets replaced with
>>
>> (fn
>> ([]
>> (blah))
>> ([a]
>> (blah a))
>> ;;...etc
>> ([a...t]
>> (blah a...t))
>> ([a...t & rest]
>> (apply blah a...t rest)))
>>
>>
>> Where a...t are the symbols a to t. Would this help? The function blah,
>> of course, would know what it's arity is, but this is true for most
>> higher-order functions (if functions returned their arities, I guess you
>> could work around this, but they don't).
>>
>> So, partial would become something like...
>>
>> (def partial
>> (with-arities [:all]
>> [args]
>> (fn [args] (args))
>> [args & rest]
>> (fn [& rst] (apply (list* args rst)))))
>>
>>
>> Just thinking aloud!
>>
>> Phil
>>
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