This would work if I knew the type of the function arguments. It doesn't
seem to work when type-hinting on the constructor call.
On Wednesday, 4 December 2013 22:31:53 UTC+2, James Reeves wrote:
>
> Try something like:
>
> (let [x (with-meta (gen-sym) {:tag String}]
> (defn foo [~x] ...))
>
> - James
>
>
> On 4 December 2013 19:55, dm3 <[email protected] <javascript:>> wrote:
>
>> Hello,
>>
>> I've been having a little problem when trying to generate java interop
>> code and avoid reflection warnings. I have to generate a bunch of
>> functions which delegate to java constructors, like this:
>>
>> (defn mk-a [x y z] (A. x y z))
>> (defn mk-b [x y z] (B. x y z))
>>
>> The main reason here is to be able to `apply` the functions to lists of
>> arguments, as java constructors cannot be applied (AFAIK, would be great if
>> I'm wrong - would solve a lot of my problems!).
>>
>> The problem is - java constructors are overloaded:
>>
>> A(String x, int y, int z)
>> A(BigDecimal x, String y, int z)
>> ...
>>
>> I was trying to generate such functions in my top-level form, like this:
>>
>> (doseq [[java-ctor fn-name] [['A. 'mk-a] [B'. 'mk-b]]
>> (eval `(defn ~fn-name [x# y# z#]
>> (cond (string? x#)
>> (~java-ctor ^String x# y# z#)
>>
>> (string? y#)
>> (~java-ctor x# ^String y# z#))))
>>
>> Which still generates reflection warnings as type hints are read by the
>> reader and applied to the forms read by the eval, not the result of the
>> eval itself (please, correct me if I'm wrong here).
>>
>> I have a suspicion that the way I'm approaching the problem is wrong :)
>> How should I go around solving this problem?
>>
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