I'm using 1.9.0. Is this a behavior that recently changed?
On Mon, Jul 30, 2018 at 3:28 AM, Nicola Mometto <brobro...@gmail.com> wrote:
> Which version of clojure? This works fine in 1.10
>
> Clojure 1.10.0-master-SNAPSHOT
> user=> (set! *warn-on-reflection* true)
> true
> user=> (definterface Interface (test []))
> user.Interface
> user=> (def p (proxy [Object Interface] [] (test [] 1)))
> #'user/p
> user=> (defn get-test [o] (.test ^Interface o))
> #'user/get-test
> user=> (get-test p)
> 1
>
>
> On 30 Jul 2018, at 11:26, Mark Engelberg <mark.engelb...@gmail.com> wrote:
>
> Those fishy things were errors I made when simplifying and transcribing
> the proxy to post, but I have it correct in my own code.
>
> Here's a more precise, tested minimal example:
>
> (definterface Interface (test []))
> (def p (proxy [Object Interface] [] (test [] 1)))
> (defn get-test [o] (.test ^Interface o))
>
> => (get-test p)
> This throws an error that it can't cast the proxy to Interface.
>
> If you remove the ^Interface type hint, then get-test will work but will
> trigger reflection.
>
> Thanks for looking at this. It seems like it should work, but it doesn't.
>
>
> On Mon, Jul 30, 2018 at 3:06 AM, Nicola Mometto <brobro...@gmail.com>
> wrote:
>
>> That's exactly what you should do and it does work, e.g.:
>>
>> user=> (set! *warn-on-reflection* true)
>> true
>> user=> (.meta ^clojure.lang.IMeta (proxy [clojure.lang.IMeta] [] (meta []
>> {:a 1})))
>> {:a 1}
>>
>> In your small example you have two errors that might be fishy: a missing
>> arg vector to pass to the super ctor and an extra `this` parameter in the
>> method impl (proxy, unlike reify, is anaphoric and binds `this` for you)
>>
>>
>> On 30 Jul 2018, at 10:56, Mark Engelberg <mark.engelb...@gmail.com>
>> wrote:
>>
>> Let's say I have a proxy object:
>>
>> (def p (proxy [MyClass MyInterface] (interfaceMethod [this] ...)))
>>
>> Now, I want to call (.interfaceMethod p). How do I do this without
>> reflection?
>> I would have thought that (.interfaceMethod ^MyInterface p) would work,
>> but this results in an error message that this proxy object cannot be cast
>> to MyInterface.
>>
>>
>>
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>
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