Type hint Java array of your own Java class
(defn foobar [#^MyClass[] myarray]) This syntax doesn't seem to work. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Type hint Java array of your own Java class
David Nolen a écrit : > (defn foobar [#^MyClass[] myarray]) > > This syntax doesn't seem to work. Indeed it's a bit tricky: #^"[Lyour.package.YourClass;" You can find it by doing: user=> (class (into-array [(your.package.YourClass.)])) [Lyour.package.YourClass; Christophe -- Professional: http://cgrand.net/ (fr) On Clojure: http://clj-me.blogspot.com/ (en) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Type hint Java array of your own Java class
Many thanks. On Wed, Feb 4, 2009 at 12:49 PM, Christophe Grand wrote: > > David Nolen a écrit : > > (defn foobar [#^MyClass[] myarray]) > > > > This syntax doesn't seem to work. > Indeed it's a bit tricky: > #^"[Lyour.package.YourClass;" > > You can find it by doing: > user=> (class (into-array [(your.package.YourClass.)])) > [Lyour.package.YourClass; > > Christophe > > -- > Professional: http://cgrand.net/ (fr) > On Clojure: http://clj-me.blogspot.com/ (en) > > > > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Type hint Java array of your own Java class
On Wed, Feb 4, 2009 at 12:49 PM, Christophe Grand wrote:
>
> David Nolen a écrit :
>> (defn foobar [#^MyClass[] myarray])
>>
>> This syntax doesn't seem to work.
> Indeed it's a bit tricky:
> #^"[Lyour.package.YourClass;"
>
> You can find it by doing:
> user=> (class (into-array [(your.package.YourClass.)]))
> [Lyour.package.YourClass;
Christophe, thanks for pointing the way. Sorry I kept going...
(defn array-of [cname]
(-> cname resolve .newInstance list into-array class .getName))
With that, you can:
(defn foobar [#^#=(array-of MyClass) myarray])
At least it appears to work:
user=> (meta #^#=(array-of String) [])
{:tag "[Ljava.lang.String;"}
Again, I apologize for even suggesting this.
--Chouser
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Re: Type hint Java array of your own Java class
Sorry for jumping in, but
"#^#=" doesn't make any sense to me. Where did this come from?
Chris
On Feb 4, 2:55 pm, Chouser wrote:
> On Wed, Feb 4, 2009 at 12:49 PM, Christophe Grand
> wrote:
>
> > David Nolen a écrit :
> >> (defn foobar [#^MyClass[] myarray])
>
> >> This syntax doesn't seem to work.
> > Indeed it's a bit tricky:
> > #^"[Lyour.package.YourClass;"
>
> > You can find it by doing:
> > user=> (class (into-array [(your.package.YourClass.)]))
> > [Lyour.package.YourClass;
>
> Christophe, thanks for pointing the way. Sorry I kept going...
>
> (defn array-of [cname]
> (-> cname resolve .newInstance list into-array class .getName))
>
> With that, you can:
>
> (defn foobar [#^#=(array-of MyClass) myarray])
>
> At least it appears to work:
>
> user=> (meta #^#=(array-of String) [])
> {:tag "[Ljava.lang.String;"}
>
> Again, I apologize for even suggesting this.
>
> --Chouser
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Re: Type hint Java array of your own Java class
On Wed, Feb 4, 2009 at 6:22 PM, chris wrote:
>
> "#^#=" doesn't make any sense to me. Where did this come from?
I already apologized twice, what more do you want from me!?
As penance, I will try to explain.
#^ is a reader macro, documented at http://clojure.org/reader
#= is another reader macro, largely undocumented, but discussed here:
http://groups.google.com/group/clojure/browse_thread/thread/7a24eeb982490a87/d579d881fea5b16d?#d579d881fea5b16d
>> user=> (meta #^#=(array-of String) [])
>> {:tag "[Ljava.lang.String;"}
The whole point of this example was to attach type-hint metadata to a
function arg, so the use of #^ was necessary. But usually #^ just
takes a literal symbol or map, and I wanted to use the results of a
function call, so I abused #= to do just that.
--Chouser
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Re: Type hint Java array of your own Java class
Chouser a écrit : > (defn foobar [#^#=(array-of MyClass) myarray]) > > Again, I apologize for even suggesting this Wow what a clever (ab)use of reader macros! -- Professional: http://cgrand.net/ (fr) On Clojure: http://clj-me.blogspot.com/ (en) --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: Type hint Java array of your own Java class
On Thu, Feb 5, 2009 at 7:33 AM, Christophe Grand wrote: > > Chouser a écrit : >> (defn foobar [#^#=(array-of MyClass) myarray]) >> >> Again, I apologize for even suggesting this > Wow what a clever (ab)use of reader macros! This is where a raptor jumps in from the left and eats someone :) > > -- > Professional: http://cgrand.net/ (fr) > On Clojure: http://clj-me.blogspot.com/ (en) > > > > > > -- Venlig hilsen / Kind regards, Christian Vest Hansen. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
