[MacRuby-devel] Monkey patching Objective-C classes

[Jeremy Voorhis]

I've reproduced it using 0.4, for whatever that's worth. If you open a
builtin class (e.g. NSSet) with the class keyword, the object_id changes. If
you open it with class_eval, the object_id is unchanged.
Best,

Jeremy

On Fri, Aug 21, 2009 at 11:47 AM, Laurent Sansonetti
<lsansonetti at apple.com>wrote:

> On Aug 21, 2009, at 9:33 AM, Clay Bridges wrote:
>
>  I'm using MacRuby to test some of my ObjC classes. I was wondering if
>> there was a canonical way to monkey patch these classes.
>>
>
> Just open them as you would do in Ruby.
>
>
>  Consider, the following where Cell is an ObjC class:
>>
>> irb(main):001:0> Cell.object_id
>> => 4387749088
>> irb(main):002:0> class Cell
>> irb(main):003:1>   def whee
>> irb(main):004:2>     p 'whee'
>> irb(main):005:2>   end
>> irb(main):006:1> end
>> => nil
>> irb(main):007:0> Cell.object_id
>> => 4388625216
>>
>> I would expect the object_id to stay the same, e.g. using pure MacRuby:
>>
>> irb(main):010:0> class Bar
>> irb(main):011:1> end
>> => nil
>> irb(main):012:0> Bar.object_id
>> => 4298834304
>> irb(main):013:0> class Bar
>> irb(main):014:1>   def drink
>> irb(main):015:2>     p 'tasty!'
>> irb(main):016:2>   end
>> irb(main):017:1> end
>> => nil
>> irb(main):018:0>  Bar.object_id
>> => 4298834304
>>
>
> It's indeed strange. I can't reproduce this on the command-line using
> NSPredicate.
>
> $ ./miniruby -e "p NSPredicate.object_id; class NSPredicate; def hey;end;
> end; p NSPredicate.object_id"
> 140735073102888
> 140735073102888
>
> Normally the class shouldn't change if it's just re-opened.
>
> Do you see the #whee method in Objective-C land once you patch it from
> Ruby?
>
> Laurent
>
> _______________________________________________
> MacRuby-devel mailing list
> MacRuby-devel at lists.macosforge.org
> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.macosforge.org/pipermail/macruby-devel/attachments/20090821/b8dfc676/attachment.html>