Glad it works :-)
The reason why your example doesn't work is because in MacRuby, String descends
from NSString, which is a Foundation object. Foundation objects use "init" and
not "initalize", and for syntaxic sugar reasons, #new is aliased to [[obj
alloc] init] on Foundation objects :-).
$> macirb --simple-prompt
>> class A < String
>> def initialize
>> super
>> puts "initialize"
>> end
>> def init
>> if super
>> puts "init"
>> self
>> end
>> end
>> end
=> nil
>> A.new
init
=> ""
On non-Foundation objects, #new behaves as you expect (the ruby way)
$> macirb --simple-prompt
>> class A < Range
>> def initialize(a, b)
>> super
>> puts "range initialize!"
>> end
>> end
=> nil
>> A.new(1, 2)
range initialize!
=> 1..2
I agree this difference can be confusing, and I think it could find its place
in a certain book *stares at Matt*
--
Thibault Martin-Lagardette
On May 6, 2010, at 20:51, russell muetzelfeldt wrote:
>> From: Thibault Martin-Lagardette <thibault...@gmail.com>
>>
>> What you can do is a "factory" just like this:
>>
> ...
>
>> You can also do a more Cocoa-ish way:
>>
> ...
>
>> Hope that helps!
>
> yep, that all works... I'd rather be doing it in a more Ruby-ish way
> though... :)
>
>
> Is the fact that the Ruby-standard initialize method is not called for Ruby
> classes descended from Obj-C classes expected? To me, at least, it violates
> the principle of least surprise...
>
> for example, in ruby 1.9.1 we see initialize being called
>
> ru...@worcestershire:~$ irb1.9.1
> irb(main):001:0> class C2 < String
> irb(main):002:1> attr_accessor :foo
> irb(main):003:1> def initialize foo = "default2"
> irb(main):004:2> @foo = foo
> irb(main):005:2> STDERR.puts "setting #{foo}"
> irb(main):006:2> end
> irb(main):007:1> end
> => nil
> irb(main):008:0> c2 = C2.new
> setting default2
> => ""
> irb(main):009:0>
>
>
> but not in macruby 0.6
>
> ru...@alcazar:~$ macirb
> irb(main):001:0> class C2 < String
> irb(main):002:1> attr_accessor :foo
> irb(main):003:1> def initialize foo = "default2"
> irb(main):004:2> @foo = foo
> irb(main):005:2> STDERR.puts "setting #{foo}"
> irb(main):006:2> end
> irb(main):007:1> end
> => nil
> irb(main):008:0> c2 = C2.new
> => ""
> irb(main):009:0>
>
>
> _______________________________________________
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> MacRuby-devel@lists.macosforge.org
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