Fujimoto Hisa
hisa****@fobj*****
Wed Mar 14 14:57:52 JST 2007
Hi Laurent
On 2007/03/14, at 9:23, Laurent Sansonetti wrote:
> Hi guys,
>
> I recently committed support for function-pointers arguments and
> return value of functions and methods. It means that you can now use
> them from RubyCocoa.
>
> How does it work? gen_bridge_metadata.rb has been modified to detect
> them and provide some additional XML markup. RubyCocoa at runtime
> detects the markup and will convert Ruby Proc objects into function-
> pointers, by creating an intermediate Libffi closure.
excellent!!
> Practically:
>
> $ irb -r osx/foundation
>>> include OSX
> => Object
>>> ary = NSMutableArray.alloc.init
> => #<OSX::NSCFArray:0x83d768 class='NSCFArray' id=0x125fd20>
>>> [5,3,2,4,1].each { |i| ary.addObject(i) }
> => [5, 3, 2, 4, 1]
>>> ary.sortUsingFunction_context(proc { |x, y, ctx| x.intValue <=>
> y.intValue }, nil)
> => nil
>>> ary.to_a.map { |x| x.to_i }
> => [1, 2, 3, 4, 5]
>
> Notes:
> - for functions/methods accepting only one function-pointer argument,
> we might want to accept a block directly (so,
> ``ary.sortUsingFunction_context(nil) { |x, y, ctx| ... }'').
It's absolutely necessary.
I can't think higher-order procedure *without block* for ruby
programming ;)
--
hisa