From: "Anders Engström" <aengstrom@...>
Date: 2004-11-25T17:48:34+09:00
Subject: Re: proc to method

On Thu, Nov 25, 2004 at 05:27:58PM +0900, Robert Klemme wrote:
> 
> "Anders Engstr�m" <aengstrom@gnejs.net> schrieb im Newsbeitrag
> news:20041125073108.GA25131@metamorph.gnejs.net...
> > On Thu, Nov 25, 2004 at 04:18:04PM +0900, itsme213 wrote:
> > > I have some closure context captured in a proc, and want to create a
> method
> > > on a class from that. What is a good way to do this?
> > >
> >
> > Something like the following should work:
> >
> >     class Test
> >         # The class to add the method to.
> >     end
> >
> >     # The proc we want to turn into a method
> >     block = proc {|arg|
> >         puts "Proc got #{arg}"
> >     }
> >
> >     # Define the method
> >     Test.__send__(:define_method, :run_proc, &block)
> 
> Alternatively:
> 
> Test.instance_eval { define_method(:run_proc, &block) }
> 
> >     # Make it public
> >     Test.__send__(:public, :run_proc)
> 
> I think that's not necessary as methods are public by default.
> 

I didn't think that either... but when I ran the code without the
'publification call' I got:

proc_to_meth.rb:13: private method `run_proc' called for
#<Test:0x40120ca0> (NoMethodError)

This is on 
    
Linux metamorph 2.6.6 #1 Mon May 31 12:59:53 CEST 2004 i686 GNU/Linux
ruby 1.8.2 (2004-11-03) [i386-linux]

//Anders

-- 
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. Anders Engstr�m         aengstrom@gnejs.net
. http://www.gnejs.net    PGP-Key: ED010E7F
. [Your mind is like an umbrella. It doesn't work unless you open it.]