From: Bill Clagett <bill@32768.com>
Date: 2002-09-21T09:51:16+09:00
Subject: Re: Creating a method given a block

Uh. No. Don't do that. I should pay attention to those alarms going off in
the back of my head.

Nothing's stopping the block from being gc'd.

bill

----- Original Message -----
From: "Bill Clagett" <bill@32768.com>
To: <ruby-talk@ruby-lang.org>
Sent: Friday, September 20, 2002 5:37 PM
Subject: Re: Creating a method given a block


> Sort of scary, but you could abuse ids:
>
> class Foo
>   def build x, y, z, sym, &block
>     instance_eval "
>       class << self
>         def #{sym.id2name}
>           ObjectSpace._id2ref(#{block.id}).call
>         end
>       end
>     "
>   end
> end
>
> a = Foo.new
> a.build(1, 2, 3, :spam) { puts "printed from a block"}
> a.spam
>
> ----- Original Message -----
> From: "Hal E. Fulton" <hal9000@hypermetrics.com>
> To: "ruby-talk ML" <ruby-talk@ruby-lang.org>
> Sent: Friday, September 20, 2002 5:00 PM
> Subject: Creating a method given a block
>
>
> > Suppose I have a method 'build' to which I am passing
> > (among other things) a Symbol and a block.
> >
> > The build method will define a method of the given
> > name and the block will in effect be the "body"
> > of that block.
> >
> > I've been messing with Procs trying to get this to
> > work. Just can't figure it out.
> >
> > Don't say "define_method" because I'm 1.6-compatible.
> > Don't know how that one works anyway.
> >
> > For the visual thinkers:
> >
> >   def build(a, b, c, sym, &block)
> >     #...
> >     # Could use eval to define method
> >     # referred to by 'sym'... but how
> >     # to get it to call the block??
> >   end
> >
> >   build(x, y, z, :get_busy) { do_stuff(); do_some_more() }
> >
> > Just curious.
> >
> > Hal
> >
> >
>