From: Robert Klemme <bob.news@...>
Date: 2004-04-19T22:04:08+09:00
Subject: Re: convert yield to proc


"Simon Strandgaard" <neoneye@adslhome.dk> schrieb im Newsbeitrag
news:pan.2004.04.19.11.00.15.63416@adslhome.dk...
> On Mon, 19 Apr 2004 13:51:00 +0200, Simon Strandgaard wrote:
> > On Mon, 19 Apr 2004 20:42:58 +0900, ts wrote:
> >>
> >
> > Bommer.. your right.  I thought I was on to something.
> >
> >
> > Any idea how to do this?
>
>
> Just realized that my knowledge about &block is flawed!
>
> server> ruby a.rb
> before
> after
> before
> middle
> after
> server> expand -t2 a.rb
> def m(&block)
>   puts "before"
>   if block_given?
>     block.call
>   end
>   puts "after"
> end
>
> m
>
> m do
>   puts "middle"
> end
> server>

Even simpler:

def foo(&bl)
  bl.call(whatever) if bl
end

def bar(&bl)
  foo(&bl)
end

# or

def foo
  yield whatever
end

def bar(&bl)
  if bl
    foo &bl
  else
    foo() {}
  end
end

Regards

    robert