From: Robert Klemme <bob.news@...>
Date: 2004-10-30T21:38:55+09:00
Subject: Re: reuse passed proc later?


"David Gurba" <blue_technx@lycos.com> schrieb im Newsbeitrag 
news:20041030005556.A499DCA06F@ws7-4.us4.outblaze.com...
> Hello Everyone,
>
> I'm new to Ruby and some of its features...
>
> I want to do the following (with as little modfication as necessary):
>
> call a passed block to a function at some later time...  Eg.
>
> class A
>
>  def foo(&block)
>    @func = block
>  end
> end
>
> a = A.new
> num = a.func.call { print "12" }
>
> ..but func is an unknown method, and attr_accessor :func doesn't help 
> either....

As David said, you don't invoke foo so you don't assign to @func.  You got 
the order a bit wrong since you provide the block too late, i.e. when you 
want to call it.  The smallest change to your example might be this

class A
  def foo(&block)
    @func = block
  end
end

a = A.new
num = a.foo { print "12" }.call


But you probably wanted

class A
  attr_reader :func
  def foo(&b) @func = b end
end

a = A.new
a.foo { puts "blah!" }
a.func.call

Kind regards

    robet