From: dblack@...
Date: 2003-05-08T23:03:17+09:00
Subject: Re: [Q] Block passing: obj.new(){block}

Hi --

On Thu, 8 May 2003, Peter Schrammel wrote:

> Hi,
>
> How do I pass a block to the initialize method that calls some methods
> of the new object? Here is what I want to get:
>
> class Test
>    def initialize(foo)
>    ...
>    end
>    def set=(myval)
>      @set=myval
>    end
>    def set
>      @set
>    end
> end
>
> t=Test.new("foo"){set=89}
> puts t.set
> =>89

You're going to need to state the receiver explicitly for that call to
set (because otherwise Ruby will favor the interpretation that it's a
local variable assignment).  So, you might end up with something like:

  class Test
    attr_accessor :set       # save some typing :-)
    def initialize(foo)
      yield(self)
    end
  end

  t=Test.new("foo") {|o| o.set=89}
  puts t.set

Are you sure you wouldn't rather do:

  t = Test.new("foo")
  t.set(89)

? :-)


David

-- 
David Alan Black
home: dblack@superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav