From: James Edward Gray II <james@...>
Date: 2004-12-24T04:18:55+09:00
Subject: SimpleDelegate (was Re: Inconsistency with IO.readlines)

Let me apologize in advance, because I've not bee following this 
thread.  I have been working with Gavin Sinclair to document 
delegate.rb though, and together we've been hard pressed to find a 
single good use for SimpleDelegate...

On Dec 23, 2004, at 1:03 PM, Matt Maycock wrote:

> # ========== ext/input_reader.rb ==========
> # ext/input_reader.rb
> # accept some name argument.  if name is nil || '-',
> #   then use $stdin and send that to the block
> #   otherwise, use File.open(name, *restargs)
>
> require 'delegate'
>
> def input_reader(fname, *fargs)
>   block = Proc.new {|source|
>     getter = SimpleDelegator.new(source)
>     yield getter
>     getter.__setobj__(nil)
>   }
>
>   if fname.nil? || fname == '-' then
>     block[$stdin]
>   else
>     File.open(fname, *fargs) {|f| block[f]}
>   end
> end

Would you mind explaining to me why you use SimpleDelegate above?  I 
would really appreciate it.

James Edward Gray II