From: Daniel N <has.sox@...>
Date: 2006-07-29T09:56:44+09:00
Subject: Re: What to use binding for?

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On 7/28/06, Tom Werner <tom@helmetstohardhats.org> wrote:
>
> Gene Tani wrote:
> > Daniel N wrote:
> >
> >> Hi everyone,
> >>
> >> There was a post a couple of days ago that included a call to binding
> >>
> >> I was interested in this and went to look up the binding docs.  All
> good, it
> >> seems simple enough, but I can't think of how to use it.
> >>
> >> Could anyone provide a simple explaination/code of an example of how it
> >> might be used.
> >>
> >>
> > Google say:
> >
> > http://extensions.rubyforge.org/rdoc/classes/Binding.html
> >
> http://groups.google.com/group/comp.lang.ruby/browse_frm/thread/1d08d0cdb3b53d11
> >
> > http://onestepback.org/index.cgi/Tech/Ruby/RubyBindings.rdoc/style/print
> >
>
> Looking at Jim Weirich's article on writing a local variable swap method
> using binding, I couldn't help but think that the following would reduce
> code size, complexity, and call keystrokes in the final embodiment of
> the method:
>
> def swap(a, b, bind)
>     eval "#{a}, #{b} = #{b}, #{a}", bind
> end

a = Object.new     #=> #<Object:0x2c64540>
> b = Object.new     #=> #<Object:0x2c617c8>
>
> swap(:a, :b, binding)
>
> a     #=> #<Object:0x2c617c8>
> b     #=> #<Object:0x2c64540>
>
> Not that I have any delusions about this pedagogical method having any
> relevance in the real world, but there it is just the same.
>
> Tom
>
> --
> Tom Werner
> Helmets to Hardhats
> Software Developer
> tom@helmetstohardhats.org
> www.helmetstohardhats.org
>
>
> Thanx guys.  This has helped me see how to use binding.  Although I'm
still not sure when to use it :)

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