From: Logan Capaldo <logancapaldo@...>
Date: 2007-03-01T05:38:14+09:00
Subject: Re: Overload [] operator and use a block ?

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On 2/28/07, Robert Klemme <shortcutter@googlemail.com> wrote:
>
> On 28.02.2007 21:15, St=E9phane Wirtel wrote:
> > I would like to know if it's possible to overload the [] operator to
> > use a block with it.
> >
> > example:
> >
> > class Test
> >    def []( x )
> >        # to do something here
> >        yield if block_given?
> >    end
> > end
> >
> > t =3D Test.new
> > t['string'] do
> >     puts 'this is a test'
> > end
>
> AFAIK it's not because the syntax does not allow a block with []:
>
> irb(main):001:0> o=3DObject.new
> =3D> #<Object:0x7ff96dc8>
> irb(main):002:0> def o.[](x)
> irb(main):003:1> yield x
> irb(main):004:1> end
> =3D> nil
> irb(main):005:0> o[1] {|*a| p a}
> SyntaxError: compile error
> (irb):5: parse error, unexpected '{', expecting $
> o[1] {|*a| p a}
>        ^
>          from (irb):5
>          from :0
>
> Kind regards
>
>         robert


Yep.

You can however do
t.send(:[], 'string') do
   puts "This kind of defeats the purpose"
end

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