From: Gavin Sinclair <gsinclair@...>
Date: 2003-12-09T14:50:36+09:00
Subject: Re: Adjusting the Scope of Blocks

> Hi,
>
> Is there a way to give a block associated with a method call the same
> scope  as if it were executing inside the method.
>
> ie.
>
> class Foo
>    ACONST = 1
>
>    def input_flags
>         @FLAG_SEL = INPUT
>         yield
>    end
>
>    def output_flags
>         @FLAG_SEL = OUTPUT
>         yield
>    end
>
>    def set(flgs)
>         set_flags(@FLAG_SEL, flgs)
>    end
> end
>
> f = Foo.new
>
> f.input_flags {
>   set ACONST
> }
>
> f.output_flags {
>   set ACONST
> }


I've never done it myself, but you might try:

  class Foo
    def input_flags(&block)
      @FLAG_SEL = INPUT
      instance_eval &block
    end
  end

Gavin