From: "Erik Bågfors" <erik@...>
Date: 2002-03-13T00:02:02+09:00
Subject: Re: write a stream to another

On Tue, 2002-03-12 at 15:24, Matt Armstrong wrote:
> Thomas S�ndergaard <tsondergaard@speakanet.com> writes:
> 
> >> > I would probably just use:
> >> 
> >> [...]
> >> 
> >> >   istream.each { |line|
> >> >       ostream.write line
> >> >   }
> >> 
> >> Agreed.  Or a bit more efficient:
> >> 
> >> while buf = istream.read(4096)
> >>   ostream.write(buf)
> >> end
> >
> > You're not thinking declaratively ;-) I want to say what I want it
> > to do. Not how to do it.
> >
> > ostream << istream
> >
> > seems about right to me.
> 
> Sure, you're talking API and I'm talking implementation.  Your IO#<<
> could be implemented with the while loop.

I just had to try this...

class IO
  alias :origstuff :<<
  
  def << (anObject)
    if anObject.kind_of? IO
      while buf = anObject.read(4096)
        self.write(buf)
      end
    else
      origstuff(anObject)
    end
  end
end

f = File.open('/etc/passwd')
t = File.open('/tmp/passwd', 'w')

t << f
t << "test\n"

works fine..


/Erik

-- 
Erik B�gfors               | erik@bagfors.nu
Supporter of free software | GSM +46 733 279 273
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