From: Peter Ertl <pertl@...>
Date: 2006-03-24T23:28:52+09:00
Subject: Re: iterator class not working

aargh, again...

remove that line, please:

> raise "done" if @done

> --- Urspr�ngliche Nachricht ---
> Von: "Peter Ertl" <pertl@gmx.org>
> An: ruby-talk@ruby-lang.org (ruby-talk ML)
> Betreff: Re: iterator class not working
> Datum: Fri, 24 Mar 2006 23:25:59 +0900
> 
> Thanks for all you help.
> 
> Finally, using two nested continuations works well...
> 
> Here's my working code ... I am very curious about 
> optimization and alternatives from you guts. Afterall 
> I found this issue a very exciting one!!
> 
> class Iterator
> 
>   def initialize(obj, method = :each)
>     @obj = obj
>     @method = method
>   end
> 
>   def next
>     raise "done" if @done
>     @iteration.call if @iteration
>     @iteration, @current = callcc do |loop|
>       @obj.send(@method) do |item|
>         callcc do |state|
>           loop.call state, item
>         end
>       end
>       nil
>     end
>     @current
>   end
> 
> end
> 
> names = %w{peter paul mary gordy john jane elwood}
> 
> it = Iterator.new(names)
> while item = it.next
>   puts item
> end
> 
> it = Iterator.new("Teststring", :each_byte)
> while item = it.next
>   puts item.chr
> end
> 
> 
> peter
> paul
> mary
> gordy
> john
> jane
> elwood
> T
> e
> s
> t
> s
> t
> r
> i
> n
> g
> 
> 
> > --- Urspr�ngliche Nachricht ---
> > Von: Ross Bamford <rossrt@roscopeco.co.uk>
> > An: ruby-talk@ruby-lang.org (ruby-talk ML)
> > Betreff: Re: iterator class not working
> > Datum: Fri, 24 Mar 2006 23:10:05 +0900
> > 
> > Just a small fix:
> > 
> > On Fri, 2006-03-24 at 22:49 +0900, Ross Bamford wrote:
> > >   def initialize(enum)
> > >     @yield = lambda do
> > >       enum.each do |item|
> > > -       @yield = callcc { |cc|
> >   +       callcc { |cc|
> > >           @next.call cc, item
> > >         }
> > >       end
> > >       raise "Exhausted"
> > >     end
> > >   end
> > 
> > Doesn't really hurt (as currently written) but it's unnecessary and
> > could cause confusion.
> > 
> > -- 
> > Ross Bamford - rosco@roscopeco.REMOVE.co.uk
> > 
> > 
>