From: "Jonas Bülow" <j@...>
Date: 2002-07-27T17:52:21+09:00
Subject: Re: Call-by-need and/or Delayed Evaluation

Hi,

John wrote:
> 
> "Reginald Braithwaite-Lee" <raganwald@yahoo.com> wrote in message
> news:243c635a.0207261955.54ae0bf@posting.google.com...
> > Hello:
> >
> > Has there been any work on using Ruby's closures to implement
> > call-by-need semantics, such as the freeze and thaw or delay and force
> > macros in Lisp?
> >
> > I'm especially interested in implementations of the Streams mentioned
> > in Abelson amd Sussman's "Structure and Interpretation of Computer
> > Programs"
> >
> > Thanks!
> >
> > In shallow waters, shrimps make fools of dragons. - Chinese Proverb
> 
> Would it be possible to give pointers to information on the web for this
> Streams idea, or perhaps give us an overview?  I am intrigued as to what
> they are.

The book is online. The chapter about streams is found at:

http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-24.html#%_sec_3.5

And the complete book (great book!): is found at:

http://www-mitpress.mit.edu/sicp/

Regards



> 
> Thanks
> 
> John.