From: MenTaLguY <mental@...>
Date: 2005-11-04T10:14:01+09:00
Subject: [ANN] lazy.rb

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I've got an 0.0 release of lazy.rb, an implementation of lazy evaluation
for Ruby, up here:

http://moonbase.rydia.net/software/lazy/

It provides two functions: promise (like R5 Scheme's delay) and force
(just as in Scheme).

promise takes a block to evaluate later; as an aid to circular
programming, the block's result is passed to it as a parameter.

force is used to force the value of a promised computation.

Some attempts have been made to support implicit forcing through the use
of SimpleDelegator, but with only mixed success so far.

-mental

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