From: "Peña, Botp" <botp@...>
Date: 2002-11-15T10:38:25+09:00
Subject: Re: Product with filters

cool.
Have you added this to the Rubygarden wiki? ...preferably under algorithms?

> martindemello@yahoo.com [mailto:martindemello@yahoo.com] said:
> ....
> # A modification of Joel VanderWerf's 
> EnumerableOperator#product to include 
> # restrictions ('select' style filters that are applied as 
> the product is # constructed). Behaviour defaults to the 
> Cartesian product when no filters are # given. (List 
> comprehension envy again <g>) # 
> # The argument list consists of a mixture of factors 
> (Enumerable objects) # and restrictions (procs returning a boolean). 
> #
> # Factors appear in order; restrictions are sorted by arity, 
> so that a # restriction of arity n is applied after the nth 
> element in every tuple is # added.
> 

[snipped code]