From: Charles Oliver Nutter <charles.nutter@...>
Date: 2007-11-24T10:38:41+09:00
Subject: Re: retry semantics changed

Wolfgang N��dasi-Donner wrote:
> If the wish is a way to evaluate lazy parameters, but not to evaluate 
> the receiver again (what can be more that confusing mit a Class and the 
> initialize method), that a possibility exists with Proc objects. Maybe 
> additional syntax for lazy evaluation (definition and execution) is more 
> sexy, but this...
> 
> def do_while(p)
>   yield while p[]
> end
> 
> i = 0
> do_while proc{i<10} do
>   puts i
>   i+=1
> end
> 
> ...works.

Quite right, and in this case the caller is explicitly accepting that 
the called method could very likely invoke the passed proc multiple 
times. Perfectly acceptable.

- Charlie