From: Zsban Ambrus <ambrus@...>
Date: 2004-05-03T19:06:10+09:00
Subject: Re: Why no Proc##[]=() ? Why no Proc##replace() ?

On Mon, May 03, 2004 at 01:45:45PM +0900, Jean-Hugues ROBERT wrote:
> 
> Hum... OK. I am wrong. How can I have a block variable that survives
> multiple across multiple invocation ?
> 
> I had tried with a local variable, but that did not work. So I tried
> with an instance variable, and it seemed to work (but does not,
> because I was wrong assuming self was the Proc object, whereas in fact
> it is the enclosing method's self, which makes sense BTW).
> 
> BTW: Where can I save the result of long_method, if neither in a
> class variable, nor in a local variable ?

You don't.  A proc is just a simple lambda without mutable internal state.
If you want a proc-like object that can have mutable internal state, 
define a class and define its [] method.  That's simpler. 

Ok, it is possible with lambdas too, but I'm not sure how exactly.

> 
> Is there such a thing that "current_block()" or whatever method
> that tells me what the Proc object is ?
> 
> I guess my example with self.replace { mutated_block } was wrong too
> (it was not supposed to work anyways because replace is not there
> for Proc/s). So... How can a block remember things ?
> 
> Yours,
> 
> Jean-Hugues
>