From: Joel VanderWerf <vjoel@...>
Date: 2005-03-07T10:54:46+09:00
Subject: Re: What is reason for callcc{|c|c}?

Luke Graham wrote:
> The block usually wants to return a useful value itself.
> 
> 
> On Mon, 7 Mar 2005 08:16:17 +0900, Joel VanderWerf
> <vjoel@path.berkeley.edu> wrote:
> 
>>Joel VanderWerf wrote:
>>
>>>2. So a result can be passed to the continuation.
>>
>>Duh. Of course you can do that with
>>
>>   c = callcc { |c| c }
>>
>>as the article says. The first time through, the value assigned to c
>>will be the continuation. The second time (after c.call(x)), the value
>>assigned to c will be arg x.


Just to clarify, this is how c can be assigned a return value other than 
the continuation:

   c = callcc { |c| c }
   p c
   c.call(3) if c.respond_to?(:call)

Output is:

#<Continuation:0xb7e51f84>
3