[racket] begin vs +

I may think how call/cc should deal with delay's (call-by-need) is a moot point
(theory vs implementation).

Keiko

From: Matthias Felleisen <matthias at ccs.neu.edu>
Subject: Re: [racket] begin vs +
Date: Mon, 2 Aug 2010 10:00:39 -0400

> 
> call/cc captures the environment when it creates a procedural representation of the continuation, just like lambda. The two are doing more or less the same thing with two differences:  
> 
>  (1) lambda uses an explicit expression to create a procedure while call/cc uses an implicit expression (the current evaluation context); 
> 
>  (2) lambda create a mathematical abstraction if the expression avoids effects and call/cc introduces an effect into its procedure (abort). 
> 
> Note, a functional continuation creator (say F but NOT shift) avoids the second difference.