From: Mark Wilson <mwilson13@...>
Date: 2003-08-07T08:27:48+09:00
Subject: Re: Why does Ruby have callcc?


On Wednesday, August 6, 2003, at 06:27 PM, Ben Giddings wrote:

> [snip]
> I found a bunch of websites all talking about continuations:
>
> http://www.ai.mit.edu/~gregs/ll1-discuss-archive-html/ 
> threads.html#01372
> http://www.ps.uni-sb.de/~duchier/python/continuations.html
> ...
> [snip]

First, I'm sure you know more about continuations than I do, because I  
haven't started to use them and only skimmed over discussions of them.

I found (as usual, I might add) that when trying to learn computer  
programming concepts, there's nothing quite like Scheme.*

Here's a discussion that quickly leads to programming examples:

http://www.cs.utexas.edu/users/wilson/schintro/schintro_75.html#SEC82

And here's another:

http://www.ccs.neu.edu/home/dorai/t-y-scheme/t-y-scheme-Z-H- 
15.html#node_sec_13.1

And a final one:

http://www.scheme.com/tspl2d/further.html#g1835

I know that I, for one, would be appreciative if you came up with a  
relatively straightforward way to explain callcc in Ruby.

Regards,

Mark

* This does not detract from my enthusiasm for Ruby -- studying Scheme  
helps me better understand Ruby, and computation in general.