From: John Carter <john.carter@...>
Date: 2005-03-07T07:48:36+09:00
Subject: What is reason for callcc{|c|c}?

The excellent article in callcc at
http://www.all-thing.net/Ruby/iterators_generators_and_continuations_in_ruby.html

makes the following statement...

   The way to create a continuation is with Kernel#callcc. For what I
   imagine are historical reasons, the continuation is passed as an
   argument to a block, rather than returned directly. So the idiom to get
   a continuation at the current point in the code is this:

      c = callcc { |c| c }

Can anyone elaborate on this history?

Or is there a deeper reason than mere history?

Because I find it very confusing.

Thanks


John Carter                             Phone : (64)(3) 358 6639
Tait Electronics                        Fax   : (64)(3) 359 4632
PO Box 1645 Christchurch                Email : john.carter@tait.co.nz
New Zealand

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