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IWETHEY Home / IWETHEY Board / Theory and Practice of Programming Forum / In the spirit of net
Post #115,697
by Arkadiy
Picture of Arkadiy
8/28/03 2:01:55 PM
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New In the spirit of net
What other contexts are known to a given context? In the stack model, a frame knows its parent, and that's all. What other connections are set up?
--

Less Is More. In my book, About Face, I introduce over 50 powerful design axioms. This is one of them.

--Alan Cooper. The Inmates Are Running the Asylum
Post #115,710
by JimWeirich
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8/28/03 3:49:01 PM
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New Re: In the spirit of net
What other connections are set up?

When a closure is created, any variables in the local scope that are referenced by the closure must exist for the life of the closure. For example (Ruby follows) ...
  def make_counter\n    n = 0\n    proc { n += 1; n }\n  end\n\n  c = make_counter\n\n  p c.call   # => 1\n  p c.call   # => 2
The context containing "n" must be kept around after "make_counter" exits, because the proc (closure) references and modifies n.
--
-- Jim Weirich jweirich@one.net [link|http://onestepback.org|http://onestepback.org]
---------------------------------------------------------------------
"Beware of bugs in the above code; I have only proved it correct,
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)
     68k Smalltalk - (deSitter) - (10) - Aug. 24, 2003, 04:12:06 PM EDT
         You might port PocketSmalltalk - (tuberculosis) - Aug. 25, 2003, 11:49:14 AM EDT
         Something else that might interest you - (tuberculosis) - (5) - Aug. 27, 2003, 10:03:39 PM EDT
             Outstanding - thanks -NT - (deSitter) - Aug. 28, 2003, 12:47:59 AM EDT
             Could you explain? - (Arkadiy) - (3) - Aug. 28, 2003, 10:32:58 AM EDT
                 Its not exactly a "stack" - (tuberculosis) - (2) - Aug. 28, 2003, 01:53:08 PM EDT
                     In the spirit of net - (Arkadiy) - (1) - Aug. 28, 2003, 02:01:55 PM EDT
                         Re: In the spirit of net - (JimWeirich) - Aug. 28, 2003, 03:49:01 PM EDT
         Little Smalltalk - (JayMehaffey) - (2) - Sept. 1, 2003, 11:50:11 PM EDT
             Oooh yeah forgot that one - there's a book too. - (tuberculosis) - (1) - Sept. 2, 2003, 08:23:56 PM EDT
                 I have that! - (static) - Sept. 3, 2003, 05:58:36 AM EDT

GOPHERS, not GOLFERS!
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