[plt-scheme] Closures

From: Joel J. Adamson (jadamson at partners.org)
Date: Mon Nov 5 14:40:52 EST 2007

hendrik at topoi.pooq.com writes:

> Ah.  Let's say you're a function.

"Your immune system is like an army..."

> Now this package of code-plus-environment, which closes off all the 
> dangling reference a function might have, is called a closure.  
> Abd indeed, because it is the closure of a function you can call it.

Okay, I have not read the materials Matthias or Shriram suggested, so
I'm still naïve about this: this makes sense, however, from your
description you (the programmer) call the function, right?  The
environment exists (it's there), but you don't invoke an environment.
If you can, however, that's pretty cool and please tell me about it ;)

> I don't even know if Scheme has any kinds of closures that can't be 
> called.  I don't know of any.  So if your frame-sets are different 
> (you seem to think they can't be called) perhaps you could give me an 
> intuitive explanation what *they* are.

Just to clarify, I'm not dealing with a specific problem, I'm just
always looking for more ways to "think in Scheme."

Thanks, this definitely helps,

Joel J. Adamson
Pediatric Psychopharmacology Research Unit
Massachusetts General Hospital
Boston, MA  02114
(617) 643-1432
(303) 880-3109

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