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From: Elena <egarrulo@gmail.com>
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Subject: Emacs Lisp style on callbacks?
Date: Thu, 21 Oct 2010 07:06:24 -0700 (PDT)
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Hello,

this a question about style.

I'm writing an asynchronous function which upon completion will
execute a callback.  Would you suggest using separate callbacks for
successful and unsuccessful completion? or would you suggest using the
same callback which takes a cons with a success flag as its car?  Any
other suggestions?

I know Emacs Lisp lacks closures: the function would take care of all
additional book-keeping.

Thank you.