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* Is it safe to modify a property list directly with PLIST-PUT?
@ 2009-07-26 16:38 Teemu Likonen
  2009-07-26 16:58 ` Teemu Likonen
  2009-07-26 20:07 ` Pascal J. Bourguignon
  0 siblings, 2 replies; 8+ messages in thread
From: Teemu Likonen @ 2009-07-26 16:38 UTC (permalink / raw)
  To: help-gnu-emacs

I use a list of property lists to store data. It's like this:

    (setq my-data '((:foo "one" :bar "two")
                    (:foo "three" :bar "four")))

Sometimes I need to modify the data and a command like this seems to
work:

    (plist-put (nth 1 my-data) :bar "New value")

That is, PLIST-PUT modifies the property list and variable MY-DATA
contains now the modified list:

    ((:foo "one" :bar "two")
     (:foo "three" :bar "New value"))

The question: Is this reliable? Is it guaranteed that it will always
modify the list correctly? If not, how would you suggest doing it
instead?

Common Lisp has so nice SETF macro...


^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2009-07-27 20:17 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2009-07-26 16:38 Is it safe to modify a property list directly with PLIST-PUT? Teemu Likonen
2009-07-26 16:58 ` Teemu Likonen
2009-07-26 17:51   ` Lennart Borgman
2009-07-26 20:07 ` Pascal J. Bourguignon
2009-07-27  5:59   ` Teemu Likonen
2009-07-27  8:31     ` Pascal J. Bourguignon
2009-07-27 17:45       ` Teemu Likonen
2009-07-27 20:17         ` Pascal J. Bourguignon

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