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Re: save-restriction, save-excursion

From: David Kastrup
Subject: Re: save-restriction, save-excursion
Date: 17 Sep 2002 04:33:49 +0200
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50

Ryan Yeske <address@hidden> writes:

> pokerface <address@hidden> writes:
> > I am beginning to study Emacs Lisp and I have the following question:
> > 
> > Why is it wrong to write (save-restriction
> >                            (save-excursion
> >                                ....))
> > 
> > and it is recommended instead to write
> >                          (save-excursion
> >                            (save-restriction
> >                                ....))
> From the node "Narrowing" in the elisp manual:
>      `save-restriction' does _not_ restore point and the mark; use
>      `save-excursion' for that.  If you use both `save-restriction' and
>      `save-excursion' together, `save-excursion' should come first (on
>      the outside).  Otherwise, the old point value would be restored
>      with temporary narrowing still in effect.  If the old point value
>      were outside the limits of the temporary narrowing, this would
>      fail to restore it accurately.

Hmmm.  What if I have a restriction active and write
    (goto (point-min))))

When the restriction gets restored, point will lie outside of the
restored restriction.  Wouldn't that cause trouble?

Should one rather have

When the change of restriction is to something narrower, but


when the change is to something wider?

Or is this nonsense for some reason?

David Kastrup, Kriemhildstr. 15, 44793 Bochum
Email: address@hidden

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