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Re: `save-excursion' defeated by `set-buffer'
From: |
Stefan Monnier |
Subject: |
Re: `save-excursion' defeated by `set-buffer' |
Date: |
Sat, 09 Jan 2010 23:57:08 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.1.91 (gnu/linux) |
> which to code things, just what is inherently wrong or dangerous (meriting a
> warning) with code like the following, to do some work in other buffers yet
> return to the original buffer AND restore its point and mark?
> (save-excursion
> (set-buffer FOO)
> ; Pick up some info in FOO, & perhaps assign it to a var
> (set-buffer BAR)
> ; Calculate something in BAR, & perhaps record it too
> ...
> )
What is dangerous about it is that dependong on which buffer is current
before executing this code, the point-saving will either do something
or nothing. That's a very delicate semantics, which (as mentioned) I've
never found to be correct (i.e. the only times it works reliably is
when the point-saving part of save-excursion is never useful nor
harmful).
Anyway, we just disagree,
Stefan
- RE: `save-excursion' defeated by `set-buffer', Drew Adams, 2010/01/04
- Re: `save-excursion' defeated by `set-buffer', Stefan Monnier, 2010/01/04
- Re: `save-excursion' defeated by `set-buffer', David Kastrup, 2010/01/05
- RE: `save-excursion' defeated by `set-buffer', Drew Adams, 2010/01/05
- Re: `save-excursion' defeated by `set-buffer', Stefan Monnier, 2010/01/05
- Re: `save-excursion' defeated by `set-buffer', David Kastrup, 2010/01/06
- RE: `save-excursion' defeated by `set-buffer', Drew Adams, 2010/01/06
- Re: `save-excursion' defeated by `set-buffer',
Stefan Monnier <=
- Re: `save-excursion' defeated by `set-buffer', David Kastrup, 2010/01/10
- Re: `save-excursion' defeated by `set-buffer', Stefan Monnier, 2010/01/10
- Re: `save-excursion' defeated by `set-buffer', David Kastrup, 2010/01/11
- Re: `save-excursion' defeated by `set-buffer', martin rudalics, 2010/01/11
- Re: `save-excursion' defeated by `set-buffer', Stefan Monnier, 2010/01/11
- RE: `save-excursion' defeated by `set-buffer', Drew Adams, 2010/01/10
- Re: `save-excursion' defeated by `set-buffer', Stefan Monnier, 2010/01/09
- Re: `save-excursion' defeated by `set-buffer', Harald Hanche-Olsen, 2010/01/10
- Re: `save-excursion' defeated by `set-buffer', martin rudalics, 2010/01/10
- RE: `save-excursion' defeated by `set-buffer', Drew Adams, 2010/01/10