Re: elisp macros problem

[Kalle Olavi Niemitalo]

Lowell Kirsh <lkirsh@cs.ubc.ca> writes:

> the reason that i didn't realize it was working was that i
> thought you could (add-hook 'some-mode ...) more than once, but
> really, this will just overwrite the previously added hook.

No, it won't.

(setq sample-hook '())
(add-hook 'sample-hook 'sample-1)
(add-hook 'sample-hook 'sample-2)
(add-hook 'sample-hook 'sample-2)

After these forms, the value of sample-hook is (sample-2 sample-1).
The second add-hook did not overwrite the first one.
However, the third one had no effect, because sample-2 was
already in the hook.