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From: Evans Winner on 29 May 2010 05:02
(Thanks for the replies to the question I recently posted
about floating point numbers; they were very helpful.)

I hope this question isn't too half-baked. It's probably a
problem with my understanding of packages. I have noticed
that some systems (eg. ltk) don't just define a package for
code, like "ltk", they also define a package, like
"ltk-user" that is apparently the place that users are meant
to, uh, use the system. What I seem to be too dense to
understand is what exactly this buys the user. Ltk, for
example, has a defpackage that uses :common-lisp. Then
ltk-user, uses :common-lisp and :ltk. So what is the
functional difference between a user being in ltk and being
in ltk-user?
From: Rob Warnock on 29 May 2010 05:53
Evans Winner <thorne(a)unm.edu> wrote:
+---------------
| Ltk, for example, has a defpackage that uses :common-lisp.
| Then ltk-user, uses :common-lisp and :ltk. So what is the
| functional difference between a user being in ltk and being
| in ltk-user?
+---------------

If you're in LTK-USER [or any other packages that only :USEs LTK],
then code you write *won't* conflict with symbols internal to LTK,
that is, that aren't exported from LTK.


-Rob

-----
Rob Warnock <rpw3(a)rpw3.org>
627 26th Avenue <URL:http://rpw3.org/>
San Mateo, CA 94403 (650)572-2607

From: Tim Bradshaw on 29 May 2010 17:28
On 2010-05-29 10:53:31 +0100, Rob Warnock said:

> If you're in LTK-USER [or any other packages that only :USEs LTK],
> then code you write *won't* conflict with symbols internal to LTK,
> that is, that aren't exported from LTK.

I think another way of putting it is to say that you should regard the
package(s) in which the implementation of something lives as sacred to
it: interning things there is modifying the implementation.

From: Evans Winner on 29 May 2010 18:58
Tim Bradshaw <tfb(a)tfeb.org> writes:

I think another way of putting it is to say that you
should regard the package(s) in which the implementation
of something lives as sacred to it: interning things
there is modifying the implementation.

Ah, I see. Funny, that does sound so sensible now. Don't
know why it wasn't obvious to me. Thank you both.
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