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Re: the module system ?
From: |
David Pirotte |
Subject: |
Re: the module system ? |
Date: |
Tue, 06 Mar 2001 19:34:59 +0100 |
Martin Grabmueller wrote:
> >
> > (define (close-db . con?)
> > (set! pg-con '())
> > (if (not (null? con?))
> > (eval `(set! ,(car con?) '()))))
>
> A question: What is it you are doing here? The use of eval looks a
> bit strange, you are passing a symbol to `close-db' which gets set to
> '(). This will most probably result in an error if you are calling
> the procedure from another module, because variables always belong to
> the module where they are defined in.
Let's forget about this, I admit it is a bit strange. I wanted to be 'clean',
with the job to be accomplished by db-close, including bounding the variable
to nil, which required to pass its symbol-name but it is probably not a good
idea.
> > 2] when I try to use it:
> > ------------------------
>
> ...
> You have to make sure that the variable `pg-connectdb' is exported
> from the module where it is define (I assume it is (database
> postgres)).
Yes, I am sure it is exported. The reason I sent the mail to guile-user list is
because
it seems that the behavior of guile is different whether you launch guile in a
shell
and then 'manually' use-modules, as I showed above, or whether you launch it
as is (assuming the following is in a file "tactus.scm"):
#!/usr/local/bin/guile -s
!#
(use-modules (alto db-stuff))
(define pg-con
(open-db "tactus" "david"))
(display pg-con)
(display "\n")
(set! pg-con '())
and then:
address@hidden:~/alto/projects/guile/tactus 27 $ ./tactus.scm
#<PG-CONN:1:tactus:localhost:5432:>
address@hidden:~/alto/projects/guile/tactus 28 $
as you see, it works perfectly fine, so why does it not work from a guile
listener?
thanks,
David
- the module system ?, David Pirotte, 2001/03/06
- Re: the module system ?, Martin Grabmueller, 2001/03/06
- Re: the module system ?,
David Pirotte <=
- Re: the module system ?, Mikael Djurfeldt, 2001/03/06
- Re: the module system ?, David Pirotte, 2001/03/06
- Re: the module system ?, Ian Grant, 2001/03/07
- Re: the module system ?, Mikael Djurfeldt, 2001/03/07
- Guile-pg modules bug fix., Ian Grant, 2001/03/08
- Re: the module system ?, Ian Grant, 2001/03/08