From: Neil Jerram <neil@ossau.uklinux.net>
Cc: guile-user@gnu.org
Subject: Re: one C function to many Scheme functions
Date: 08 Jan 2003 20:45:43 +0000 [thread overview]
Message-ID: <m3smw3fk08.fsf@laruns.ossau.uklinux.net> (raw)
In-Reply-To: <20030106203029.GA11033@gosia>
>>>>> "bajcik" == bajcik <bajcik@kolos.math.uni.lodz.pl> writes:
bajcik> But I want to declare many functions in a loop. I have a
bajcik> table of names and a table of C-functions [ mytype_t
bajcik> function(my_type arg) ] and only ONE C-function that
bajcik> converts SCM to mytype_t. It is a wrapper.
Guile does not have anything like gh_new_procedure_data. However your
general objective can easily be achieved like this ...
bajcik> I would like to do it this way:
bajcik> typedef struct
bajcik> {
bajcik> mytype_t (*func)(mytype_t arg);
bajcik> char *name;
bajcik> } scm_func_t;
bajcik> scm_func_t FuncTable[50]; /* Initialized */
bajcik> SCM wrapper(SCM arg, void *data) /* !!! watch "data" */
Change this to SCM wrapper(SCM arg, SCM index).
bajcik> {
bajcik> scm_func_t *sf = (scm_func_t *)data;
Change this to:
scm_func_t *sf = &(FuncTable[SCM_INUM(index)]);
bajcik> my_type_t my_result;
bajcik> ...
bajcik> my_arg = SCM2my(arg);
bajcik> ...
bajcik> my_result = sf->func(my_arg)
bajcik> ...
bajcik> return my2SCM(my_result);
bajcik> }
bajcik> void declare_all_functions()
bajcik> {
bajcik> int i;
bajcik> for (i=0; i<50; i++)
bajcik> gh_new_procedure_data(FuncTable[i].func, &FuncTable[i]);
Change this to a gh_new_procedure for just one Scheme function, which
maps to wrapper. (With no loop.)
Then in Scheme:
(define (name0 arg) (wrapper arg 0))
(define (name1 arg) (wrapper arg 1))
(define (name2 arg) (wrapper arg 2))
...
Does this help?
Neil
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next prev parent reply other threads:[~2003-01-08 20:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-06 20:30 one C function to many Scheme functions bajcik
2003-01-08 20:45 ` Neil Jerram [this message]
2003-01-09 10:26 ` Krzysztof Garus
2003-01-09 23:30 ` Neil Jerram
2003-01-09 11:40 ` Matthias Koeppe
2003-01-09 23:19 ` Neil Jerram
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