pointer to function in constructor

Originally Posted by

I have to convert a program from C to C++. The original code used
drivers that were available in C, and now are only available in C++.
Thus, I have the "honour" of converting the code.
There are a couple of areas that are blocking me. I've already taken
care of the rest.
>
I have a structure that is initialized as soon as it is declared in a
variable :
<<
const struct driver_t beirlistener_driver = {
* * * * .name = "beirlistener_driver",
* * * * .cfg_ctl = {
* * * * * * * * .cfg_new = &beirlistener_cfg_new,
* * * * * * * * .cfg_parse = &beirlistener_cfg_parse,
* * * * * * * * .cfg_del = &beirlistener_cfg_del,
* * * * * * * * .cfg_parse_ended = &beirlistener_cfg_parse_end
* * * * },
* * * * .ctx_ctl = {
* * * * * * * * .ctx_new = &beirlistener_ctx_new,
* * * * * * * * .ctx_del = &beirlistener_ctx_del
* * * * },
* * * * .thread_ctl = {
* * * * * * * * .run = &beirlistener_run,
* * * * * * * * .queue_clean = NULL,
* * * * * * * * .stop = &thread_request_stop_intr
* * * * }};
>
name is, of course, a 'char *'.
cfg_ctl, ctx_ctl and thread_ctl are structures containing pointers to
functions.
The structure contains the necessary functions called to initialize,
un, and destroy/delete a thread. It is used in several different
files, depending on the thread it has to start.
>
Of course, it would be folly to suppose that it would be accepted as
is in C++. It's not.
The only real solution I could find was to declare a constructor for
the struct (not really elegant, I know), which would receive the
addresses of the functions that are called. So the variable
declaration would be something along the lines of :
<<
const struct driver_t beirlistener_driver = {"beirlistener_driver",
&beirlistener_cfg_new, &beirlistener_cfg_parse, ...};
>
However, I tried declaring it as such ... :
<<
struct driver_t {
* * * * char * * * * * * * * * ** * * *name;
* * * * struct config_ctl_t * * * * * * cfg_ctl;
* * * * struct context_ctl_t * * * * * *ctx_ctl;
* * * * struct thread_ctl_t * * * * * * thread_ctl;
>
* * * * driver_t(char * cname, int (*fcn)(void **)) {
* * * * * * * * name = cname;
* * * * * * * * cfg_ctl.cfg_new = fcn;
* * * * }};
>
... along with the variable declaration as mentioned just above, but
it doesn't work. It doesn't seem to recognize the pointer to a
function in the constructor, since it gives me the following message :
<<
/home/anton/Projects/splusserver3/src/beirlistener.c:90: error: scalar
object ‘beirlistener_driver’ requires one element in initializer
>
>
>
I've done research, but I con't find a solution to this.
Any help anyone can give me to resolve this is very much appreciated.
Thanks all.

Originally Posted by

On Aug 21, 10:29 am, Mad Ant <anton.har...@gmail.comwrote:
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Try:
>
const struct driver_t beirlistener_driver = {
"beirlistener_driver",
{
&beirlistener_cfg_new,
&beirlistener_cfg_parse,
&beirlistener_cfg_del,
&beirlistener_cfg_parse_end
},
{
&beirlistener_ctx_new,
&beirlistener_ctx_del
},
{
&beirlistener_run,
NULL,
&thread_request_stop_intr
}
};
>
Cheers! --M

Originally Posted by

Hello all.
>
I have to convert a program from C to C++. The original code used
drivers that were available in C, and now are only available in C++.
Thus, I have the "honour" of converting the code.