[PD] exiting function in external
IOhannes m zmölnig via Pd-list
pd-list at lists.iem.at
Tue Jun 17 13:27:27 CEST 2014
On 06/17/2014 08:17 AM, Jaime E Oliver via Pd-list wrote:
> Hi all,
>
> I am writing a long and complex external.
>
> There are several conditions in which a particular function could fail and in any of those cases I'd like to report the error and stop the execution of the function.
>
> I tried using the exit() function, but that quits pd, and what I really need is for the function to simply stop.
>
> Does pd have a function for doing this?
no. you would have to do this yourself.
afaik, the easiest way to do it is:
if(bad_condition) {
pd_error(x, "bad condition met!");
return;
}
if you need to cleanup you could use:
if(bad_condition) {
pd_error(x, "bad condition met!");
goto fail;
}
// ...
fail:
free_ressources(x);
in general, you might want to split your complex function into small
functions that returns their success, then do:
int do_A(ressource*X) {
if(is_bad(X)){
error("X is bad!");
return 0;
}
return 1;
}
//...
int processing() {
X=make_ressource();
if(do_A(X) && do_B(X) && do_C(X)) {
// success
}
free_ressource(X);
}
when using C++, you can use exceptions...which you have to catch() in
order to not-quit-Pd
fgmards
IOhannes
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