WSUserFunction (C Function)
is a WSTP type that describes a function pointer to a function taking an WSLINK argument with a return type of void.
Details
- The function WSSetUserData() takes a WSUserFunction as its second argument. WSTP automatically calls the WSUserFunction at WSClose() time.
- WSUserFunction is declared in the WSTP header file wstp.h.
Examples
Basic Examples (1)
#include <stdlib.h>
#include "wstp.h"
typedef struct foo_
{
int member1;
} foo;
/* destroy a foo object retrieved from a link */
void c(WSTPINK lp)
{
foo *fobj;
fobj = WSTPUserData(lp, (WSTPUserFunction *)0);
if(fobj == (foo *)0) return;
free(foo);
}
/* allocate a foo object and store it in a link */
void f(WSLINK lp)
{
foo *fobj;
fobj = (foo *)malloc(sizeof(foo));
if(fobj == (foo *)0)
{ /* error allocating space for foo object */ }
WSSetUserData(lp, (void *)fobj, c);
}