On Wed, Sep 8, 2010 at 2:01 PM, thomas <[email protected]> wrote:
> Hi ,
>
> I hope someone can clarify this queries on function pointers :
>
> void (*func_ptr[](void)= {func1,func2,func3....funcN};
> What values will sizeof(func_ptr) and sizeof(*func_ptr) return ?
The (length of the array of function pointers x size of a function
pointer), and the (size of a function pointer) respectively.
The actual values will be dependant on your platform:
[...@pjhlaptop tmp]# cat x.c
#include <stdio.h>
void a(void){}
int* b(int i, float f, char* c){return 0;}
void (*p[])(void) = {a, a, a, a, a, a, a};
int* (*q[])(int, float, char*) = {b, b, b, b, b, b, b};
int main(void){
printf("p:%d, *p:i%d\n", sizeof p, sizeof *p);
printf("q:%d, *q:i%d\n", sizeof q, sizeof *q);
return 0;
}
[...@pjhlaptop tmp]# make x
cc x.c -o x
[...@pjhlaptop tmp]# ./x
p:28, *p:i4
q:28, *q:i4
--
PJH
