Thread: question on syntax

Originally Posted by nasser

Code:

void search_list(datalist_t *list, int key,
   void (*print_data_func)(void*))
{

    	datalist_t *p;

 	p = list;
	while (p != NULL ) {

		if  (p->item_key == key ) {
		print_data_func(p->item_value);
		break;
	}

	p = p->next;

}

}

Can anyone help me understand the second line? Is this a pointer to a pointer or something? And whats with the voids?

thanks

if I'm not mistaken, that's a pointer to a function that takes a pointer to type void as a parameter and returns nothing (void).

Originally Posted by nasser

I see, but why would you need a pointer to a function? :s

Couldn't you just create a function prototype for print_data_func and call it like normal??

well, sometimes some people like to do things their own way, hence the function pointer