Realistic usage of the C99 'restrict' keyword?

Question

I was browsing through some documentation and questions/answers and saw it mentioned. I read a brief description, stating that it would be basically a promise from the programmer that the pointer won't be used to point somewhere else. Can anyone offer some realistic cases where its worth actually using this?

Answer 1

#include <time.h>

#include <stdlib.h>

srand(time(NULL)); // Initialization, should only be called once.

int r = rand(); // Returns a pseudo-random integer between 0 and RAND_MAX.