#include <stdio.h>
#include <Block.h>
typedef int (^IntBlock)();

IntBlock MakeCounter(int start, int increment) {
  __block int i = start;

  return Block_copy( ^ {
    int ret = i;
    i += increment;
    return ret;
  });

}

int main(void) {
  IntBlock mycounter = MakeCounter(5, 2);
  printf("First call: %d\n", mycounter());
  printf("Second call: %d\n", mycounter());
  printf("Third call: %d\n", mycounter());

  /* because it was copied, it must also be released */
  Block_release(mycounter);

  return 0;
}
/* Output:
  First call: 5
  Second call: 7
  Third call: 9
*/

// From https://en.wikipedia.org/wiki/Objective-C