玩聚上看见 神啊，C 终于开始支持 closure 了，吓了一跳啊，我的天啊！
#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() {
IntBlock mycounter = MakeCounter(5, 2);
printf("First call: %d\n", mycounter());
printf("Second call: %d\n", mycounter());
printf("Third call: %d\n", mycounter());
Block_release(mycounter);
return 0;
}
/* Output:
First call: 5
Second call: 7
Third call: 9
*/