OC：块

1. 块初体验

#include <stdio.h>

void func(int (^block)(int, int))
{
    int v = block(10, 20);
    printf("%d\n", v);
}

int main()
{
    int (^b)(int, int) = ^(int x, int y) {
        return x + y;
    };
    func(b);
}