C/C++ - CallBack

　　这是实验楼上一个callback debug例子，我没有提交验证，但在本地上运行没有任何问题，也无警告：

#include <stdio.h>

#define MAX 3

typedef int (*alarm) (int type);

alarm alarm_list[MAX];
int index = 0;

void register_alarm(alarm a);
int hit_alarm(int index);

void register_alarm(alarm a)
{
    alarm_list[index++] = a;
}

int hit_alarm(int index)
{
    if (index < 0 || index >= MAX)
        return 1;
    (*alarm_list[index]) (index);
    return 0;
}

int alarm1(int type)
{
    printf("one:%d\n", type);
    return 0;
}

int alarm2(int type)
{
    printf("two:%d\n", type);
    return 0;
}

int alarm3(int type)
{
    printf("three:%d\n", type);
    return 0;
}

int main
{
    register_alarm(alarm1);
    register_alarm(alarm2);
    register_alarm(alarm3);

    hit_alarm(0);
    hit_alarm(1);
    hit_alarm(2);

    return 0;
}