【c语言】设置回调时定义多个回调函数

#include <stdio.h>

typedef int (*Callback_onStart)(int, int);
typedef int (*Callback_onStop)(int);

int onStart(int a, int b) {
    printf("onStart a(%d) b(%d)\n", a, b);
    return a + b;
}

int onStop(int a) {
    printf("onStop a(%d)\n", a);
    return a;
}

typedef struct Callback {
    Callback_onStart start;
    Callback_onStop stop;
} Callback;


Callback gCallback;

void setCallback(Callback callback) {
    gCallback = callback;
    gCallback.start = onStart;
    gCallback.stop = onStop;
}

int main() {
    printf("main begin\n");
    setCallback(gCallback);
    int retStart = gCallback.start(5, 6);
    int retStop = gCallback.stop(10);
    printf("retStart(%d) retStop(%d)\n", retStart, retStop);
    printf("main end\n");
    return 0;
}