C++（1）：error: invalid conversion from ‘void (*)()’ to ‘void (*)(int)

void signaldemo_test(void)
{
    struct itimerval tv, otv;
    signal(SIGALRM, sigFunc);
    //how long to run the first time
    tv.it_value.tv_sec = 3;
    tv.it_value.tv_usec = 0;
    //after the first time, how long to run next time
    tv.it_interval.tv_sec = 5;
    tv.it_interval.tv_usec = 0;
    if (setitimer(ITIMER_REAL, &tv, &otv) != 0)     //定时每隔5s执行一次
    {
        printf("setitimer err %d
", errno);
    }
    while(1)
    {
        sleep(2);
        //隔2s打印一遍
        printf("otv: %d, %d, %d, %d
", otv.it_value.tv_sec, otv.it_value.tv_usec, otv.it_interval.tv_sec, otv.it_interval.tv_sec);
    }
}

void sigFunc()
{
    static int iCnt = 0;    printf("The %d Times: my girl maybe in SZ library 
", iCnt++);}
}

以上这段代码在用g++编译是会有如下错误：
/mnt/hgfs/Linux/cleanCup/src/signaldemo.cpp:9: error: invalid conversion from ‘void (*)()’ to ‘void (*)(int)’
/mnt/hgfs/Linux/cleanCup/src/signaldemo.cpp:9: error:   initializing argument 2 of ‘void (* signal(int, void (*)(int)))(int)’

值得注意的是在gcc编译时不会出错，但是用g++就会有问题，究其原因就是C语言编译器允许隐含性的将一个通用指针转换为任意类型的指针，而C＋＋不允许。

void sigFunc(int)
{
    static int iCnt = 0;    printf("The %d Times: my girl maybe in SZ library 
", iCnt++);}
}