c++在while循环中获得一次输出

Question

你好，我想在 while 循环中获取一次输出

While(1){
    if( current->tm_hour == 10 && current->tm_min == 0  ){
        Start_Function();
        std::cout <<  "Started" << std::endl;
    }

    if( current->tm_hour == 12 && current->tm_min == 0  ){
        End_Function();
        std::cout <<  "Ended" << std::endl;
    }

    Sleep(5000);
}

我使用 sleep 每 5 秒刷新一次

所以我想要当前的小时和分钟 = 10 和 00

它给我输出 Started 并且它只调用一次该函数并且它继续刷新

Answer 1

怎么样:

bool start_called = false, end_called = false;
While(1){
    if( current->tm_hour == 10 && current->tm_min == 0 && !start_called  ){
        Start_Function();
        std::cout <<  "Started" << std::endl;
        start_called = true;
    } else
        start_called = false;

    if( current->tm_hour == 12 && current->tm_min == 0 && !end_called ){
        End_Function();
        std::cout <<  "Ended" << std::endl;
        end_called = true;
    } else
        end_called = false;

    Sleep(5000);
}

你可以用仿函数做得更好，但那更高级一些。