Qtimer iterations

Qtimer iterations

本文关键字：iterations Qtimer      更新时间：2023-10-16

也许我想多了，但需要一些迭代和qtimer方面的帮助。我有以下QTimer代码和函数（我试图尽可能简化它，如果某些语法错误，对不起）： 

    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(whateverfunction()));
    timer -> start();
void MainWindow::whateverfunction()
{
checksomething();
if (checksomething() == 1)
{
dosomething1(); //function I want to run ONLY the first time checksomething() = 1
dosomething2(); //function I want to run the second,third,fourth,etc. time checksomething() = 1
}
else
{
donothing(); //if this function is run the count resets, meaning dosomething1() should be run again if checksomething() == 1 again-- but only the first time.
}
}

我怎样才能完成上述任务？我尝试引入一个控制变量，但每次通过 QTimer 运行此函数时，它都会重置。谢谢！

我建议用 std：：call_once 来包装对dosomething1()的调用

std::once_flag flag;
void MainWindow::whateverfunction()
{
checksomething();
if (checksomething() == 1)
{
    std::call_once(flag, [this](){
        dosomething1();
    };
    dosomething2();
}
}
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