What does this code block mean?

[Mr Pang]

    AnalTask *analTask = new AnalTask();
    analTask->setOptions(options);

    MainWindow *main = this->main;
    connect(analTask, &AnalTask::openFileFailed, main, &MainWindow::openNewFileFailed);
    connect(analTask, &AsyncTask::finished, main, [analTask, main]() {
        if (analTask->getOpenFileFailed()) {
            return;
        }
        main->finalizeOpen();
    });

Hi,
I see such code block in a project, and cannot understand the second connect() function, I didn't see such code before. Can someone tell me what does "analTask, main{}" means?

Thanks!

[jsulm]

@Mr-Pang You should read about C++ lambdas: https://en.cppreference.com/w/cpp/language/lambda

connect(analTask, &AsyncTask::finished, main, [analTask, main]() {
        if (analTask->getOpenFileFailed()) {
            return;
        }
        main->finalizeOpen();
    });

In this connect the last parameter is a lambda function. This means it is a function without a function name. In this case this function gets no parameters, but analTask and main are captured and are available inside the lambda function.

[JonB]

@Mr-Pang said in What does this code block mean?:

what does "analTask, main{}" means

:) [Sorry!]

[Mr Pang]

@jsulm
Great!
Thanks!