Qt coding

[MartinD]

I like C# for its very clear syntax. Could you please point me out how to write this piece of C# code in Qt to achieve best readability of the code:

Timer timer = new Timer();
timer.Elapsed += (sender, e) => { Console.WriteLine("Elapsed");};
timer.Interval = 100;
timer.Start();

I like this code in C# because only 4 lines of code are sufficient to start timer and do some action when the timer elapses. Also I like that you can see all the functionality on one place (anonymous method). I hope something similar is achievable in Qt and C++.

[elveatles]

QTimer has a good example of this in their documentation:

http://doc.qt.io/qt-4.8/qtimer.html

There's no anonymous function call, but the syntax is still pretty clear.

[jsulm]

One note: Qt is not a programming language! Qt is a C++ framework (similar to what .Net framework is) and as such is usually used with C++ as programming language. But you can use Qt with other programming languages as well, for example Python.

C++ supports lambda functions since C++11 standard.

[MartinD]

@elveatles So this seems to be minimal syntax, right?

QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(elapsed()));
timer->start(1000);

// then somewhere there is elapsed method:

void elapsed( void) {
qDebug() << "Elapsed"
}

// Then in .h file I also need to declare elapsed().

void elapsed( void);

[elveatles]

Yeah, That's the closest Qt translation.

[MartinD]

@jsulm Sorry not to be very precise.

[Devopia53]

// with c++11

auto timer = new QTimer;
connect(timer, &QTimer::timeout, []{qDebug() << "Elapsed";});
timer->start(1000);