How to match different paras for signal and slots using new functional-style "connect"?

[goldenhawking]

Hello !
In Qt4, we know that we can connect a signal which have more parameters than a slot :

connect(timer, SIGNAL(timeout()), widget, SLOT(update()));

timer is a QTimer object pointer, and widget is a QWidget.

However , it seems that new functional style connect requires signal and slot functions have same parameters table.

connect (timer, &QTimer::timeout, widget, &MyWidget::update);

The code above fired a compiler error, that is caused by Exact Match Parameter Table.

Question1:
For qt5 new functional style connect, how to deal with function overload and different paras connection?
Question2:
Will old style connect (using marco) be supported in future?

Thanks!

[joeQ]

@goldenhawking Hi,friend. Welcome.

You can see this thread About signal and slots in Qt4 and Qt5.

If I remember correctly, you should be a Chinese teacher. So, i find Chinese blog from cnblog for you. cnblog Qt Signal and slot.

End, if you want to get more information, you could search signal and slot in Qt help manual.

[goldenhawking]

@joeQ said in How to match different paras for signal and slots using new functional-style "connect"?:

cnblog

thanks！

[mrjj]

Will old style connect (using marco) be supported in future?

Maybe in some distant future it will be removed
but it will break heaps of code so i be surprised
if they removed anytime soon.

But it would make porting 4.X code to 5.X extra complicated so
i really doubt it will be removed in this decade.

The real benefit of the new syntax is that it fails at compile time and not
runtime.
Also Docs says

Connecting C++ Objects to QML Objects

The string-based syntax can connect C++ objects to QML objects, but the functor-based syntax cannot. 

So that give me some reassurance as long as widgets exists.

http://doc.qt.io/qt-5/signalsandslots-syntaxes.html

[goldenhawking]

@mrjj said in How to match different paras for signal and slots using new functional-style "connect"?:

ome rea

Thank you very much of these answers!