Slot with default argument

beecksche

Hi,
i thought that i could connect a signal to a slot with a default argument. Like said in the doc

My signal:

void newData();

My slot:

void updateValue(bool all = false);

Connect:

QObject::connect(class1, &MyClass1::newData, class2, &MyClass2::updateValue);

When i want to connect them i get
C2338: The slot requires more arguments than the signal provides.

BjornW

Try

QObject::connect(class1, &MyClass1::newData, [=](){ class2->updateValue();});

beecksche

@BjornW
Yes, connect to lambda function works perfectly.

But i thought that connect to a slot with default argument was previos possible. Or am i wrong with that?

BjornW

I do not know :-)

koahnig

There are two methods possible for connect

m.sue

Hi,
It was possible and I would think it's still possible with the SIGNAL, SLOT Macros.
-Michael.

beecksche

@koahnig
@m.sue
You're right! Thanks!

Here is the answer! I need to use the string based syntax !

BjornW

I would strongly recommend the Qt5 way though (using lambdas)!