QT: Connect a signal with a fundamental type in its signature to a slot with QVariant in its signature

Question

I'd like to connect a signal with one parameter of a fundamental type like

void toggled(bool checked)
void valueChanged(int i)
...

to a slot with its parameter being of type QVariant:

void setValue( QVariant &value )

Is that possible using Qt 5.14 ?

score 2 · Answer 1 · answered Jan 13 '20 at 15:01

2

Given that Qvariant has constructors from int and bool, these constructors will be used to perform the implicit conversion.

answered Jan 13 '20 at 15:01

UmNyobe

Thanks, that theoretically answers the question. – Lars Hadidi Jan 13 '20 at 15:32

score 1 · Accepted Answer · answered Jan 13 '20 at 15:14

1

You can as long as you change

void setValue(QVariant & value)

into

void setValue(QVariant value)

or

void setValue(const QVariant & value)

otherwise compilation will fail with a static assertion failed (Signal and slot arguments are not compatible).

answered Jan 13 '20 at 15:14

p-a-o-l-o

2 Answers2