Signal from variable

[waynew]

I'm trying to set up a signal/slot for a change in variable value.
The variable is global, ::gOper
In the class it is declared in, is the following code:

connect(gOper, SIGNAL(valueChanged()), this, SLOT(updateStats()));

connect(gOper, SIGNAL(valueChanged()), this, SLOT(updateStats()));

To copy to clipboard, switch view to plain text mode 

But, it doesn't compile.
error: no matching function for call to `MainWindow::connect(QString&, const char*, MainWindow* const, const char*)'

So how do you refer to the variable? Or what am I doing wrong?

[squidge]

The variable must be a QObject-derived class, not a QString.

So create a class, give it a setter, getter and signal, and then use connect()

[waynew]

Tnx Fatjuicymole, I got it now.