When you use custom types, it's pretty usual to register them all before building any of the widgets that will use them as part of your application startup sequence after you created your QApplication object.

@BigBen said in Potential memory leak in QSignalMapper : Qt version 6.3.0:

connect(myMapper, SIGNAL(mapped(int)), this, SLOT(up(int)));

I'm pretty sure that this:
connect(myMapper, SIGNAL(mapped(int)), this, SLOT(up(int)));

should not be done in the loop.
There should only be one connect of the mapper to the receiving object

@JonB thx. I input was wrong.