https://www.devbean.net/2012/08/qt-study-road-2-signal-slot/
Qt 學習之路 2(5):自定義信號槽
https://www.devbean.net/2012/08/qt-study-road-2-custom-signal-slot/
Qt 學習之路 2(16):深入 Qt5 信號槽新語法
https://www.devbean.net/2012/09/qt-study-road-2-deep-qt5-signals-slots-syntax/
對於有重載的信號,使用static_cast對函數指針進行強制轉換:
QObject::connect(&newspaper,
static_cast<void (Newspaper:: *)(const QString &, const QDate &)>(&Newspaper::newPaper),
&reader,
&Reader::receiveNewspaper);