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QT has an Observer mechanism built in, which they call '[Signals and Slots](https://web.archive.org/web/20210210180603/https://doc.qt.io/qt-5/signalsandslots.html)'. It allows objects to communicate with each other without having to have knowledge of either ones internals. By inheriting from `QObject` and defining a few `Q_PROPERTY` macro's, the QT Meta Object Compiler (`moc`) does all the hard work for you. Inside a C++ class this all works handy dandy and is reasonable easy to follow, but when...