Written by marcelpetrick on December 11, 2019
While implementing some custom-class (C++17; Qt5.12) some specialities became (painfully) noticeable.
The guide at the Qt-source is quite well written.
- ctor, copy-ctor and dtor are all required and have to be public
- add Q_DECLARE_METATYPE(CustomClass)
- QDebug-stream-operator in case of simple debugging-messages
- if the QVariant-version of the CustomClass shall be written to QSettings, then implement also the two streaming operators: << and >> (else crash with Assert “unable to save type”): howto