Class QVariant - Video

The class QVariant is a truly important class in Qt, which offers the possibility to provide anything to a function, or return anything from one. If you know modern C++, then it is a bit like std::any, and if you are more familiar with plain C, then you will find some resemblances to its union.

Links:
* Avoiding QVariant::fromValue in QWAM: https://youtu.be/caNufuHsUjs?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

* Documentation on QVariant QAbstractItemModel: https://doc.qt.io/qt-6/qabstractitemmodel.html#data

* Adapting Column Content to Size in QWAM: https://www.youtube.com/watch?v=1oGZr4X3GXo&list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

* KDAB Rust training info: https://training.kdab.com/portfolio/rust/

The example code showcased in this video is available here: https://github.com/KDABLabs/kdabtv/tree/master/Programming-With-Qt-Widgets

0:00 Introduction
0:25 Union datatype or union
4:47 QVariant
5:55 Rust training KDAB
6:10 QVariant
9:27 Q_DECLARE_METATYPE
11:39 qRegisterMetatype
15:51 QVariant usages
21:13 Conclusion

All 'Introduction to Qt Widgets - Module 1' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6hgf7zCKF2Rv9Y0WoN8RVGf

All 'Introduction to Qt Widgets - Module 2' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6j_c41CFMprvg9EiWz0WdSy

All 'Introduction to Qt Widgets - Module 3' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6hWZO_viEf1rfjgk4E6SCKd

All 'Introduction to Qt Widgets - Module 4' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6iXUNQMb2GkEjV_oK6Xid9-

All 'Introduction to Qt Widgets - Module 5' videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6h1tsLAETdrrFlsVMeYpiHI