C++ Reactive Programming

Meta-object system

The Qt meta-object system realizes the signals and slots mechanism for inter-object communication, the dynamic property system, and run-time type information.

The Qt meta-object system is based on three key aspects:

• QObject class: The base class that provides the advantages of the meta-object system to Qt objects
• Q_OBJECT macro: The macro to provide in the private section of the class declarations, used to enable meta-object features, such as dynamic properties, signals, and slots
• The MOC: It supplies each QObject subclass with the necessary code to implement meta-object features

The MOC executes before the actual compilation of a Qt source file. When the MOC finds class declarations that contain the Q_OBJECT macro, it ...