c++ signal to qml slot - Testing C++ signal-slot libraries | by Julien Jorge | Medium online slot 888

Compares the two syntaxes for making signal-slot connections in C++. ... Qt offers two different ways to write signal-slot connections in C++: The string-based connection syntax and the functor-based connection syntax.

If a signal is connected to a slot then the slot is called when the signal is emitted.

This program demonstrates how QML and C++ can be connected through Qt signals and slots. It does this through embedding C++ code as a context property in QML rather than explicitly connecting signals and slots.