How to use slots in the namespace class

[d_stranz]

However, Qt5's function pointer based connect() can connect to functions that are not slots.

In addition, there are versions of this connect() that do not require a QObject receiver pointer. From the docs for QObject::connect():

void someFunction();
QPushButton *button = new QPushButton;
QObject::connect(button, &QPushButton::clicked, someFunction);

void someFunction();
QPushButton *button = new QPushButton;
QObject::connect(button, &QPushButton::clicked, someFunction);

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So potentially if the code in the original post was cleaned up to proper C++ syntax, then the "someFunction" above could be prefaced by the namespace.