Qt: meaning of slot return value?

Question

According to the documentation the return value from a slot doesn\'t mean anything.
Yet in the generated moc code I see that if a slot returns a value this value is used

Answer 1

It is Very useful when you deal with dynamic language such qtscript JavaScript QtPython and so on. With this language/bindings, you can use C++ QObject dinamically using the interface provided by MetaObject. As you probably know, just signals and slots are parsed by moc and generate MetaObject description. So if you are using a C++ QObject from a javascript binding, you will be able to call just slots and you will want the return value. Often Qt bindings for dynamic languages provides some facility to acces to normal method, but the process is definitely more triky.