Slot not getting called, Qt::ConnectionType, Thread

[ChrisW67]

Look in the output of your program for warnings like:

QObject::connect: Cannot queue arguments of type 'A::B::J&'                                                          
(Make sure 'A::B::J&' is registered using qRegisterMetaType().)

QObject::connect: Cannot queue arguments of type 'A::B::J&'                                                          
(Make sure 'A::B::J&' is registered using qRegisterMetaType().)

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You will not be able to queue a reference though.

[MarekR22]

if it is a const reference then he can to queue it, but he have to provide meta data for that type of reference.
Not const reference requires Blocking Queued Connection.
See:
http://developer.qt.nokia.com/doc/qt...across-threads
http://developer.qt.nokia.com/doc/qt...ctionType-enum
http://developer.qt.nokia.com/doc/qt...gisterMetaType