wait until a signal is processed

[mentalmushroom]

i have MyClass declared as

class MyClass
{
};
 
Q_DECLARE_METATYPE(MyClass)

class MyClass
{
};

Q_DECLARE_METATYPE(MyClass)

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and this is how i establish my connections:

MyClass myclass;
 
qRegisterMetaType<MyClass>();
 
bool con;
con = connect(thread, SIGNAL(mysignal1(int)), this, SLOT(myslot1(int)), Qt::BlockingQueuedConnection);
con = connect(thread, SIGNAL(mysignal2(MyClass &)), this, SLOT(myslot2(MyClass &)), Qt::BlockingQueuedConnection);

MyClass myclass;

qRegisterMetaType<MyClass>();

bool con;
con = connect(thread, SIGNAL(mysignal1(int)), this, SLOT(myslot1(int)), Qt::BlockingQueuedConnection);
con = connect(thread, SIGNAL(mysignal2(MyClass &)), this, SLOT(myslot2(MyClass &)), Qt::BlockingQueuedConnection);

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i see the following in the output window:

QObject::connect: Cannot queue arguments of type 'MyClass&'
(Make sure 'MyClass&' is registered using qRegisterMetaType().)
The program '[13916] testsignals.exe: Native' has exited with code 0 (0x0).

QObject::connect: Cannot queue arguments of type 'MyClass&'
(Make sure 'MyClass&' is registered using qRegisterMetaType().)
The program '[13916] testsignals.exe: Native' has exited with code 0 (0x0).

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maybe the issue is caused by reference?