Q_DECLARE_INTERFACE and namespaces

[wysota]

Did you try declaring the interface inside the namespace?

namespace ... {
  class X ... { ... };
  Q_DECLARE_INTERFACE(X, "...");
}

namespace ... {
  class X ... { ... };
  Q_DECLARE_INTERFACE(X, "...");
}

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Alternatively you can just make your class inherit QObject and add Q_OBJECT macro, you won't need Q_DECLARE_INTERFACE then.