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Use the d-pointer idiom ([1], [2]) to hide the private data members from the CameraManager class interface. This will ease maintaining ABI compatibility, and prepares for the implementation of the CameraManager class threading model. [1] https://wiki.qt.io/D-Pointer [2] https://en.cppreference.com/w/cpp/language/pimpl Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>