getObjectType is void and it throws exceptions.

src/TNL/Exceptions/NotTNLFile.h

src/TNL/Exceptions/ObjectTypeDetectionFailure.h

src/TNL/Meshes/Readers/TNLReader.h

src/TNL/Object.h

src/TNL/Object.hpp

src/Tools/tnl-diff.cpp

src/Tools/tnl-init.cpp

src/Tools/tnl-lattice-init.h

src/Tools/tnl-view.h