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bd8332d2b0
Works around a compiler warning with OSG 3.4: warning: base class 'class osg::Callback' should be explicitly initialized in the copy constructor [-Wextra] With no default argument for osg::CopyOp&, the compiler no longer sees the function as a real copy constructor and stops warning about the missing virtual initializations. We don't care about this warning because there is nothing interesting to initialize in the osg::NodeCallback base anyway. A proper fix for the warning would require to inserting OSG_VERSION conditional compiling all over the place, that is as long as we are still supporting OSG 3.2.