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I have changed your code a little, using cv::Ptr instead of pointers:
cv::Ptr< cv::FeatureDetector > detector = new cv::SiftFeatureDetector();
cv::Ptr< cv::DescriptorExtractor > extractor = new cv::SiftDescriptorExtractor();
And using OpenCV 2.4.9 it works file, the allDescriptors is not empty at the end.
By the way, I have not found "opencv2\xfeatures2d\nonfree.hpp", so I have used #include <opencv2\nonfree\features2d.hpp>. Maybe it is a problem of 3.0.0?