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It is normal if you use OpenCV 3.0.0.

Instead, you can use:

cv::Ptr<cv::Feature2D> surf = cv::xfeatures2d::SURF::create();

It is normal if you use OpenCV 3.0.0.

Instead, you can use:

cv::Ptr<cv::Feature2D> surf = cv::xfeatures2d::SURF::create();

It is normal if as you use OpenCV 3.0.0. This way of use has been removed.

Instead, you can use:

cv::Ptr<cv::Feature2D> surf = cv::xfeatures2d::SURF::create();

You will need also the contrib module to have access to SURF keypoints.