make error #25
Description
In Ubuntu18，after I build opecv3.4 and ncnn ,make error.
/home/LET-NET/tracking.cpp: In member function ‘std::vector<cv::Point_ > corner_tracking::extractFeature(const cv::Mat&, int, const std::vector<cv::Point_ >&)’:
/home/LET-NET/tracking.cpp:147:6: error: invalid initialization of reference of type ‘const cv::ParallelLoopBody&’ from expression of type ‘corner_tracking::extractFeature(const cv::Mat&, int, const std::vector<cv::Point_ >&)::<lambda(const cv::Range&)>’
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