#include <iostream>

#include <opencv2/opencv.hpp>

using namespace cv;

using namespace std;

int main(int argc, char** argv) {

  Mat m = Mat::zeros(3, 3, CV_64F);

  m.at<double>(1,1) = 42;

  cout << "m.data : " << (uint64_t)m.data << endl;

  m.addref();

  cout << "m.refcount : " << *m.refcount << endl;

  m.release();

  cout << "m.data : " << (uint64_t)m.data << endl;

}