Sort matrix in OpenCV

I am having trouble using the cv::sort

functionality in the OpenCV C ++ API .

I am trying to sort content cv::Mat

in OpenCV using

cv::sort(InputArray src, OutputArray dst, int flags);

The following code is giving me a compilation error. I'm not sure what happened with this code:

using namespace std;
using namespace cv;
int main(int argc, char** argv)
{
    Mat matrix(5,5,CV_32F,Scalar(0)),m;
    randn(matrix, 2.00, 1.00);
    cout<<"before sorting:\n"<<matrix<<endl;
    sort(matrix, m, CV_SORT_EVERY_ROW + CV_SORT_ASCENDING);
    cout<<"after sorting:\n"<<m<<endl;
    return 0;
}