Strange behavior short simple code with cv::Point and a references

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That simple code leads 20 error in xutility file, and when I had commented temp = distance(p, pi), then solution successfully built. How to fix code; and why did errors appear?

P.S. static analyzer tells me about type pi : cv::Point_<int> pi, is that relates to the problem?

typedef vector<cv::Point> Points;

double distance (cv::Point& p1, cv::Point& p2) 
{
    return sqrt( pow( p1.x - p2.x,2) + pow( p1.y - p2.y,2));
}

double distance (cv::Point& p, Points& ps) 
{
     double d = numeric_limits<double>::max();
     double temp;

     for (auto pi: ps) 
     {
          temp = distance(p, pi);
          if (temp < d) d = temp;
     }
     return d;
}