### Calc eucliadian distance between two single point ?

I have

```
Point2f a(10,10);
Point2f b(100,100);
```

I would like to calc the distance (Euclidean) between these two points.
Instead to write the manual function:

```
float euclideanDist(Point& p, Point& q) {
Point diff = p - q;
return cv::sqrt(diff.x*diff.x + diff.y*diff.y);
}
```

Is there any OpenCV ~~function?~~function? (That's pretty similary to what does descriptormatcher.match() with L2_NORM)