c++ - Check if a cv::Point is inside a cv::Mat -

Do anybody know that Opencv provides a function to check that a CV :: Point CV :: Is Matt inside? P>

Actually I am doing:

  int x = (current.x - offset); Int y = current.y; If (x> = 0 & y> gt; = 0 & amp; amp; amp; amp; x> matte cols & y & lt; mat.rows) & amp; Amp; (Int) mat.at  (y, x) == 0)) {return cv :: point (x, y); }}   
 I would like to know whether anything is faster? Or if it was bad to do this   
 
 
 You can set a  cv :: rect   as cv :: mat  and its  are included ()  method:  
  cv :: rect rect (cv :: Point (), matte size ()); CV :: Point P (X, Y); If (rect.contains (p) & amp; mat.at  (y, x) == 0) {return p; }   
 Alternatively, you can get an exception to  at ()  if the index is out of range:  
  UPD:  Comments are properly mentioned by @ Antonio, the following work is only in debug mode, because "", which is amazing and different from how it works.  
  try {if (Mat.at  (y, x) == 0) {return cv :: point (x, y); }} Hold (CV :: Exception & amp; A) {}   
 However, be aware of potential performance fines due to exceptions. If this statement has been executed in a loop or just often you should not use later vision or if it is normal rather than an extraordinary situation.