Vector iteration

std::vector<container> point;
std::vector<container>::iterator it;

for (it = point.begin(); it != point.end(); ++it)
 {
   dx = it->getValueX();
   dy = it->getValueY();

   if((dx-1 <= event->x) && (event->x <= dx+1) && (dy-1 <= event->y) && (event->y <= dy+1))
    {
      //do something
    }
 }