Without dynamic dispatch
Shape * shapes[100];
int N;  // number of Shapes in shapes array

void handler(Point p)
{
   Shape *sp;
   for(int i = 0; i < N; i++) {
        sp = shapes[i];
        if ( sp is pointing to a Rectangle that contains p) {
           sp->drawRectangle();
        } else if ( sp is pointing to a Circle that contains p){
           sp->drawCircle();
        } ... etc.
} 

With dynamic dispatch

void handler(Point p)
{
   Shape *sp;
   for(int i = 0; i < N; i++) {
        sp = shapes[i];
        if ( sp->contains(p) ) {
           sp->draw();
        }
   }
}