public void AddOnCollisionEnter2dDelegate(OnCollisionEnter2dDelegate del)
 {
     this.OnCollisionEnter2dDelegates += del;
 }
 public void RemoveOnCollisionEnter2dDelegate(OnCollisionEnter2dDelegate del)
 {
     this.OnCollisionEnter2dDelegates -= del;
 }
 public void RemoveOnCollisionEnter2dDelegate(OnCollisionEnter2dDelegate del)
 {
     this.OnCollisionEnter2dDelegates -= del;
 }
 public void AddOnCollisionEnter2dDelegate(OnCollisionEnter2dDelegate del)
 {
     this.OnCollisionEnter2dDelegates += del;
 }