public IteratorQueue(Iterator<T> iter) {this.iter = iter;T removeTop = removeTop();assert removeTop == null;}

public IteratorQueue ( Iterator < T > iter ) { this . iter = iter ; T removeTop = removeTop ( ) ; assert removeTop == null ; }
public IteratorQueue(IEnumerator<T> iter){this.iter = iter;T removeTop = RemoveTop();Debug.Assert( removeTop == null);}
