protected LinkIterator(AbstractLinkedMap parent)
     : base()
 {
     this.parent           = parent;
     this.nextJ            = parent.header.after;
     this.expectedModCount = parent.modCount;
 }
 protected internal ValuesIterator(AbstractLinkedMap parent)
     : base(parent)
 {
 }
 protected internal LinkMapIterator(AbstractLinkedMap parent)
     : base(parent)
 {
 }
 protected LinkIterator(AbstractLinkedMap parent)
     : base()
 {
     this.parent = parent;
     this.nextJ = parent.header.after;
     this.expectedModCount = parent.modCount;
 }
 protected internal KeySetIterator(AbstractLinkedMap parent)
     : base(parent)
 {
 }
 protected internal ValuesIterator(AbstractLinkedMap parent)
     : base(parent)
 {
 }
 protected internal KeySetIterator(AbstractLinkedMap parent)
     : base(parent)
 {
 }
 protected internal LinkMapIterator(AbstractLinkedMap parent)
     : base(parent)
 {
 }