public Enumerator(LinkedHashMap <TKey, TValue> dictionary) : base(dictionary)
 {
 }
 public BackwardEnumerator(LinkedHashMap <TKey, TValue> dictionary)
 {
     this.dictionary = dictionary;
     version         = dictionary.version;
     current         = dictionary.header;
 }
 public ValuesCollection(LinkedHashMap <TKey, TValue> dictionary)
 {
     this.dictionary = dictionary;
 }