public T Current(DoubleLinkedListEnumerator <T> enumerator)
{
if (enumerator.Index == 0 || (enumerator.Index == enumerator.List.Count + 1))
{
throw XExceptions.InvalidOperation.EnumOpCantHappen();
}
return(enumerator.Current);
}
public void Reset(DoubleLinkedListEnumerator <T> enumerator)
{
if (enumerator.Version != enumerator.List.Version)
{
throw XExceptions.InvalidOperation.EnumFailedVersion();
}
enumerator.Current = default(T);
enumerator.Node = enumerator.List.Head;
enumerator.Index = 0;
}
public DoubleLinkedListEnumerator <T> Create(DoubleLinkedList <T> collection)
{
var enumerator = new DoubleLinkedListEnumerator <T>
{
List = collection,
Version = collection.Version,
Node = collection.Head,
Current = default(T),
Index = 0,
SiInfo = null
};
return(enumerator);
}
public bool MoveNext(DoubleLinkedListEnumerator <T> enumerator)
{
if (enumerator.Version != enumerator.List.Version)
{
throw XExceptions.InvalidOperation.EnumFailedVersion();
}
if (enumerator.Node == null)
{
enumerator.Index = enumerator.List.Count + 1;
return(false);
}
++enumerator.Index;
enumerator.Current = enumerator.Node.Value;
enumerator.Node = enumerator.Node.Next;
if (enumerator.Node == enumerator.List.Head)
{
enumerator.Node = null;
}
return(true);
}
public void Dispose(DoubleLinkedListEnumerator <T> enumerator)
{
enumerator.Current = default(T);
enumerator.List = null;
}