public void Push(T value)
{
_count++;
var newNode = new DoublySungNode <T>(value)
{
Next = _list.Head
};
_list.Head = newNode;
}
public DoublySungNode <T> InsertAt(DoublySungNode <T> node, T value)
{
var newNode = new DoublySungNode <T>(value)
{
Next = node.Next,
Previous = node
};
if (node.Next != null)
{
node.Next.Previous = newNode;
}
node.Next = newNode;
return(newNode);
}
public DoublySungNode <T> Append(T value)
{
var newNode = new DoublySungNode <T>(value);
if (Head == null)
{
Head = newNode;
}
else
{
var lastNode = Traverse().LastOrDefault();
lastNode.Next = newNode;
newNode.Previous = lastNode;
}
return(newNode);
}
public void Remove(DoublySungNode <T> node)
{
if (Head.Equals(node))
{
Head = Head.Next;
}
else
{
if (node.Previous != null)
{
node.Previous.Next = node.Next;
}
if (node.Next != null)
{
node.Next.Previous = node.Previous;
}
}
}
public IEnumerable <DoublySungNode <T> > Traverse(Func <DoublySungNode <T>, DoublySungNode <T>, bool> callback = null)
{
var current = Head;
DoublySungNode <T> last = null;
while (current != null)
{
var callbackResult = callback != null && callback(current, last);
if (callbackResult)
{
break;
}
yield return(current);
last = current;
current = current.Next;
}
}
protected bool Equals(DoublySungNode <T> other)
{
return(EqualityComparer <T> .Default.Equals(Value, other.Value) && Equals(Next, other.Next) && Equals(Previous, other.Previous));
}
public DoublySungNode(T value)
{
Value = value;
Next = null;
Previous = null;
}
