private void AddForConsolidation(HeapNode newRoots)
{
Debug.Assert(newRoots != null);
foreach (var root in newRoots.GetSiblings())
{
Debug.Assert(root.LeftSibling != null && root.RightSibling != null);
}
newRoots.Parent = null;
if (_consolidateRoots == null)
{
_consolidateRoots = newRoots;
}
else
{
_consolidateRoots.InsertBefore(newRoots);
}
foreach (var root in newRoots.GetSiblings())
{
Debug.Assert(root.LeftSibling != null && root.RightSibling != null);
}
}
public override NodeItem <TKey, TValue> Add(TKey key, TValue value)
{
var newNode = new HeapNode(key, value);
#if VERBOSE
Console.WriteLine("Current min ({0}:{1}:{2}) >>",
_roots.Count(r => r != null),
_consolidateRoots == null ? 0 : _consolidateRoots.GetSiblings().Count(),
Count);
Console.WriteLine(_minNode == null ? string.Empty : _minNode.ToString(_traversalActions));
Console.WriteLine(">> Add >> " + newNode);
#endif
if (Count == 0)
{
Debug.Assert(_roots.Count == 0);
_minNode = newNode;
_roots.Push(_minNode);
Count = 1;
return(newNode);
}
// Check for an improved minimum
if (Comparer.Compare(key, _minNode.Key) <= 0)
{
_minNode = newNode;
}
// Only store the node for a later consolidation
AddForConsolidation(newNode);
Count++;
return(newNode);
}