/// <summary>
/// Returns an iterator which yields all elements of the sequence in the reverse order.
/// </summary>
/// <remarks>This should always be equivalent to, but faster than,
/// <code>
/// AsEnumerable().Reverse();
/// </code></remarks>
public IEnumerable <Tuple <TKey, TValue> > ReverseIterator()
{
if (_count == 0)
{
yield break;
}
if (_right.Count() != 0)
{
foreach (var pair in _right.ReverseIterator())
{
yield return(pair);
}
}
yield return(Tuple.New(_key, _value));
if (_left.Count() != 0)
{
foreach (var pair in _left.ReverseIterator())
{
yield return(pair);
}
}
}