/// <summary>
/// Initialize a new progressive search for the specified tree.
/// </summary>
internal ProgressiveSearch(PatternSearch <TKey, TValue> tree)
{
_current = _root = tree._root;
}
/// <summary>
/// Initialize a new dynamic search for the specified tree.
/// </summary>
internal DynamicSearch(PatternSearch <TKey, TValue> tree)
{
_root = tree._root;
_branches = new Queue <Branch>();
Values = new ArrayRig <TValue>();
}