/// <summary>
/// Removes all objects from the set.
/// </summary>
public void Clear()
{
_tree = new RbTree(_comparer);
_count = 0;
}
/// <summary>
/// Creates an instance of SetBase.
/// </summary>
/// <param name="comparer">Comparer that specifies sort order of the elements.</param>
/// <param name="allowDuplicates">Whether multiple duplicate (equivalent) elements are allowed.</param>
public SetBase(System.Collections.IComparer comparer, bool allowDuplicates)
{
_comparer = comparer;
_allowDuplicates = allowDuplicates;
_tree = new RbTree(_comparer);
}