public static ReadOnlyCollection <T> Family <T>(this Hierarchy <T> node)
where T : class, IHierarchy <T>
{
return(((IImmutableHierarchy)node).Family().AssertCast <T>().ToReadOnly());
}
public static ReadOnlyCollection <T> ChildrenRecursive <T>(this Hierarchy <T> node)
where T : class, IHierarchy <T>
{
return(((IImmutableHierarchy)node).ChildrenRecursive().AssertCast <T>().ToReadOnly());
}