/// <summary>
/// Create a new intersection set.
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
public IntersectionSet(IReadonlyObservableSet <T> a, IReadonlyObservableSet <T> b)
{
_a = a;
_b = b;
_added = new ObserverSet <Action <T> >();
_removed = new ObserverSet <Action <T> >();
_count = 0;
foreach (var item in a)
{
if (b.Contains(item))
{
_count++;
}
}
_aAddedObserver = a.AddedWeak(AddedToA);
_aRemovedObserver = a.RemovedWeak(RemovedFromA);
_bAddedObserver = b.AddedWeak(AddedToB);
_bRemovedObserver = b.RemovedWeak(RemovedFromB);
}
public SetProxy(IReadonlyObservableSet <T> target) : this()
{
Target = target;
}
/// <summary>
/// Add an removed event handler and remove it, when the disposable is disposed.
/// </summary>
/// <param name="set"></param>
/// <param name="dispose"></param>
/// <param name="action"></param>
/// <typeparam name="T"></typeparam>
public static void Removed <T>(this IReadonlyObservableSet <T> set, Disposable dispose, Action <T> action)
{
dispose.Add(set.Removed(action));
}
/// <summary>
/// Create a new sub set with the specified super set.
/// </summary>
/// <param name="super"></param>
public SubSet(IReadonlyObservableSet <T> super)
{
_super = super;
_superObserver = super.RemovedWeak(item => Remove(item));
}