// Toposort 2, node rescanning using a view.
// Uses no method call stack and no extra data structures, but slower.
public static IList <MyNode <T> > Toposort2 <T>(params MyNode <T>[] starts)
{
var sorted = new HashedLinkedList <MyNode <T> >();
foreach (MyNode <T> start in starts)
{
if (!sorted.Contains(start))
{
sorted.InsertLast(start);
using (IList <MyNode <T> > cursor = sorted.View(sorted.Count - 1, 1))
{
do
{
MyNode <T> child;
while ((child = PendingChild(sorted, cursor.First)) != null)
{
cursor.InsertFirst(child);
cursor.Slide(0, 1);
}
}while (cursor.TrySlide(+1));
}
}
}
return(sorted);
}
public void Main()
{
var list = new HashedLinkedList <int> {
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59
};
// View of item
list.ViewOf(2);
// Last view of item
list.LastViewOf(11);
// View in range
var view = list.View(0, 3);
// Slide with offset
view.Slide(3);
// Slide with offset and set lenght
view.Slide(-3, 3);
// Try slide with offset and set lenght
var hasSucceed = view.TrySlide(-10, 3);
// Try slide with offset and set lenght
view.TrySlide(3, -3);
var view2 = list.View(0, 3);
var view3 = list.View(1, 3);
// Check if views overlap
Overlap(view2, view3);
// Check if views contained in each other
ContainsView(view2, view3);
// Span views
var spannedView = view2.Span(view3);
// Invalidate all views by shuffle
list.Shuffle();
// Check if view is valid
Console.WriteLine($"View is valid? {view.IsValid}");
}
public bool TryPeek(out System.Collections.Generic.IList <T> items, int count)
{
items = new List <T>();
lock (@lock)
{
var dequeueCount = Math.Min(collection.Count, count);
((List <T>)items).AddRange(collection.View(0, dequeueCount));
}
return(items.Any());
}