"Fast Clear List"

public sealed class FastClearList<T> where T : struct {
	private T[] storage;
	private int counter;

	public int Count {
		get {
			return counter;
		}
	}

	public FastClearList() {
		storage = new T[4];
		counter = 0;
	}

	public void Add(T item) {
		if (counter >= storage.Length) {
			var newStorage = new T[storage.Length << 1];
			Array.Copy(storage, 0, newStorage, 0, storage.Length);
			storage = newStorage;
		}
		storage[counter++] = item;
	}

	[MethodImpl(MethodImplOptions.AggressiveInlining)]
	public void Clear() {
		counter = 0;
	}

	public T this[int index] {
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		get {
			return storage[index];
		}
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		set {
			storage[index] = value;
		}
	}
}