public class HeadedQueue<TF, TS>
where TF : class
where TS : class

Public Class HeadedQueue(Of TF As Class, TS As Class)

generic<typename TF, typename TS>
where TF : ref class
where TS : ref class
public ref class HeadedQueue

type HeadedQueue<'TF, 'TS when 'TF : not struct when 'TS : not struct> =  class end