File : queue_pack_private.ads

package Queue_Pack_Private is

   QueueSize : constant Integer := 10;
   type Element is new Positive range 1..1000;
   type Queue_Type is limited private;

   procedure Enqueue (Item: in  Element; Queue: in out Queue_Type);
   procedure Dequeue (Item: out Element; Queue: in out Queue_Type);

   Queueoverflow, Queueunderflow : exception;

private
   type Marker is mod QueueSize;
   type List is array (Marker'Range) of Element;
   type Queue_State is (Empty, Filled);
   type Queue_Type is record
      Top, Free : Marker      := Marker'First;
      State     : Queue_State := Empty;
      Elements  : List;
   end record;
end Queue_Pack_Private;