File : average_queue.ads


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--                         ADAGIO - ADALID - AENEA.                         --

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--  $Id: average_queue.ads,v 1.3 2004/01/21 21:05:43 Jano Exp $


generic
   type Item is private;
   with function "+"(Left, Right: Item) return Item;
   with function "/"(Left: Item; Right: Integer) return float;
package Average_queue is

   pragma Elaborate_body;

   No_data : exception;

   type Object(Size: Positive) is private;

   -- Add a new item

   -- Will lost olders when size exceeded

   procedure Push(this: in out Object; New_item: in Item);

   -- Returns the average of pushed objects

   -- May raise No_data

   function Average(this: in Object) return float;

   -- Says if there is no data to average.

   function Is_empty (This : in Object) return Boolean;

private

   type Data_array is array(Positive range <>) of Item;

   type Object(Size: Positive) is record
      Data: Data_array(1 .. Size);
      Length: Natural:= 0;
      Pos: Positive:= 1;
   end record;

end Average_queue;