File : average_queue.adb
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-- ADAGIO - ADALID - AENEA. --
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-- Copyright (C) 2003 --
-- A. Mosteo. --
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-- Authors: A. Mosteo. (adagio@mosteo.com) --
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-- $Id: average_queue.adb,v 1.3 2004/01/21 21:05:43 Jano Exp $
package body Average_queue is
-- Add a new item
-- Will lost olders when size exceeded
procedure Push(this: in out Object; New_item: in Item) is
begin
this.Data(this.Pos):= New_item;
this.Pos:= this.Pos + 1;
if this.Pos > this.Data'Last then
this.Pos:= this.Data'First;
end if;
if this.Length < this.Data'Length then
this.Length:= this.Length + 1;
end if;
end;
-- Returns the average of pushed objects
function Average(this: in Object) return float is
Acum: Item:= this.Data(this.Data'First);
begin
if this.Length = 0 then
raise No_data;
end if;
for n in this.Data'First + 1 .. this.Data'First + this.Length - 1 loop
Acum:= Acum + this.Data(n);
end loop;
return Acum / this.Length;
end;
-- Says if there is no data to average.
function Is_empty (This : in Object) return Boolean is
begin
return This.Length = 0;
end Is_empty;
end Average_queue;