From: "Ratson Janiv" <janiv@013.net.il>
Subject: coding problems, please help.
Date: Mon, 8 Dec 2003 22:34:38 +0200
Date: 2003-12-08T22:34:38+02:00 [thread overview]
Message-ID: <3fd4e0e2$1@news.barak.net.il> (raw)
with Jr.Queue;
with Jr.Queue.Max_Bounded_Queue;
use Jr.Queue.Max_Bounded_Queue;
procedure Q2 is
package My_Queue is new Max_Bounded_Queue(T=>Integer,">"=>">");
begin
null;
end Q2;
compile error :
q2.adb:5:07: invalid prefix in selected component "Queue"
q2.adb:9:28: "Max_Bounded_Queue" is not visible
q2.adb:9:28: non-visible declaration at jr-queue-max_bounded_queue.ads:7
q2.adb:9:28: non-visible declaration at jr-queue-max_bounded_queue.ads:5
why ?
generic
type T is private;
package Jr.Queue is
type Queue is abstract tagged private;
procedure Push(Q: in out Queue'class;Item:T) is abstract;
procedure Pop(Q: in out Queue'class;Item:in out T) is abstract;
function Empty(Q: Queue'class) return Boolean is abstract;
private
type Queue is tagged null record;
end Jr.Queue;
-------------------------
with Jr.Queue;
generic
package Jr.Queue.Max_Queue is
type Max_Queue is abstract new Queue with null record;
function Max(Q:Max_Queue) return T is abstract;
end Jr.queue.Max_Queue;
-----------------------
generic
with function ">"(Item1,Item2:T) return Boolean;
package Jr.Queue.Max_Bounded_Queue is
type Max_Bounded_Queue is new Queue with private;
procedure Push(Q: in out Max_Bounded_Queue;Item:T);
procedure Pop(Q: in out Max_Bounded_Queue;Item:in out T);
function Empty(Q: Max_Bounded_Queue) return Boolean;
function Max(Q:Max_Bounded_Queue) return T;
Queue_Full, Queue_Empty :exception;
private
Num_Items : constant := 100;
type Queue_Arr is array (1..Num_Items) of T;
type Max_Bounded_Queue is new Queue with record
Arr : Queue_Arr;
I : Integer := 1;
Max_Item : T;
end record;
procedure Find_Max(Q: in out Max_Bounded_Queue);
end Jr.Queue.Max_Bounded_Queue;
10x.
next reply other threads:[~2003-12-08 20:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-08 20:34 Ratson Janiv [this message]
2003-12-08 21:31 ` coding problems, please help Ratson Janiv
2003-12-09 7:48 ` Petter Fryklund
2003-12-09 8:40 ` Dmitry A. Kazakov
2003-12-13 15:13 ` Mr. J.
2003-12-13 17:19 ` Dmitry A. Kazakov
2003-12-13 14:58 ` Ratson Janiv
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