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-- CC54001.A
--
-- Grant of Unlimited Rights
--
-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
-- unlimited rights in the software and documentation contained herein.
-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
-- this public release, the Government intends to confer upon all
-- recipients unlimited rights equal to those held by the Government.
-- These rights include rights to use, duplicate, release or disclose the
-- released technical data and computer software in whole or in part, in
-- any manner and for any purpose whatsoever, and to have or permit others
-- to do so.
--
-- DISCLAIMER
--
-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
-- PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- OBJECTIVE:
-- Check that a general access-to-constant type may be passed as an
-- actual to a generic formal access-to-constant type.
--
-- TEST DESCRIPTION:
-- The generic implements a stack of access objects as an array. The
-- designated type of the formal access type is itself a formal private
-- type declared in the same generic formal part.
--
-- The generic is instantiated with an unconstrained subtype of String,
-- which results in a stack which can accommodate strings of varying
-- lengths (ragged array). Furthermore, the access objects to be pushed
-- onto the stack are created both statically and dynamically, utilizing
-- allocators and the 'Access attribute.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
-- 10 Apr 96 SAIC ACVC 2.1: Added pragma Elaborate to context clause
-- preceding CC54001_1.
--
--!
generic
Size : in Positive;
type Element_Type (<>) is private;
type Element_Ptr is access constant Element_Type;
package CC54001_0 is -- Generic stack of pointers.
type Stack_Type is private;
procedure Push (Stack : in out Stack_Type;
Elem_Ptr : in Element_Ptr);
procedure Pop (Stack : in out Stack_Type;
Elem_Ptr : out Element_Ptr);
-- ... Other operations.
private
subtype Index is Positive range 1 .. (Size + 1);
type Stack_Type is array (Index) of Element_Ptr; -- Last element unused.
Top : Index := 1;
end CC54001_0;
--===================================================================--
package body CC54001_0 is
procedure Push (Stack : in out Stack_Type;
Elem_Ptr : in Element_Ptr) is
begin
Stack(Top) := Elem_Ptr;
Top := Top + 1; -- Artificial: no Constraint_Error protection.
end Push;
procedure Pop (Stack : in out Stack_Type;
Elem_Ptr : out Element_Ptr) is
begin
Top := Top - 1; -- Artificial: no Constraint_Error protection.
Elem_Ptr := Stack(Top);
end Pop;
end CC54001_0;
--===================================================================--
with CC54001_0; -- Generic stack of pointers.
pragma Elaborate (CC54001_0);
package CC54001_1 is
subtype Message is String;
type Message_Ptr is access constant Message;
Message_Count : constant := 4;
Message_0 : aliased constant Message := "Hello";
Message_1 : aliased constant Message := "Doctor";
Message_2 : aliased constant Message := "Name";
Message_3 : aliased constant Message := "Continue";
package Stack_of_Messages is new CC54001_0
(Element_Type => Message,
Element_Ptr => Message_Ptr,
Size => Message_Count);
Message_Stack : Stack_Of_Messages.Stack_Type;
procedure Create_Message_Stack;
end CC54001_1;
--===================================================================--
package body CC54001_1 is
procedure Create_Message_Stack is
-- Push access objects onto stack. Note that some are statically
-- allocated, and some are dynamically allocated (using an aliased
-- object to initialize).
begin
Stack_Of_Messages.Push (Message_Stack, Message_0'Access); -- Static.
Stack_Of_Messages.Push (Message_Stack,
new Message'(Message_1)); -- Dynamic.
Stack_Of_Messages.Push (Message_Stack, Message_2'Access); -- Static.
Stack_Of_Messages.Push (Message_Stack, -- Dynamic.
new Message'(Message_3));
end Create_Message_Stack;
end CC54001_1;
--===================================================================--
with CC54001_1;
with Report;
procedure CC54001 is
package Messages renames CC54001_1.Stack_Of_Messages;
Msg0, Msg1, Msg2, Msg3 : CC54001_1.Message_Ptr;
begin
Report.Test ("CC54001", "Check that a general access-to-constant type " &
"may be passed as an actual to a generic formal " &
"access-to-constant type");
CC54001_1.Create_Message_Stack;
Messages.Pop (CC54001_1.Message_Stack, Msg3); -- Pop items off stack in the
Messages.Pop (CC54001_1.Message_Stack, Msg2); -- reverse order that they
Messages.Pop (CC54001_1.Message_Stack, Msg1); -- were pushed.
Messages.Pop (CC54001_1.Message_Stack, Msg0);
if Msg0.all /= CC54001_1.Message_0 or else
Msg1.all /= CC54001_1.Message_1 or else
Msg2.all /= CC54001_1.Message_2 or else
Msg3.all /= CC54001_1.Message_3
then
Report.Failed ("Items popped off of stack do not match those pushed");
end if;
Report.Result;
end CC54001;
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