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--- CC54003.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-subprogram type may be passed as an
--- actual to a generic formal access-to-subprogram type. Check that
--- designated subprograms may be called by dereferencing the access
--- values.
---
--- TEST DESCRIPTION:
--- The generic implements a stack of access-to-subprogram objects as an
--- array. The profile of the access-to-subprogram formal corresponds to
--- a function which accepts a parameter of some type and returns an
--- object of the same type.
---
--- For this test, the functions for which access values will be pushed
--- onto the stack accept a parameter of type access-to-string, lengthen
--- the pointed-to string, then return an access object pointing to this
--- lengthened string.
---
--- The instance declares a function Execute_Stack which executes each
--- subprogram on the stack in sequence. This function accepts some initial
--- access-to-string, then returns an access object pointing to the
--- lengthened string resulting from the execution of the stacked
--- subprograms. Access-to-string objects are used rather than strings
--- themselves because the initial string "grows" during each iteration.
---
---
--- CHANGE HISTORY:
--- 06 Dec 94 SAIC ACVC 2.0
--- 10 Apr 96 SAIC ACVC 2.1: Added pragma Elaborate to context clause
--- preceding CC54003_2.
---
---!
-
-generic
-
- Size : in Positive;
-
- type Item_Type (<>) is private;
- type Item_Ptr is access Item_Type;
-
- type Function_Ptr is access function (Item : Item_Ptr)
- return Item_Ptr;
-
-package CC54003_0 is -- Generic stack of pointers.
-
- type Stack_Type is private;
-
- procedure Push (Stack : in out Stack_Type;
- Func_Ptr : in Function_Ptr);
-
- function Execute_Stack (Stack : Stack_Type;
- Initial_Input : Item_Ptr) return Item_Ptr;
-
- -- ... Other operations.
-
-private
-
- subtype Index is Positive range 1 .. (Size + 1);
- type Stack_Type is array (Index) of Function_Ptr; -- Last slot unused.
-
- Top : Index := 1; -- Top refers to the next available slot.
-
-end CC54003_0;
-
-
- --===================================================================--
-
-
-package body CC54003_0 is
-
- procedure Push (Stack : in out Stack_Type;
- Func_Ptr : in Function_Ptr) is
- begin
- Stack(Top) := Func_Ptr;
- Top := Top + 1; -- Artificial: no Constraint_Error protection.
- end Push;
-
-
- -- Call each subprogram on the stack in sequence. For the first call, pass
- -- Initial_Input. For succeeding calls, pass the result of the previous
- -- call.
-
- function Execute_Stack (Stack : Stack_Type;
- Initial_Input : Item_Ptr) return Item_Ptr is
- Result : Item_Ptr := Initial_Input;
- begin
- for I in reverse Index'First .. (Top - 1) loop -- Artificial: no C_E
- Result := Stack(I)(Result); -- protection.
- end loop;
- return Result;
- end Execute_Stack;
-
-end CC54003_0;
-
-
- --===================================================================--
-
-
-package CC54003_1 is
-
- subtype Message is String;
- type Message_Ptr is access Message;
-
- function Add_Prefix (Msg_Ptr : Message_Ptr) return Message_Ptr;
- function Add_Suffix (Msg_Ptr : Message_Ptr) return Message_Ptr;
-
- -- ...Other operations.
-
-end CC54003_1;
-
-
- --===================================================================--
-
-
-package body CC54003_1 is
-
- function Add_Prefix (Msg_Ptr : Message_Ptr) return Message_Ptr is
- Sender : constant String := "Dummy: "; -- Artificial; in a real
- -- application Sender might
- New_Msg : Message := Sender & Msg_Ptr.all; -- be a call to a function.
- begin
- return new Message'(New_Msg);
- end Add_Prefix;
-
-
- function Add_Suffix (Msg_Ptr : Message_Ptr) return Message_Ptr is
- Time : constant String := " (12:03pm)"; -- Artificial; in a real
- -- application Time might be a
- New_Msg : Message := Msg_Ptr.all & Time; -- be a call to a function.
- begin
- return new Message'(New_Msg);
- end Add_Suffix;
-
-end CC54003_1;
-
-
- --===================================================================--
-
-
-with CC54003_0; -- Generic stack of pointers.
-pragma Elaborate (CC54003_0);
-
-with CC54003_1; -- Message abstraction.
-
-package CC54003_2 is
-
- type Operation_Ptr is access function (Msg_Ptr : CC54003_1.Message_Ptr)
- return CC54003_1.Message_Ptr;
-
- Maximum_Ops : constant := 4; -- Arbitrary.
-
- package Stack_of_Ops is new CC54003_0
- (Item_Type => CC54003_1.Message,
- Item_Ptr => CC54003_1.Message_Ptr,
- Function_Ptr => Operation_Ptr,
- Size => Maximum_Ops);
-
- Operation_Stack : Stack_Of_Ops.Stack_Type;
-
-
- procedure Create_Operation_Stack;
-
-end CC54003_2;
-
- --===================================================================--
-
-
-package body CC54003_2 is
-
- procedure Create_Operation_Stack is
- begin
- Stack_Of_Ops.Push (Operation_Stack, CC54003_1.Add_Prefix'Access);
- Stack_Of_Ops.Push (Operation_Stack, CC54003_1.Add_Suffix'Access);
- end Create_Operation_Stack;
-
-end CC54003_2;
-
-
- --===================================================================--
-
-
-with CC54003_1; -- Message abstraction.
-with CC54003_2; -- Message-operation stack.
-
-with Report;
-procedure CC54003 is
-
- package Msg_Ops renames CC54003_2.Stack_Of_Ops;
-
- Msg : CC54003_1.Message_Ptr := new CC54003_1.Message'("Hello there");
- Expected : CC54003_1.Message := "Dummy: Hello there (12:03pm)";
-
-begin
- Report.Test ("CC54003", "Check that a general access-to-subprogram type " &
- "may be passed as an actual to a generic formal " &
- "access-to-subprogram type");
-
- CC54003_2.Create_Operation_Stack;
-
- declare
- Actual : CC54003_1.Message_Ptr :=
- Msg_Ops.Execute_Stack (CC54003_2.Operation_Stack, Msg);
- begin
- if Actual.all /= Expected then
- Report.Failed ("Wrong result from dereferenced subprogram execution");
- end if;
- end;
-
- Report.Result;
-end CC54003;