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-- CC70003.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 the actual passed to a formal package may be a formal
-- access-to-subprogram type. Check that the visible part of the generic
-- formal package includes the first list of basic declarative items of
-- the package specification.
--
-- TEST DESCRIPTION:
-- Declare a list abstraction in a generic package which manages lists of
-- elements of any nonlimited type (foundation code). Declare a generic
-- package which supports the execution of lists of operations. Provide
-- the generic package with two formal parameters: (1) a formal access-
-- to-function type, and (2) a generic formal package with the list
-- abstraction package as template. Within a procedure declared in the
-- list-execution package, utilize information about the profile of
-- the functions in the list. Declare a package which declares functions
-- matching the profile of the formal access-to-subprogram type. In the
-- main program, create a list of pointers to the functions declared in
-- the package, instantiate the list abstraction and list-execution
-- packages, and use the list-execution procedure to call each of the
-- functions in the list in sequence.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
generic
type Element_Type is private;
package CC70003_0 is -- This package simulates a generic list abstraction.
-- The definition of List_Type below is purely artificial; its validity
-- in the context of the abstraction is irrelevant to the feature being
-- tested.
type Element_Ptr is access Element_Type;
subtype List_Size is Natural range 1 .. 2;
type List_Type is array (List_Size) of Element_Ptr;
function View_Element (I : List_Size; L : List_Type) return Element_Type;
procedure Write_Element (I : in List_Size;
L : in out List_Type;
E : in Element_Type);
-- ... Other list operations for Element_Type.
end CC70003_0;
--==================================================================--
package body CC70003_0 is
-- The implementations of the operations below are purely artificial; the
-- validity of their implementations in the context of the abstraction is
-- irrelevant to the feature being tested.
function View_Element (I : List_Size; L : List_Type) return Element_Type is
begin
return L(I).all;
end View_Element;
procedure Write_Element (I : in List_Size;
L : in out List_Type;
E : in Element_Type) is
begin
L(I) := new Element_Type'(E);
end Write_Element;
end CC70003_0;
--==================================================================--
with CC70003_0; -- Generic list abstraction.
generic
type Elem_Type is access function (F : Float) return Float;
with package List_Mgr is new CC70003_0 (Elem_Type);
package CC70003_1 is -- This package simulates support for executing lists
-- of operations.
procedure Execute_List (L : List_Mgr.List_Type; F : in out Float);
-- ... Other operations.
end CC70003_1;
--==================================================================--
package body CC70003_1 is
procedure Execute_List (L : List_Mgr.List_Type; F : in out Float) is
begin
for I in L'Range loop
F := List_Mgr.View_Element(I, L)(F); -- Execute next operation in
end loop; -- list with current value of
end Execute_List; -- F as operand.
end CC70003_1;
--==================================================================--
package CC70003_2 is
function Sine (F : Float) return Float;
function Exp (F : Float) return Float;
-- ... Other math functions.
end CC70003_2;
--==================================================================--
package body CC70003_2 is
-- The implementations of the functions below are purely artificial; the
-- validity of their implementations in the context of the abstraction is
-- irrelevant to the feature being tested.
function Sine (F : Float) return Float is
begin
return (-0.15);
end Sine;
function Exp (F : Float) return Float is
begin
if (F = 0.0) then
return (-0.69);
else
return (2.0); -- This branch should be taken.
end if;
end Exp;
end CC70003_2;
--==================================================================--
with CC70003_0; -- Generic list abstraction.
with CC70003_1; -- Generic operation-list abstraction.
with CC70003_2; -- Math library.
with Report;
procedure CC70003 is
type Math_Op is access function (F : Float) return Float;
package Math_Op_Lists is new CC70003_0 (Math_Op);
package Math_Op_List_Support is new CC70003_1 (Math_Op, Math_Op_Lists);
Sin_Ptr : Math_Op := CC70003_2.Sine'Access;
Exp_Ptr : Math_Op := CC70003_2.Exp'Access;
Op_List : Math_Op_Lists.List_Type;
Operand : Float := 0.0;
Expected : Float := 2.0;
begin
Report.Test ("CC70003", "Check that the actual passed to a formal " &
"package may be a formal access-to-subprogram type");
Math_Op_Lists.Write_Element (1, Op_List, Sin_Ptr);
Math_Op_Lists.Write_Element (2, Op_List, Exp_Ptr);
Math_Op_List_Support.Execute_List (Op_List, Operand);
if (Operand /= Expected) then
Report.Failed ("Incorrect results from indirect function calls");
end if;
Report.Result;
end CC70003;
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