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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;