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-- CC70001.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 template for a generic formal package may be a child
-- package, and that a child instance which is an instance of the
-- template may be passed as an actual to the formal package. 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. Declare a generic child package of
-- this package which defines additional list operations. Declare a
-- generic subprogram which operates on lists of elements of discrete
-- types. Provide the generic subprogram with three formal parameters:
-- (1) a formal discrete type which represents a list element type, (2)
-- a generic formal package with the parent list generic as template, and
-- (3) a generic formal package with the child list generic as template.
-- Use the formal discrete type as the generic formal actual part for the
-- parent formal package. In the main program, declare an instance of
-- parent, then declare an instance of the child which is itself a child
-- the parent's instance. Pass these instances as actuals to the generic
-- subprogram instance.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
-- 05 Nov 95 SAIC ACVC 2.0.1 fixes: Corrected syntax of formal
-- package declaration.
-- 27 Feb 97 PWB.CTA Added an elaboration pragma.
--!
generic
type Element_Type is private; -- List elems may be of any nonlimited type.
package CC70001_0 is -- List abstraction.
type List_Type is limited private;
-- Return true if current element is last in the list.
function End_Of_List (L : List_Type) return Boolean;
-- Set "current" pointer to first list element.
procedure Reset (L : in out List_Type);
private
type Node_Type;
type Node_Pointer is access Node_Type;
type Node_Type is record
Item : Element_Type;
Next : Node_Pointer;
end record;
type List_Type is record
First : Node_Pointer;
Current : Node_Pointer;
Last : Node_Pointer;
end record;
end CC70001_0;
--==================================================================--
package body CC70001_0 is
function End_Of_List (L : List_Type) return Boolean is
begin
return (L.Current = null);
end End_Of_List;
procedure Reset (L : in out List_Type) is
begin
L.Current := L.First; -- Set "current" pointer to first
end Reset; -- list element.
end CC70001_0;
--==================================================================--
-- Child must be generic since parent is generic. A formal parameter for
-- "element type" can not be provided here, because then the type of list
-- element assumed by these new operations would be different from that
-- defined by the list type declared in the parent.
generic
package CC70001_0.CC70001_1 is -- Additional list operations.
-- Read from current element and advance "current" pointer.
procedure Read_Element (L : in out List_Type; E : out Element_Type);
-- Write to current element and advance "current" pointer.
procedure Write_Element (L : in out List_Type; E : in Element_Type);
-- Add element to end of list.
procedure Add_Element (L : in out List_Type; E : in Element_Type);
end CC70001_0.CC70001_1;
--==================================================================--
package body CC70001_0.CC70001_1 is
procedure Read_Element (L : in out List_Type; E : out Element_Type) is
begin
-- ... Error-checking code omitted for brevity.
E := L.Current.Item; -- Retrieve current element.
L.Current := L.Current.Next; -- Advance "current" pointer.
end Read_Element;
procedure Write_Element (L : in out List_Type; E : in Element_Type) is
begin
-- ... Error-checking code omitted for brevity.
L.Current.Item := E; -- Write to current element.
L.Current := L.Current.Next; -- Advance "current" pointer.
end Write_Element;
procedure Add_Element (L : in out List_Type; E : in Element_Type) is
New_Node : Node_Pointer := new Node_Type'(E, null);
begin
if L.First = null then -- No elements in list, so add new
L.First := New_Node; -- element at beginning of list.
else
L.Last.Next := New_Node; -- Add new element at end of list.
end if;
L.Last := New_Node; -- Set last-in-list pointer.
end Add_Element;
end CC70001_0.CC70001_1;
--==================================================================--
with CC70001_0.CC70001_1; -- Generic list abstraction + additional operations.
generic
-- Import the list abstraction defined in CC70001_0, as well as the
-- additional operations defined in CC70001_0.CC70001_1. Declare a formal
-- discrete type. Restrict this generic procedure to operate only on lists
-- of discrete elements by passing the formal discrete type as an actual
-- parameter to the formal (parent) package.
type Elem_Type is (<>); -- Discrete types only.
with package List_Mgr is new CC70001_0 (Elem_Type);
with package List_Ops is new List_Mgr.CC70001_1 (<>);
procedure CC70001_2 (L : in out List_Mgr.List_Type);
--==================================================================--
procedure CC70001_2 (L : in out List_Mgr.List_Type) is
begin
List_Mgr.Reset (L);
while not List_Mgr.End_Of_List (L) loop
List_Ops.Write_Element (L, Elem_Type'First);
end loop;
end CC70001_2;
--==================================================================--
package CC70001_3 is
type Points is range 0 .. 10;
-- ... Various other types used by the application.
end CC70001_3;
-- No body for CC70001_3;
--==================================================================--
-- Declare instances of the generic list packages for the discrete type.
-- In order to establish that the type passed as an actual to the parent
-- generic (CC70001_0) is the one utilized by the child generic (CC70001_1),
-- the instance of the child must itself be declared as a child of the
-- instance of the parent. Since only library units may have or be children,
-- both instances must be library units.
with CC70001_0; -- Generic list abstraction.
with CC70001_3; -- Package containing discrete type declaration.
pragma Elaborate (CC70001_0);
package CC70001_4 is new CC70001_0 (CC70001_3.Points);
with CC70001_0.CC70001_1; -- Generic extension to list abstraction.
with CC70001_4;
package CC70001_4.CC70001_5 is new CC70001_4.CC70001_1;
--==================================================================--
with CC70001_2; -- Generic "zeroing" op for lists of discrete types.
with CC70001_3; -- Types for application.
with CC70001_4.CC70001_5; -- Discrete list abstraction + additional ops.
with Report;
procedure CC70001 is
package Lists_Of_Scores renames CC70001_4;
package Score_Ops renames CC70001_4.CC70001_5;
Scores : Lists_Of_Scores.List_Type; -- List of points.
procedure Reset_All_Scores is new CC70001_2 -- Operation on lists of
(Elem_Type => CC70001_3.Points, -- points.
List_Mgr => Lists_Of_Scores,
List_Ops => Score_Ops);
-- Begin test code declarations: -----------------------
type TC_Score_Array is array (1 .. 3) of CC70001_3.Points;
TC_Initial_Values : constant TC_Score_Array := (2, 4, 6);
TC_Final_Values : constant TC_Score_Array := (0, 0, 0);
TC_Correct_Initial_Values : Boolean := False;
TC_Correct_Final_Values : Boolean := False;
procedure TC_Initialize_List (L : in out Lists_of_Scores.List_Type) is
begin -- Initial list contains 3 scores
for I in TC_Score_Array'Range loop -- with the values 2, 4, and 6.
Score_Ops.Add_Element (L, TC_Initial_Values(I));
end loop;
end TC_Initialize_List;
procedure TC_Verify_List (L : in out Lists_of_Scores.List_Type;
Expected : in TC_Score_Array;
OK : out Boolean) is
Actual : TC_Score_Array;
begin -- Verify that all scores have been
Lists_of_Scores.Reset (L); -- set to zero.
for I in TC_Score_Array'Range loop
Score_Ops.Read_Element (L, Actual(I));
end loop;
OK := (Actual = Expected);
end TC_Verify_List;
-- End test code declarations. -------------------------
begin
Report.Test ("CC70001", "Check that the template for a generic formal " &
"package may be a child package, and that a child instance " &
"which is an instance of the template may be passed as an " &
"actual to the formal package. Check that the visible part " &
"of the generic formal package includes the first list of " &
"basic declarative items of the package specification");
TC_Initialize_List (Scores);
TC_Verify_List (Scores, TC_Initial_Values, TC_Correct_Initial_Values);
if not TC_Correct_Initial_Values then
Report.Failed ("List contains incorrect initial values");
end if;
Reset_All_Scores (Scores);
TC_Verify_List (Scores, TC_Final_Values, TC_Correct_Final_Values);
if not TC_Correct_Final_Values then
Report.Failed ("List contains incorrect final values");
end if;
Report.Result;
end CC70001;
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