| -- CA11019.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 body of the parent package may depend on one of its own |
| -- private generic children. |
| -- |
| -- TEST DESCRIPTION: |
| -- A scenario is created that demonstrates the potential of adding a |
| -- generic private child during code maintenance without distubing a |
| -- large subsystem. After child is added to the subsystem, a maintainer |
| -- decides to take advantage of the new functionality and rewrites |
| -- the parent's body. |
| -- |
| -- Declare a data collection abstraction in a package. Declare a private |
| -- generic child of this package which provides parameterized code that |
| -- have been written once and will be used three times to implement the |
| -- services of the parent package. In the parent body, instantiate the |
| -- private child. |
| -- |
| -- In the main program, check that the operations in the parent, |
| -- and instance of the private child package perform as expected. |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- 17 Nov 95 SAIC Update and repair for ACVC 2.0.1 |
| -- |
| --! |
| |
| package CA11019_0 is |
| -- parent |
| |
| type Data_Record is tagged private; |
| type Data_Collection is private; |
| --- |
| --- |
| subtype Data_1 is integer range 0 .. 100; |
| procedure Add_1 (Data : Data_1; To : in out Data_Collection); |
| function Statistical_Op_1 (Data : Data_Collection) return Data_1; |
| --- |
| subtype Data_2 is integer range -100 .. 1000; |
| procedure Add_2 (Data : Data_2; To : in out Data_Collection); |
| function Statistical_Op_2 (Data : Data_Collection) return Data_2; |
| --- |
| subtype Data_3 is integer range -10_000 .. 10_000; |
| procedure Add_3 (Data : Data_3; To : in out Data_Collection); |
| function Statistical_Op_3 (Data : Data_Collection) return Data_3; |
| --- |
| |
| private |
| |
| type Data_Ptr is access Data_Record'class; |
| subtype Sequence_Number is positive range 1 .. 512; |
| |
| type Data_Record is tagged |
| record |
| Next : Data_Ptr := null; |
| Seq : Sequence_Number; |
| end record; |
| --- |
| type Data_Collection is |
| record |
| First : Data_Ptr := null; |
| Last : Data_Ptr := null; |
| end record; |
| |
| end CA11019_0; |
| -- parent |
| |
| --=================================================================-- |
| |
| -- This generic package provides parameterized code that has been |
| -- written once and will be used three times to implement the services |
| -- of the parent package. |
| |
| private |
| generic |
| type Data_Type is range <>; |
| |
| package CA11019_0.CA11019_1 is |
| -- parent.child |
| |
| type Data_Elem is new Data_Record with |
| record |
| Value : Data_Type; |
| end record; |
| |
| Next_Avail_Seq_No : Sequence_Number := 1; |
| |
| procedure Sequence (Ptr : Data_Ptr); |
| -- the child must be private for this procedure to know details of |
| -- the implementation of data collections |
| |
| procedure Add (Datum : Data_Type; To : in out Data_Collection); |
| |
| function Op (Data : Data_Collection) return Data_Type; |
| -- op models a complicated operation that whose code can be |
| -- used for various data types |
| |
| |
| end CA11019_0.CA11019_1; |
| -- parent.child |
| |
| --=================================================================-- |
| |
| |
| package body CA11019_0.CA11019_1 is |
| -- parent.child |
| |
| procedure Sequence (Ptr : Data_Ptr) is |
| begin |
| Ptr.Seq := Next_Avail_Seq_No; |
| Next_Avail_Seq_No := Next_Avail_Seq_No + 1; |
| end Sequence; |
| |
| --------------------------------------------------------- |
| |
| procedure Add (Datum : Data_Type; To : in out Data_Collection) is |
| Ptr : Data_Ptr; |
| begin |
| if To.First = null then |
| -- assign new record with data value to |
| -- to.next <- null; |
| To.First := new Data_Elem'(Next => null, |
| Value => Datum, |
| Seq => 1); |
| Sequence (To.First); |
| To.Last := To.First; |
| else |
| -- chase to end of list |
| Ptr := To.First; |
| while Ptr.Next /= null loop |
| Ptr := Ptr.Next; |
| end loop; |
| -- and add element there |
| Ptr.Next := new Data_Elem'(Next => null, |
| Value => Datum, |
| Seq => 1); |
| Sequence (Ptr.Next); |
| To.Last := Ptr.Next; |
| end if; |
| |
| end Add; |
| |
| --------------------------------------------------------- |
| |
| function Op (Data : Data_Collection) return Data_Type is |
| -- for simplicity, just return the maximum of the data set |
| Max : Data_Type := Data_Elem( Data.First.all ).Value; |
| -- assuming non-empty collection |
| Ptr : Data_Ptr := Data.First; |
| |
| begin |
| -- no error checking |
| while Ptr.Next /= null loop |
| if Data_Elem( Ptr.Next.all ).Value > Max then |
| Max := Data_Elem( Ptr.Next.all ).Value; |
| end if; |
| Ptr := Ptr.Next; |
| end loop; |
| return Max; |
| end Op; |
| |
| end CA11019_0.CA11019_1; |
| -- parent.child |
| |
| --=================================================================-- |
| |
| -- parent body depends on private generic child |
| with CA11019_0.CA11019_1; -- Private generic child. |
| |
| pragma Elaborate (CA11019_0.CA11019_1); |
| package body CA11019_0 is |
| |
| -- instantiate the generic child with data types needed by the |
| -- package interface services |
| package Data_1_Ops is new CA11019_1 |
| (Data_Type => Data_1); |
| |
| package Data_2_Ops is new CA11019_1 |
| (Data_Type => Data_2); |
| |
| package Data_3_Ops is new CA11019_1 |
| (Data_Type => Data_3); |
| |
| --------------------------------------------------------- |
| |
| procedure Add_1 (Data : Data_1; To : in out Data_Collection) is |
| begin |
| -- maybe do other stuff here |
| Data_1_Ops.Add (Data, To); |
| -- and here |
| end; |
| |
| --------------------------------------------------------- |
| |
| function Statistical_Op_1 (Data : Data_Collection) return Data_1 is |
| begin |
| -- maybe use generic operation(s) in some complicated ways |
| -- (but simplified out, for the sake of testing) |
| return Data_1_Ops.Op (Data); |
| end; |
| |
| --------------------------------------------------------- |
| |
| procedure Add_2 (Data : Data_2; To : in out Data_Collection) is |
| begin |
| Data_2_Ops.Add (Data, To); |
| end; |
| |
| --------------------------------------------------------- |
| |
| function Statistical_Op_2 (Data : Data_Collection) return Data_2 is |
| begin |
| return Data_2_Ops.Op (Data); |
| end; |
| |
| --------------------------------------------------------- |
| |
| procedure Add_3 (Data : Data_3; To : in out Data_Collection) is |
| begin |
| Data_3_Ops.Add (Data, To); |
| end; |
| |
| --------------------------------------------------------- |
| |
| function Statistical_Op_3 (Data : Data_Collection) return Data_3 is |
| begin |
| return Data_3_Ops.Op (Data); |
| end; |
| |
| end CA11019_0; |
| |
| |
| --=================================================-- |
| |
| with CA11019_0, |
| -- Main, |
| -- Main.Child is private |
| Report; |
| |
| procedure CA11019 is |
| |
| package Main renames CA11019_0; |
| |
| Col_1, |
| Col_2, |
| Col_3 : Main.Data_Collection; |
| |
| begin |
| |
| Report.Test ("CA11019", "Check that body of a (non-generic) package " & |
| "may depend on its private generic child"); |
| |
| -- build a data collection |
| |
| for I in 1 .. 10 loop |
| Main.Add_1 ( Main.Data_1(I), Col_1); |
| end loop; |
| |
| if Main.Statistical_Op_1 (Col_1) /= 10 then |
| Report.Failed ("Wrong data_1 value returned"); |
| end if; |
| |
| for I in reverse 10 .. 20 loop |
| Main.Add_2 ( Main.Data_2(I * 10), Col_2); |
| end loop; |
| |
| if Main.Statistical_Op_2 (Col_2) /= 200 then |
| Report.Failed ("Wrong data_2 value returned"); |
| end if; |
| |
| for I in 0 .. 10 loop |
| Main.Add_3 ( Main.Data_3(I + 5), Col_3); |
| end loop; |
| |
| if Main.Statistical_Op_3 (Col_3) /= 15 then |
| Report.Failed ("Wrong data_3 value returned"); |
| end if; |
| |
| Report.Result; |
| |
| end CA11019; |
