-- CA11020.A
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-- CA11020.A
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--
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--
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-- Grant of Unlimited Rights
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-- Grant of Unlimited Rights
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--
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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-- to do so.
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--
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--
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-- DISCLAIMER
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-- DISCLAIMER
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--
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--*
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--
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--
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-- OBJECTIVE:
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-- OBJECTIVE:
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-- Check that body of the generic parent package can depend on one of
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-- Check that body of the generic parent package can depend on one of
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-- its own public generic children.
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-- its own public generic children.
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--
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--
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-- TEST DESCRIPTION:
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-- TEST DESCRIPTION:
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-- A scenario is created that demonstrates the potential of adding a
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-- A scenario is created that demonstrates the potential of adding a
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-- public generic child during code maintenance without distubing a large
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-- public generic child during code maintenance without distubing a large
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-- subsystem. After child is added to the subsystem, a maintainer
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-- subsystem. After child is added to the subsystem, a maintainer
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-- decides to take advantage of the new functionality and rewrites
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-- decides to take advantage of the new functionality and rewrites
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-- the parent's body.
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-- the parent's body.
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--
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--
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-- Declare a bag abstraction in a generic package. Declare a public
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-- Declare a bag abstraction in a generic package. Declare a public
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-- generic child of this package which adds a generic procedure to the
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-- generic child of this package which adds a generic procedure to the
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-- original subsystem. In the parent body, instantiate the public
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-- original subsystem. In the parent body, instantiate the public
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-- child. Then instantiate the procedure as a child instance of the
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-- child. Then instantiate the procedure as a child instance of the
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-- public child instance.
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-- public child instance.
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--
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--
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-- In the main program, declare an instance of parent. Check that the
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-- In the main program, declare an instance of parent. Check that the
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-- operations in both parent and child packages perform as expected.
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-- operations in both parent and child packages perform as expected.
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--
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--
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--
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--
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-- CHANGE HISTORY:
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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-- 06 Dec 94 SAIC ACVC 2.0
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--
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--
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--!
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--!
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-- Simulates bag application.
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-- Simulates bag application.
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generic
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generic
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type Element is private;
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type Element is private;
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with function Image (E : Element) return String;
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with function Image (E : Element) return String;
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package CA11020_0 is
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package CA11020_0 is
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type Bag is limited private;
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type Bag is limited private;
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procedure Add (E : in Element; To_The_Bag : in out Bag);
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procedure Add (E : in Element; To_The_Bag : in out Bag);
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function Bag_Image (B : Bag) return string;
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function Bag_Image (B : Bag) return string;
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private
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private
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type Node_Type;
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type Node_Type;
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type Bag is access Node_Type;
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type Bag is access Node_Type;
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type Node_Type is
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type Node_Type is
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record
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record
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The_Element : Element;
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The_Element : Element;
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-- Other components in real application, i.e.,
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-- Other components in real application, i.e.,
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-- The_Count : positive;
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-- The_Count : positive;
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Next : Bag;
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Next : Bag;
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end record;
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end record;
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end CA11020_0;
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end CA11020_0;
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--==================================================================--
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--==================================================================--
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-- More operations on Bag.
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-- More operations on Bag.
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generic
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generic
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-- Parameters go here.
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-- Parameters go here.
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package CA11020_0.CA11020_1 is
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package CA11020_0.CA11020_1 is
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-- ... Other declarations.
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-- ... Other declarations.
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generic -- Generic iterator procedure.
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generic -- Generic iterator procedure.
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with procedure Use_Element (E : in Element);
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with procedure Use_Element (E : in Element);
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procedure Iterate (B : in Bag); -- Called once per element in the bag.
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procedure Iterate (B : in Bag); -- Called once per element in the bag.
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-- ... Various other operations.
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-- ... Various other operations.
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end CA11020_0.CA11020_1;
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end CA11020_0.CA11020_1;
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--==================================================================--
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--==================================================================--
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package body CA11020_0.CA11020_1 is
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package body CA11020_0.CA11020_1 is
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procedure Iterate (B : in Bag) is
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procedure Iterate (B : in Bag) is
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-- Traverse each element in the bag.
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-- Traverse each element in the bag.
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Elem : Bag := B;
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Elem : Bag := B;
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begin
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begin
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while Elem /= null loop
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while Elem /= null loop
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Use_Element (Elem.The_Element);
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Use_Element (Elem.The_Element);
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Elem := Elem.Next;
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Elem := Elem.Next;
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end loop;
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end loop;
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end Iterate;
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end Iterate;
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end CA11020_0.CA11020_1;
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end CA11020_0.CA11020_1;
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--==================================================================--
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--==================================================================--
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with CA11020_0.CA11020_1; -- Public generic child package.
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with CA11020_0.CA11020_1; -- Public generic child package.
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package body CA11020_0 is
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package body CA11020_0 is
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----------------------------------------------------
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----------------------------------------------------
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-- Parent's body depends on public generic child. --
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-- Parent's body depends on public generic child. --
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----------------------------------------------------
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----------------------------------------------------
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-- Instantiate the public child.
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-- Instantiate the public child.
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package MS is new CA11020_1;
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package MS is new CA11020_1;
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function Bag_Image (B : Bag) return string is
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function Bag_Image (B : Bag) return string is
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Buffer : String (1 .. 10_000);
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Buffer : String (1 .. 10_000);
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Last : Integer := 0;
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Last : Integer := 0;
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-----------------------------------------------------
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-----------------------------------------------------
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-- Will be called by the iterator.
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-- Will be called by the iterator.
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procedure Append_Image (E : in Element) is
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procedure Append_Image (E : in Element) is
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Im : constant String := Image (E);
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Im : constant String := Image (E);
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begin -- Append_Image
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begin -- Append_Image
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if Last /= 0 then -- Insert a comma.
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if Last /= 0 then -- Insert a comma.
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Last := Last + 1;
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Last := Last + 1;
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Buffer (Last) := ',';
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Buffer (Last) := ',';
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end if;
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end if;
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Buffer (Last + 1 .. Last + Im'Length) := Im;
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Buffer (Last + 1 .. Last + Im'Length) := Im;
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Last := Last + Im'Length;
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Last := Last + Im'Length;
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end Append_Image;
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end Append_Image;
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-----------------------------------------------------
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-----------------------------------------------------
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-- Instantiate procedure Iterate as a child of instance MS.
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-- Instantiate procedure Iterate as a child of instance MS.
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procedure Append_All is new MS.Iterate (Use_Element => Append_Image);
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procedure Append_All is new MS.Iterate (Use_Element => Append_Image);
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begin -- Bag_Image
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begin -- Bag_Image
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Append_All (B);
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Append_All (B);
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return Buffer (1 .. Last);
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return Buffer (1 .. Last);
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end Bag_Image;
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end Bag_Image;
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-----------------------------------------------------
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-----------------------------------------------------
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procedure Add (E : in Element; To_The_Bag : in out Bag) is
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procedure Add (E : in Element; To_The_Bag : in out Bag) is
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-- Not a real bag addition.
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-- Not a real bag addition.
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Index : Bag := To_The_Bag;
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Index : Bag := To_The_Bag;
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begin
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begin
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-- ... Error-checking code omitted for brevity.
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-- ... Error-checking code omitted for brevity.
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if Index = null then
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if Index = null then
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To_The_Bag := new Node_Type' (The_Element => E,
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To_The_Bag := new Node_Type' (The_Element => E,
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Next => null);
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Next => null);
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else
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else
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-- Goto the end of the list.
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-- Goto the end of the list.
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while Index.Next /= null loop
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while Index.Next /= null loop
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Index := Index.Next;
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Index := Index.Next;
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end loop;
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end loop;
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-- Add element to the end of the list.
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-- Add element to the end of the list.
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Index.Next := new Node_Type' (The_Element => E,
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Index.Next := new Node_Type' (The_Element => E,
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Next => null);
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Next => null);
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end if;
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end if;
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end Add;
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end Add;
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end CA11020_0;
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end CA11020_0;
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--==================================================================--
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--==================================================================--
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with CA11020_0; -- Bag application.
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with CA11020_0; -- Bag application.
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with Report;
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with Report;
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procedure CA11020 is
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procedure CA11020 is
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-- Instantiate the bag application for integer type and attribute
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-- Instantiate the bag application for integer type and attribute
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-- Image.
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-- Image.
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package Bag_Of_Integers is new CA11020_0 (Integer, Integer'Image);
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package Bag_Of_Integers is new CA11020_0 (Integer, Integer'Image);
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My_Bag : Bag_Of_Integers.Bag;
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My_Bag : Bag_Of_Integers.Bag;
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begin
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begin
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Report.Test ("CA11020", "Check that body of the generic parent package " &
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Report.Test ("CA11020", "Check that body of the generic parent package " &
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"can depend on one of its own public generic children");
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"can depend on one of its own public generic children");
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-- Add 10 consecutive integers to the bag.
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-- Add 10 consecutive integers to the bag.
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for I in 1 .. 10 loop
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for I in 1 .. 10 loop
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Bag_Of_Integers.Add (I, My_Bag);
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Bag_Of_Integers.Add (I, My_Bag);
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end loop;
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end loop;
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if Bag_Of_Integers.Bag_Image (My_Bag)
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if Bag_Of_Integers.Bag_Image (My_Bag)
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/= " 1, 2, 3, 4, 5, 6, 7, 8, 9, 10" then
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/= " 1, 2, 3, 4, 5, 6, 7, 8, 9, 10" then
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Report.Failed ("Incorrect results");
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Report.Failed ("Incorrect results");
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end if;
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end if;
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Report.Result;
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Report.Result;
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end CA11020;
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end CA11020;
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