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+-- C340001.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 user-defined equality operators are inherited by a
+-- derived type except when the derived type is a nonlimited record
+-- extension. In the latter case, ensure that the primitive
+-- equality operation of the record extension compares any extended
+-- components according to the predefined equality operators of the
+-- component types. Also check that the parent portion of the extended
+-- type is compared using the user-defined equality operation of the
+-- parent type.
+--
+-- TEST DESCRIPTION:
+-- Declares a nonlimited tagged record and a limited tagged record
+-- type, each in a separate package. A user-defined "=" operation is
+-- defined for each type. Each type is extended with one new record
+-- component added.
+--
+-- Objects are declared for each parent and extended types and are
+-- assigned values. For the limited type, modifier operations defined
+-- in the package are used to assign values.
+--
+-- To verify the use of the user-defined "=", values are assigned so
+-- that predefined equality will return the opposite result if called.
+-- Similarly, values are assigned to the extended type objects so that
+-- one comparison will verify that the inherited components from the
+-- parent are compared using the user-defined equality operation.
+--
+-- A second comparison sets the values of the inherited components to
+-- be the same so that equality based on the extended component may be
+-- verified. For the nonlimited type, the test for equality should
+-- fail, as the "=" defined for this type should include testing
+-- equality of the extended component. For the limited type, "=" of the
+-- parent should be inherited as-is, so the test for equality should
+-- succeed even though the records differ in the extended component.
+--
+-- A third package declares a discriminated tagged record. Equality
+-- is user-defined and ignores the discriminant value. A type
+-- extension is declared which also contains a discriminant. Since
+-- an inherited discriminant may not be referenced other than in a
+-- "new" discriminant, the type extension is also discriminated. The
+-- discriminant is used as the constraint for the parent type.
+--
+-- A variant part is declared in the type extension based on the new
+-- discriminant. Comparisons are made to confirm that the user-defined
+-- equality operator is used to compare values of the type extension.
+-- Two record objects are given values so that user-defined equality
+-- for the parent portion of the record succeeds, but the variant
+-- parts in the type extended object differ. These objects are checked
+-- to ensure that they are not equal.
+--
+--
+-- CHANGE HISTORY:
+-- 06 Dec 94 SAIC ACVC 2.0
+-- 19 Dec 94 SAIC Removed RM references from objective text.
+--
+--!
+
+with Ada.Calendar;
+package C340001_0 is
+
+ type DB_Record is tagged record
+ Key : Natural range 1 .. 9999;
+ Data : String (1..10);
+ end record;
+
+ function "=" (L, R : in DB_Record) return Boolean;
+
+ type Dated_Record is new DB_Record with record
+ Retrieval_Time : Ada.Calendar.Time;
+ end record;
+
+end C340001_0;
+
+package body C340001_0 is
+
+ function "=" (L, R : in DB_Record) return Boolean is
+ -- Key is ignored in determining equality of records
+ begin
+ return L.Data = R.Data;
+ end "=";
+
+end C340001_0;
+
+package C340001_1 is
+
+ type List_Contents is array (1..10) of Integer;
+ type List is tagged limited record
+ Length : Natural range 0..10 := 0;
+ Contents : List_Contents := (others => 0);
+ end record;
+
+ procedure Add_To (L : in out List; New_Value : in Integer);
+ procedure Remove_From (L : in out List);
+
+ function "=" (L, R : in List) return Boolean;
+
+ subtype Revision_Mark is Character range 'A' .. 'Z';
+ type Revisable_List is new List with record
+ Revision : Revision_Mark := 'A';
+ end record;
+
+ procedure Revise (L : in out Revisable_List);
+
+end C340001_1;
+
+package body C340001_1 is
+
+ -- Note: This is not a complete abstraction of a list. Exceptions
+ -- are not defined and boundary checks are not made.
+
+ procedure Add_To (L : in out List; New_Value : in Integer) is
+ begin
+ L.Length := L.Length + 1;
+ L.Contents (L.Length) := New_Value;
+ end Add_To;
+
+ procedure Remove_From (L : in out List) is
+ -- The list length is decremented. "Old" values are left in the
+ -- array. They are overwritten when a new value is added.
+ begin
+ L.Length := L.Length - 1;
+ end Remove_From;
+
+ function "=" (L, R : in List) return Boolean is
+ -- Two lists are equal if they are the same length and
+ -- the component values within that length are the same.
+ -- Values stored past the end of the list are ignored.
+ begin
+ return L.Length = R.Length
+ and then L.Contents (1..L.Length) = R.Contents (1..R.Length);
+ end "=";
+
+ procedure Revise (L : in out Revisable_List) is
+ begin
+ L.Revision := Character'Succ (L.Revision);
+ end Revise;
+
+end C340001_1;
+
+package C340001_2 is
+
+ type Media is (Paper, Electronic);
+
+ type Transaction (Medium : Media) is tagged record
+ ID : Natural range 1000 .. 9999;
+ end record;
+
+ function "=" (L, R : in Transaction) return Boolean;
+
+ type Authorization (Kind : Media) is new Transaction (Medium => Kind)
+ with record
+ case Kind is
+ when Paper =>
+ Signature_On_File : Boolean;
+ when Electronic =>
+ Paper_Backup : Boolean; -- to retain opposing value
+ end case;
+ end record;
+
+end C340001_2;
+
+package body C340001_2 is
+
+ function "=" (L, R : in Transaction) return Boolean is
+ -- There may be electronic and paper copies of the same transaction.
+ -- The ID uniquely identifies a transaction. The medium (stored in
+ -- the discriminant) is ignored.
+ begin
+ return L.ID = R.ID;
+ end "=";
+
+end C340001_2;
+
+
+with C340001_0; -- nonlimited tagged record declarations
+with C340001_1; -- limited tagged record declarations
+with C340001_2; -- tagged variant declarations
+with Ada.Calendar;
+with Report;
+procedure C340001 is
+
+ DB_Rec1 : C340001_0.DB_Record := (Key => 1,
+ Data => "aaaaaaaaaa");
+ DB_Rec2 : C340001_0.DB_Record := (Key => 55,
+ Data => "aaaaaaaaaa");
+ -- DB_Rec1 = DB_Rec2 using user-defined equality
+ -- DB_Rec1 /= DB_Rec2 using predefined equality
+
+ Some_Time : Ada.Calendar.Time :=
+ Ada.Calendar.Time_Of (Month => 9, Day => 16, Year => 1993);
+
+ Another_Time : Ada.Calendar.Time :=
+ Ada.Calendar.Time_Of (Month => 9, Day => 19, Year => 1993);
+
+ Dated_Rec1 : C340001_0.Dated_Record := (Key => 2,
+ Data => "aaaaaaaaaa",
+ Retrieval_Time => Some_Time);
+ Dated_Rec2 : C340001_0.Dated_Record := (Key => 77,
+ Data => "aaaaaaaaaa",
+ Retrieval_Time => Some_Time);
+ Dated_Rec3 : C340001_0.Dated_Record := (Key => 77,
+ Data => "aaaaaaaaaa",
+ Retrieval_Time => Another_Time);
+ -- Dated_Rec1 = Dated_Rec2 if DB_Record."=" used for parent portion
+ -- Dated_Rec2 /= Dated_Rec3 if extended component is compared
+ -- using Ada.Calendar.Time."="
+
+ List1 : C340001_1.List;
+ List2 : C340001_1.List;
+
+ RList1 : C340001_1.Revisable_List;
+ RList2 : C340001_1.Revisable_List;
+ RList3 : C340001_1.Revisable_List;
+
+ Current : C340001_2.Transaction (C340001_2.Paper) :=
+ (C340001_2.Paper, 2001);
+ Last : C340001_2.Transaction (C340001_2.Electronic) :=
+ (C340001_2.Electronic, 2001);
+ -- Current = Last using user-defined equality
+ -- Current /= Last using predefined equality
+
+ Approval1 : C340001_2.Authorization (C340001_2.Paper)
+ := (Kind => C340001_2.Paper,
+ ID => 1040,
+ Signature_On_File => True);
+ Approval2 : C340001_2.Authorization (C340001_2.Paper)
+ := (Kind => C340001_2.Paper,
+ ID => 2167,
+ Signature_On_File => False);
+ Approval3 : C340001_2.Authorization (C340001_2.Electronic)
+ := (Kind => C340001_2.Electronic,
+ ID => 2167,
+ Paper_Backup => False);
+ -- Approval1 /= Approval2 if user-defined equality extended with
+ -- component equality.
+ -- Approval2 /= Approval3 if differing variant parts checked
+
+ -- Direct visibility to operator symbols
+ use type C340001_0.DB_Record;
+ use type C340001_0.Dated_Record;
+
+ use type C340001_1.List;
+ use type C340001_1.Revisable_List;
+
+ use type C340001_2.Transaction;
+ use type C340001_2.Authorization;
+
+begin
+
+ Report.Test ("C340001", "Inheritance of user-defined ""=""");
+
+ -- Approval1 /= Approval2 if user-defined equality extended with
+ -- component equality.
+ -- Approval2 /= Approval3 if differing variant parts checked
+
+ ---------------------------------------------------------------------
+ -- Check that "=" and "/=" for the parent type call the user-defined
+ -- operation
+ ---------------------------------------------------------------------
+
+ if not (DB_Rec1 = DB_Rec2) then
+ Report.Failed ("Nonlimited tagged record: " &
+ "User-defined equality did not override predefined " &
+ "equality");
+ end if;
+
+ if DB_Rec1 /= DB_Rec2 then
+ Report.Failed ("Nonlimited tagged record: " &
+ "User-defined equality did not override predefined " &
+ "inequality as well");
+ end if;
+
+ ---------------------------------------------------------------------
+ -- Check that "=" and "/=" for the type extension use the user-defined
+ -- equality operations from the parent to compare the inherited
+ -- components
+ ---------------------------------------------------------------------
+
+ if not (Dated_Rec1 = Dated_Rec2) then
+ Report.Failed ("Nonlimited tagged record: " &
+ "User-defined equality was not used to compare " &
+ "components inherited from parent");
+ end if;
+
+ if Dated_Rec1 /= Dated_Rec2 then
+ Report.Failed ("Nonlimited tagged record: " &
+ "User-defined inequality was not used to compare " &
+ "components inherited from parent");
+ end if;
+
+ ---------------------------------------------------------------------
+ -- Check that equality and inequality for the type extension incorporate
+ -- the predefined equality operators for the extended component type
+ ---------------------------------------------------------------------
+ if Dated_Rec2 = Dated_Rec3 then
+ Report.Failed ("Nonlimited tagged record: " &
+ "Record equality was not extended with component " &
+ "equality");
+ end if;
+
+ if not (Dated_Rec2 /= Dated_Rec3) then
+ Report.Failed ("Nonlimited tagged record: " &
+ "Record inequality was not extended with component " &
+ "equality");
+ end if;
+
+ ---------------------------------------------------------------------
+ C340001_1.Add_To (List1, 1);
+ C340001_1.Add_To (List1, 2);
+ C340001_1.Add_To (List1, 3);
+ C340001_1.Remove_From (List1);
+
+ C340001_1.Add_To (List2, 1);
+ C340001_1.Add_To (List2, 2);
+
+ -- List1 contents are (2, (1, 2, 3, 0, 0, 0, 0, 0, 0, 0))
+ -- List2 contents are (2, (1, 2, 0, 0, 0, 0, 0, 0, 0, 0))
+
+ -- List1 = List2 using user-defined equality
+ -- List1 /= List2 using predefined equality
+
+ ---------------------------------------------------------------------
+ -- Check that "=" and "/=" for the parent type call the user-defined
+ -- operation
+ ---------------------------------------------------------------------
+ if not (List1 = List2) then
+ Report.Failed ("Limited tagged record : " &
+ "User-defined equality incorrectly implemented " );
+ end if;
+
+ if List1 /= List2 then
+ Report.Failed ("Limited tagged record : " &
+ "User-defined equality incorrectly implemented " );
+ end if;
+
+ ---------------------------------------------------------------------
+ -- RList1 and RList2 are made equal but "different" by adding
+ -- a nonzero value to RList1 then removing it. Removal updates
+ -- the list Length only, not its contents. The two lists will be
+ -- equal according to the defined list abstraction, but the records
+ -- will contain differing component values.
+
+ C340001_1.Add_To (RList1, 1);
+ C340001_1.Add_To (RList1, 2);
+ C340001_1.Add_To (RList1, 3);
+ C340001_1.Remove_From (RList1);
+
+ C340001_1.Add_To (RList2, 1);
+ C340001_1.Add_To (RList2, 2);
+
+ C340001_1.Add_To (RList3, 1);
+ C340001_1.Add_To (RList3, 2);
+
+ C340001_1.Revise (RList3);
+
+ -- RList1 contents are (2, (1, 2, 3, 0, 0, 0, 0, 0, 0, 0), 'A')
+ -- RList2 contents are (2, (1, 2, 0, 0, 0, 0, 0, 0, 0, 0), 'A')
+ -- RList3 contents are (2, (1, 2, 0, 0, 0, 0, 0, 0, 0, 0), 'B')
+
+ -- RList1 = RList2 if List."=" inherited
+ -- RList2 /= RList3 if List."=" inherited and extended with Character "="
+
+ ---------------------------------------------------------------------
+ -- Check that "=" and "/=" are the user-defined operations inherited
+ -- from the parent type.
+ ---------------------------------------------------------------------
+ if not (RList1 = RList2) then
+ Report.Failed ("Limited tagged record : " &
+ "User-defined equality was not inherited");
+ end if;
+
+ if RList1 /= RList2 then
+ Report.Failed ("Limited tagged record : " &
+ "User-defined inequality was not inherited");
+ end if;
+ ---------------------------------------------------------------------
+ -- Check that "=" and "/=" for the type extension are NOT extended
+ -- with the predefined equality operators for the extended component.
+ -- A limited type extension should inherit the parent equality operation
+ -- as is.
+ ---------------------------------------------------------------------
+ if not (RList2 = RList3) then
+ Report.Failed ("Limited tagged record : " &
+ "Inherited equality operation was extended with " &
+ "component equality");
+ end if;
+
+ if RList2 /= RList3 then
+ Report.Failed ("Limited tagged record : " &
+ "Inherited inequality operation was extended with " &
+ "component equality");
+ end if;
+
+ ---------------------------------------------------------------------
+ -- Check that "=" and "/=" for the parent type call the user-defined
+ -- operation
+ ---------------------------------------------------------------------
+ if not (Current = Last) then
+ Report.Failed ("Variant record : " &
+ "User-defined equality did not override predefined " &
+ "equality");
+ end if;
+
+ if Current /= Last then
+ Report.Failed ("Variant record : " &
+ "User-defined inequality did not override predefined " &
+ "inequality");
+ end if;
+
+ ---------------------------------------------------------------------
+ -- Check that user-defined equality was incorporated and extended
+ -- with equality of extended components.
+ ---------------------------------------------------------------------
+ if not (Approval1 /= Approval2) then
+ Report.Failed ("Variant record : " &
+ "Inequality was not extended with component " &
+ "inequality");
+ end if;
+
+ if Approval1 = Approval2 then
+ Report.Failed ("Variant record : " &
+ "Equality was not extended with component " &
+ "equality");
+ end if;
+
+ ---------------------------------------------------------------------
+ -- Check that equality and inequality for the type extension
+ -- succeed despite the presence of differing variant parts.
+ ---------------------------------------------------------------------
+ if Approval2 = Approval3 then
+ Report.Failed ("Variant record : " &
+ "Equality succeeded even though variant parts " &
+ "in type extension differ");
+ end if;
+
+ if not (Approval2 /= Approval3) then
+ Report.Failed ("Variant record : " &
+ "Inequality failed even though variant parts " &
+ "in type extension differ");
+ end if;
+
+ ---------------------------------------------------------------------
+ Report.Result;
+ ---------------------------------------------------------------------
+
+end C340001;