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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;