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-- C390010.A

--

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--     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

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--

-- OBJECTIVE:

--     Check that if S is a subtype of a tagged type T, and if S is

--     constrained, then the allowable values of S'Class are only those

--     that, when converted to T, belong to S.

--

-- TEST DESCRIPTION:

--      This test defines a small tagged hierarchy of discriminated tagged

--      records, and constrained subtypes of those tagged record types.

--      It then uses access to the classwide of the constrained subtype

--      to check the objective.

--

--

-- CHANGE HISTORY:

--      09 APR 96   SAIC   Initial version

--      03 NOV 96   SAIC   Revised for 2.1 release

--      31 DEC 97   EDS    Restored use of intermediate access variable

--                         to eliminate raising of Program_Error

--      13 SEP 99   RLB    Repaired previous change to avoid premature

--                         subtype check.

--      28 JUN 02   RLB    Added pragma Elaborate_All (Report);.

--!

----------------------------------------------------------------- C390010_0

with Report; pragma Elaborate_All (Report);

package C390010_0 is

  -- the defined subprograms will allow checking the placement of

  -- constraint_checks

  -- define a discriminated tagged type, and a constrained subtype of

  -- that type:

  type Discr_Tag_Record( Disc: Boolean ) is tagged record

    FieldA : Character := 'A';

    case Disc is

      when True  => FieldB : Character := 'B';

      when False => FieldC : Character := 'C';

    end case;

  end record;

  procedure Dispatching_Op( DTO : in out Discr_Tag_Record );

  Authentic : Boolean := Report.Ident_Bool( True );

  subtype True_Record is Discr_Tag_Record( Authentic );

  -- derive a type, "passing through" one discriminant, adding one

  -- discriminant, and a constrained subtype of THAT type:

  type Derived_Record( Disc1, Disc2: Boolean ) is

    new Discr_Tag_Record( Disc1 ) with record

      FieldD : Character := 'D';

      case Disc2 is

        when True  => FieldE : Character := 'E';

        when False => FieldF : Character := 'F';

      end case;

    end record;

  procedure Dispatching_Op( DR : in out Derived_Record );

  subtype True_True_Derived is Derived_Record( Authentic, Authentic );

  -- now, define an access to classwide type, using the classwide from the

  -- constrained subtype of the root (or parent) type:

  type Subtype_Parent_Class_Access is access all True_Record'Class;

  type Parent_Class_Access is access all Discr_Tag_Record'Class;

  procedure PCW_Op( SPCA : in Subtype_Parent_Class_Access );

end C390010_0;

-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- C390010_0

with Report;

with TCTouch;

package body C390010_0 is

  procedure Dispatching_Op( DTO : in out Discr_Tag_Record ) is

  begin

    TCTouch.Touch('1');  --------------------------------------------------- 1

    if DTO.Disc then

      TCTouch.Touch(DTO.FieldB);  ------------------------------------------ B

    else

      TCTouch.Touch(DTO.FieldC);  ------------------------------------------ C

    end if;

  end Dispatching_Op;

  procedure Dispatching_Op( DR : in out Derived_Record ) is

  begin

    TCTouch.Touch('2');  --------------------------------------------------- 2

    if DR.Disc1 then

      TCTouch.Touch(DR.FieldB);   ------------------------------------------ B

    else

      TCTouch.Touch(DR.FieldC);   ------------------------------------------ C

    end if;

    if DR.Disc2 then

      TCTouch.Touch(DR.FieldE);   ------------------------------------------ E

    else

      TCTouch.Touch(DR.FieldF);   ------------------------------------------ F

    end if;

  end Dispatching_Op;

  procedure PCW_Op( SPCA : in Subtype_Parent_Class_Access ) is

  begin

    -- the following line is the "heart" of this test, objects of all types

    -- covered by the classwide type will be passed to this subprogram in

    -- the execution of the test.

    if SPCA.Disc then

      TCTouch.Touch(SPCA.FieldB); ------------------------------------------ B

    else

      TCTouch.Touch(SPCA.FieldC); ------------------------------------------ C

    end if;

    Dispatching_Op( SPCA.all );  -- check that this dispatches correctly,

                                 -- with discriminants correctly represented

  end PCW_Op;

end C390010_0;

------------------------------------------------------------------- C390010

with Report;

with TCTouch;

with C390010_0;

procedure C390010 is

  package CP renames C390010_0;

  procedure Check_Element( Item : access CP.Discr_Tag_Record'Class ) is

  begin

    -- the implicit conversion from the general access parameter to the more

    -- constrained subtype access type in the following call should cause

    -- Constraint_Error in the cases where the object is not correctly

    -- constrained

    CP.PCW_Op( Item.all'Access );

  exception

    when Constraint_Error => TCTouch.Touch('X');  -------------------------- X

    when others => Report.Failed("Unanticipated exception in Check_Element");

  end Check_Element;

  An_Item : CP.Parent_Class_Access;

begin  -- Main test procedure.

  Report.Test ("C390010", "Check that if S is a subtype of a tagged type " &

                          "T, and if S is constrained, then the allowable " &

                          "values of S'Class are only those that, when " &

                          "converted to T, belong to S" );

  An_Item := new CP.Discr_Tag_Record(True);

  Check_Element( An_Item );

  TCTouch.Validate("B1B","Case 1");

  An_Item := new CP.Discr_Tag_Record(False);

  Check_Element( An_Item );

  TCTouch.Validate("X","Case 2");

  An_Item := new CP.True_Record;

  Check_Element( An_Item );

  TCTouch.Validate("B1B","Case 3");

  An_Item := new CP.Derived_Record(False, False);

  Check_Element( An_Item );

  TCTouch.Validate("X","Case 4");

  An_Item := new CP.Derived_Record(False, True);

  Check_Element( An_Item );

  TCTouch.Validate("X","Case 5");

  An_Item := new CP.Derived_Record(True, False);

  Check_Element( An_Item );

  TCTouch.Validate("B2BF","Case 6");

  An_Item := new CP.True_True_Derived;

  Check_Element( An_Item );

  TCTouch.Validate("B2BE","Case 7");

  Report.Result;

end C390010;