1-- C52009B.ADA
2
3--                             Grant of Unlimited Rights
4--
5--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
6--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
7--     unlimited rights in the software and documentation contained herein.
8--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
9--     this public release, the Government intends to confer upon all
10--     recipients unlimited rights  equal to those held by the Government.
11--     These rights include rights to use, duplicate, release or disclose the
12--     released technical data and computer software in whole or in part, in
13--     any manner and for any purpose whatsoever, and to have or permit others
14--     to do so.
15--
16--                                    DISCLAIMER
17--
18--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
19--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
20--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
21--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
22--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
23--     PARTICULAR PURPOSE OF SAID MATERIAL.
24--*
25-- CHECK THAT A RECORD VARIABLE DESIGNATED BY AN ACCESS VALUE CANNOT
26-- HAVE ITS DISCRIMINANT ALTERED, EVEN BY A COMPLETE RECORD
27-- ASSIGNMENT, AND EVEN THOUGH THE THE TARGET ACCESS VARIABLE IS NOT
28-- CONSTRAINED TO A SPECIFIC DISCRIMINANT VALUE.  ATTEMPTING TO
29-- CHANGE THE TARGET'S DISCRIMINANT RAISES CONSTRAINT_ERROR AND LEAVES
30-- THE TARGET RECORD UNALTERED.  THIS TEST USES NON-STATIC DISCRIMINANT
31-- VALUES AND A TYPE WITH DEFAULT DISCRIMINANTS.
32
33-- ASL 7/6/81
34-- SPS 10/26/82
35-- JBG 1/10/84
36
37WITH REPORT;
38PROCEDURE C52009B IS
39
40     USE REPORT;
41
42     TYPE REC(DISC : INTEGER := 5) IS
43          RECORD
44               COMP : INTEGER := 0;
45          END RECORD;
46
47     TYPE REC_NAME IS ACCESS REC;
48
49     HR : REC_NAME := NEW REC;
50
51BEGIN
52
53     TEST ("C52009B", "CANNOT CHANGE, THROUGH ASSIGNMENT, THE " &
54           "(DYNAMIC) DISCRIMINANT VALUE OF A RECORD DESIGNATED " &
55           "BY AN ACCESS VALUE");
56
57     BEGIN
58          HR.ALL := (DISC => IDENT_INT(5), COMP => 3);
59          IF HR.ALL /= (IDENT_INT(5),3) THEN
60               FAILED ("LEGAL ASSIGNMENT FAILED");
61          END IF;
62     EXCEPTION
63          WHEN CONSTRAINT_ERROR =>
64               FAILED ("CONSTRAINT_ERROR RAISED WHEN DISCRIMINANT " &
65                       "VALUE NOT CHANGED");
66     END;
67
68     BEGIN
69          HR.ALL := (DISC => IDENT_INT(4), COMP => 2);
70          FAILED ("RECORD ASSIGNED VALUE WITH DIFFERENT DISCRIMINANT " &
71                  "VALUE");
72     EXCEPTION
73          WHEN CONSTRAINT_ERROR =>
74               COMMENT ("DETECTED ATTEMPT TO CHANGE DISCRIMINANT " &
75                        "VALUE");
76          WHEN OTHERS => FAILED ("WRONG EXCEPTION");
77     END;
78
79     RESULT;
80
81END C52009B;
82