1-- C87B44A.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 OVERLOADING RESOLUTION USES THE RULE THAT:
26--
27-- THE TYPE OF THE EXPRESSION IN A RETURN STATEMENT MUST MATCH THE
28-- EXPLICIT TYPEMARK IN THE RETURN CLAUSE OF THE FUNCTION'S
29-- SPECIFICATION.
30--
31-- THE FOUR KINDS OF EXPRESSIONS TESTED HERE ARE:
32--
33--    (A): A CALL TO AN OVERLOADED FUNCTION.
34--    (B): AN OVERLOADED OPERATOR SYMBOL.
35--    (C): AN OVERLOADED (INFIX) OPERATOR.
36--    (D): AN OVERLOADED ENUMERATION LITERAL.
37
38-- TRH  25 JUNE 82
39
40WITH REPORT; USE REPORT;
41
42PROCEDURE C87B44A IS
43
44     TYPE WHOLE  IS NEW INTEGER RANGE 0..INTEGER'LAST;
45     TYPE CITRUS IS (LEMON, LIME, ORANGE);
46     TYPE HUE    IS (RED, ORANGE, YELLOW);
47
48     FUNCTION F1 (X, Y : INTEGER) RETURN INTEGER IS
49     BEGIN
50          RETURN -1;
51     END F1;
52
53     FUNCTION "*" (X, Y : WHOLE) RETURN WHOLE IS
54     BEGIN
55          RETURN 0;
56     END "*";
57
58     FUNCTION "*" (X, Y : INTEGER) RETURN HUE IS
59     BEGIN
60          RETURN ORANGE;
61     END "*";
62
63     FUNCTION F1 (X, Y : INTEGER) RETURN CITRUS IS
64     BEGIN
65          RETURN ORANGE;
66     END F1;
67
68BEGIN
69     TEST ("C87B44A","OVERLOADED EXPRESSIONS IN RETURN STATEMENTS");
70     DECLARE
71
72          FUNCTION F2 (X, Y : INTEGER) RETURN INTEGER IS
73          BEGIN
74               RETURN F1 (X, Y);
75          END F2;
76
77          FUNCTION F2 (X, Y : WHOLE) RETURN WHOLE IS
78          BEGIN
79               RETURN "*" (X, Y);
80          END F2;
81
82          FUNCTION F2 (X, Y : INTEGER) RETURN HUE IS
83          BEGIN
84               RETURN (X * Y);
85          END F2;
86
87          FUNCTION F2 (X, Y : INTEGER) RETURN CITRUS IS
88          BEGIN
89               RETURN ORANGE;
90          END F2;
91
92
93     BEGIN
94          IF INTEGER'(F2 (0, 0)) /= -1 THEN
95             FAILED ("(A): RESOLUTION INCORRECT - FUNCTION CALL");
96          END IF;
97
98          IF WHOLE'(F2 (0, 0)) /= 0 THEN
99             FAILED ("(B): RESOLUTION INCORRECT - OPERATOR SYMBOL");
100          END IF;
101
102          IF HUE'POS (F2 (0, 0)) /= 1 THEN
103             FAILED ("(C): RESOLUTION INCORRECT - INFIX OPERATOR");
104          END IF;
105
106          IF CITRUS'POS (F2 (0, 0)) /= 2 THEN
107             FAILED ("(D): RESOLUTION INCORRECT - ENUMERATION LITERAL");
108          END IF;
109     END;
110
111     RESULT;
112END C87B44A;
113