Hello
After the first line box.k is 17. Then a call to 'Salt' changes it to 5 even though box is
an IN parameter, which I thought meant that it could not be changed.
(If box contained POINTERs I knew that the things pointed to could be changed, but
I thought that the (*direct*) contents of box should be read-only.)
Is this a bug? - or just a trap for the unwary?
Regards
Robert
MODULE RdcTestOne;
IMPORT StdLog;
TYPE
Box = RECORD
k : INTEGER
END;
PROCEDURE (VAR box : Box) Pepper, NEW;
BEGIN
box.k := 5
END Pepper;
PROCEDURE (IN box : Box) Salt, NEW;
BEGIN
box.Pepper
END Salt;
PROCEDURE Do*;
VAR
box : Box;
BEGIN
box.k := 17; StdLog.Int (box.k); StdLog.Ln;
box.Salt; StdLog.Int (box.k); StdLog.Ln
END Do;
END RdcTestOne.
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Received on Mon Aug 06 2012 - 16:04:30 UTC