How is ABS(-7) a valid reference? It would be valid if B were call by name or call by value, but not for call by reference. Now some compilers would assign the value to a temporary variable, but I question whether that would be call by reference.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List <ASSEMBLER-LIST@listserv.uga.edu> on behalf of Ze'ev Atlas <000001774d97d104-dmarc-requ...@listserv.uga.edu> Sent: Sunday, February 11, 2018 8:29 AM To: ASSEMBLER-LIST@listserv.uga.edu Subject: Re: Man or boy test Now that I have understood the concept of call 'by name', I have a semantically question and I will use some pseudo code to describe it Le's say that I have these function definition FUNC1 (BY NAME A, BY REFERENCE B, BY VALUE C){...} if I do i. RESULT = FUNC1 (RAND (5), MYVARNAME1, 7)or ii. RESULT = FUNC1 (RAND (5), ABS(-7), MYVARNAME2) then it is pretty clear what would happen, MYVARNAME1 would be accessible and open to changes by FUNC1, 7 and MYVARNAME2 would be evaluated once and a copy would be available to FUNC1. And RAND(5) would always be evaluated anew when used. iii. The use of ABS(-7) is more ambiguous here! But, concentrating on the first parameter, the by name one, what would happen if we do something like iv. RESULT = FUNC1 (1, MYVARNAME1, 7)or v. RESULT = FUNC1 (1+5, MYVARNAME1, 7) orvi. RESULT = FUNC1 (MYVARNAME3, MYVARNAME1, 7) My inclination would be that the compiler should flag cases iii through vi as compile time errors (or at least cases iii and vi), but I am afraid that the 'man compiler' gang would jump on me. Ze'ev Atlas On Saturday, February 10, 2018, 9:02:46 PM EST, Ze'ev Atlas <zatl...@yahoo.com> wrote:
