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From: lagache@violet.berkeley.edu (Edouard Lagache)
Newsgroups: comp.lang.fortran
Subject: FORTRAN value passed parameters revisited
Message-ID: <5359@jade.BERKELEY.EDU>
Date: Thu, 8-Oct-87 12:00:24 EDT
Article-I.D.: jade.5359
Posted: Thu Oct  8 12:00:24 1987
Date-Received: Sun, 11-Oct-87 08:41:59 EDT
Sender: usenet@jade.BERKELEY.EDU
Reply-To: lagache@violet.berkeley.edu (Edouard Lagache)
Organization: University of California, Berkeley
Lines: 19
Keywords: Value passed, f77


    A few days ago I pointed out a dirty trick that ought to make
    if possible to have the effect of value passed parameters in FORTRAN.
    Because this is a Kluge of the first degree, it is very implementation
    dependant and shouldn't be used as normal practice, but I would think
    that is a useful fact to know for desperate emergencies.

    I recieved mail to this effect from several people (whom I thank for
    reminding me of exactly how dirty this trick is), but I also recieved
    a message that it doesn't work under some cases.  Apparantly, the f77
    compiler "sees" through the 'X+0' trick and makes X a variable pass
    parameter.  However, just wrapping an extra set of parantheses does
    seem to do the trick.

    It might be interesting to see what must be done to "tickle" various
    FORTRAN compilers to give value passed parameters.

                                            Edouard Lagache
                                            lagache@violet.berkeley.edu