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From: lanett.mark@f20.n226.z1.FIDONET.ORG (lanett mark)
Newsgroups: comp.sys.mac.programmer
Subject: Methods overriding global functions
Message-ID: <677.2783DF3B@busker.fidonet.org>
Date: 30 Dec 90 12:44:53 GMT
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Lines: 57

Reply-To: ml27192@uxa.cso.uiuc.edu

I'm writing a program using MacApp that for various reasons uses the generic
pascal i/o routines like open/close. When I try to call close from a method
of a TDocument class the compiler flags an error. The problem is that TDoc
_already_ has a method called close, with no arguments, and the compiler is
trying to use that one instead of the generic close. I am not using Self, 
either. I could make the file reference variable a global, and call a special
globasl function to close it (which would not be in TDoc), but I'd like to
know if there's any way to avoid this sort of thing in the first place. For
that
matter, why the h*** did Apple give a method a name that would cause this kind
of conflict. Yes, I know you don't normally use standard pascal i/o, but I
don't really want to rewrite the existing code that does it.

Example: I know this won't work. The trouble is it doesn't compile, though it
should. How do you get the compiler to use the regular close?

program sample (input, output);
 
type
        foo = object
                procedure run;
                procedure close;
        end;
 
procedure foo.run;
 
        var z: text;
        
        begin
                close (z); (* *** Compiler wants to use foo.close (no args)
*)
        end;
 
procedure foo.close;
 
        begin
                writeln ('closing');
        end;
 
var a: foo;
        
begin
        new (a);
        a.run;
end.

Thanks much,
Mark Lanett, ml27192@uxa.cs.uiuc.edu

 + Organization: University of Illinois at Urbana

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