Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!autodesk!glang
From: glang@Autodesk.COM (Gary Lang)
Newsgroups: comp.sys.next
Subject: Re: C++ and <stdio.h> -- Bug report
Message-ID: <2422@autodesk.COM>
Date: 1 Feb 91 04:55:35 GMT
References: <1991Jan28.134211.1497@engage.enet.dec.com>
Distribution: comp
Organization: Autodesk Inc., Sausalito CA, USA
Lines: 60
In-reply-to: tenny@ootool.dec.com's message of 28 Jan 91 13:33:57 GMT

>>NeXT uses the C++ reserved word 'new' in stdio.h!!!!!  I can't believe
>>NeXT didn't catch this!!!  Arrggh.  I guess no one at NeXT actually
>>uses C++.


>I'd like C++ too for my NeXT.  But I'm not holding my breath for it.
>Even when I get 2.0, I know that G++ 1.37.1 has lots of bugs, and I've

This is not a problem with NeXT's stdio.h. This is your problem. This
happens with any mixed language environment. In fact there's a
provision for it that's supported with the cc++ compiler.

Just declare the language that a piece of code uses to the compiler.
For example, in your case...


extern "C"
{
#import <stdio.h>
}

Works like a champ. Similarly for objc headers...

extern "Objective-C"
{
#import <appkit/Window.h>
}

One thing I found out that annoyed me was that id is not declared the
same type as Object *...so if you have code like any good programmer
should that looks like:

self = [ Foo new ];
if ( self == nil )
    errorDoSomething();

It will complain because self and nil aren't the same type (class)
either directly nor transitively in the class hierarchy. id is a
typedef of ther struct objc_object, which has the same structure as
the Object class definition, but isn't defined as the latter, and so
cc++ complains...

Since I code for portability, I never directly include <objc/*.h>
because I'd never place StepStone's headers in such a place;
/usr/include belongs to my compiler on other platforms, and upgrading
the compiler runs the risk of overwriting any clones of the NeXT
directory structure I could come up with. So instead I have a local
header I call objc.cf which, depending on which compiler/platform I'm
on includes the correct objc.h. It also includes the Object category I
defined to emulate the missing StepStone Object interface. So all I
had to do was under nil and define it correctly.

Good luck.

-g
-- 
Gary T. Lang  (415)332-2344 x2702  
Autodesk, Inc.
Sausalito, CA.
MCI: 370-0730