Xref: utzoo gnu.g++.help:701 comp.lang.c++:12878
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!tut.cis.ohio-state.edu!unreplyable!garbage
From: applga!mcginnis@SHARKEY.CC.UMICH.EDU (Brian McGinnis)
Newsgroups: gnu.g++.help,comp.lang.c++
Subject: (none)
Message-ID: <9104151536.AA03587@applga.aa.cad.slb.com>
Date: 15 Apr 91 15:36:01 GMT
Sender: daemon@tut.cis.ohio-state.edu
Followup-To: gnu.g++.help
Distribution: world
Organization: Gatewayed from the GNU Project mailing list help-g++@prep.ai.mit.edu
Lines: 64

Subject:  G++ question.
--------

Hi,

I don't know that this is the  right place to post this, but it is the
only address I had available. Please forgive me if it is the wrong
place and forward the message or tell me where to send this type of request.

I have been trying to get the NIHCL library  to compile with G++ but
keep running into the following errors.  This error is repeated over
and over for every class that attempts to compile.  I tracked the error
message down to a macro definition wich follows the error listing. 
Every time this macro is called the error message is reapeted.  I
couldn't make out the error and was hoping that maybe someone with
greater knowledge and experience than myself could.   Thankyou immensely in advance.


Brian McGinnis
mcginnis@applga.aa.cad.slb.com


ERROR MESSAGE
-------------------------------
Object.h: In function class Class &static Class::castdown (class Object &):
In file included from Collection.h:75, from ArrayOb.h:72, from ArrayOb.c:85:
Object.h:468: type `Class' is not a base type for type `Object'
ObjectObject.h: In function class Class &static Class::castdown (class Object &):
In file included from Collection.h:75, from ArrayOb.h:72, from ArrayOb.c:85:
Object.h:468: type `Class' is not a base type for type `Object'
Object.h: In function const class Class &static Class::castdown (const class O
bject &):

ERROR CODE
-------------------------------
#ifdef MI

#define DECLARE_CASTDOWN(classname) \
        static classname& castdown(Object& p) \
                { return *(classname*)(&p ? p._safe_castdown(*desc()) : 0); }
\
        static const classname& castdown(const Object& p) \
                { return *(const classname*)(&p ? p._safe_castdown(*desc()) :
0); } \
        static classname* castdown(Object* p) \
                { return (classname*)(p ? p->_safe_castdown(*desc()) : 0); } \
        static const classname* castdown(const Object* p) \
                { return (const classname*)(p ? p->_safe_castdown(*desc()) : 0
); } \

#else

#define DECLARE_CASTDOWN(classname) \
        static classname& castdown(Object& p)                   { return (clas
sname&)p; } \
        static const classname& castdown(const Object& p)       { return (cons
t classname&)p; } \
        static classname* castdown(Object* p)                   { return (clas
sname*)p; } \
        static const classname* castdown(const Object* p)       { return (cons
t classname*)p; } \

#endif
-----------------------