Path: utzoo!utgpu!watmath!att!tut.cis.ohio-state.edu!cs.utexas.edu!milano!cadillac!redcloud!rpj
From: rpj@redcloud.cad.mcc.com (Rich Johns)
Newsgroups: comp.lang.c++
Subject: to cast or not to cast
Message-ID: <1977@cadillac.CAD.MCC.COM>
Date: 28 Jul 89 18:17:35 GMT
Sender: news@cadillac.CAD.MCC.COM
Lines: 35

I just made the change from g++ 1.32 to g++ 1.35.1. I'm discovering
that g++ 1.32 was very permissive. For example, 1.32 compiled stuff
similar to the following, where as 1.35.1 complains:

class Picture : public Graphic {
public:
  int GraphicsContaining(Graphic**&);
// other stuff
};

class Selection : public Picture {
// other stuff
};

class PictSelection : public Selection {
// right stuff
};


inline int PictSelection::SelectionsContaining(Selection**& ss) {
    return Picture::GraphicsContaining(ss);
}

G++ 1.35.1 says:

 bad argument for function `Picture::GraphicsContaining (struct
 Graphic **&)' (type was struct Selection **)



Don't tell me that I have to cast. Selection is a derived from
Graphic. Say it aint so.
Rich Johns, MCC CAD Program | 3500 W. Balcones Center Dr., Austin, TX 78759
ARPA: johns@mcc.com         | Phone: [512] 338-3714
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