Xref: news2.mv.net comp.os.msdos.djgpp:1457
From: Erik Max Francis <max AT alcyone DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: "virtual outside class decl" C++ error
Date: Sun, 25 Feb 1996 14:54:26 -0800
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References: <199602252020 DOT PAA23382 AT twain DOT oit DOT umass DOT edu>
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To: djgpp AT delorie DOT com
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Denis P Dersarkisian wrote:

> When I moved the bodies of these two virtuals into their class's declarations,
> these errors went away..., however, every other method whose code wasn't within
> a class declaration was reported as an error!
> The same program compiles without any problems under v1.12.
> Does anyone have an idea of how I can solve this problem?  I'm stumped.

I'm just hazarding a guess here (since I unfortunately don't have gcc 2.7.x
installed on my DOS or Linux machines right now), but it looks like gcc is
complaining that you declared the member function as a non-virtual member
function inside the class declaration, but indicated it virtual (with the
`virtual' keyword) _outside_ of the class declaration, like this:

    class C
    {
      public:
        f();
    };

    virtual C::f()
    {
        // ...
    }

If this is what you're doing, what you should instead do is

    class C
    {
      public:
        virtual f();
    };

    C::f()
    {
        // ...
    }

In other words, _declare_ the member function as virtual inside the class
declaration, even though the function is defined outside of the class
declaration.

This sounds like it might be your problem; gcc 2.6.3 doesn't complain about it
under Linux (so I presume it doesn't complain about it under DJGPP 1.x), even
though it's something that the compiler should validly complain about.  Also,
your claim that the problem is fixed by declaring the member function inside the
declaration makes sense, because that way you're declaring it as virtual; the
fact that is defined inside the class is just incidental.

Let me know if this isn't the problem; sounds like it might be what's happening,
though.

-- 
Erik Max Francis, &tSftDotIotE. && max AT alcyone DOT darkside DOT com || max AT alcyone DOT com
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