Re: [Openexr-devel] Compiling with gcc4.0.1 - compilation error andfix

[Paul Miller]

Florian Kainz wrote:
> The proposed fix for exrmaketiled is harmless one way or the
> other, and changing the code won't create a problem.  However,
> I still maintain that there is a bug in gcc 4.0.1 that should
> be reported.
>
> Section 11.4, clause 2 (page 180) of ISO/IEC 14882 contains
> two code examples.  Here's one of them:
>
>     class X {
>         enum { a = 100; }
>         friend class Y;
>     };
>
>     class Y {
>         int v[X::a];            // OK, Y is a friend of X
>     };
>
>     ...
>
> Note that there is no forward declaration of Y before X.
> Does gcc 4.0.1 give an error message for the example above?

This is a different situation than trying to reference Y in X. A friend 
declaration is different from a usage/containment declaration.

So, to put a pointer to Y in X, you would need to declare "class Y" above X:

class Y;

class X {
    class Y *y_ptr;
    ...

> Florian
>
>
>
>
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