This problem is a C++ problem - not that Objective-C doesn't have
that problem, but it is much rarer (in Objective C you can add
method to a base class without breaking things, which you can't
safely do in C++ since that alters the vtable layout, though adding
ivars can also break things). Objective-C 2.0 also addresses this
problem, but I'm guessing you can't require that.
For completeness, Objective-C 2.0 on the 64 bit runtime avoids the
fragile base class problem, but Objective-C 2.0 on 32 bit is the same
as before.
Jonathon Mah
email@hidden
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