Re: public inheritance of interfaces and virtual (multiple) inheritanc

"Ben Voigt [C++ MVP]" <rbv@nospam.nospam>
Fri, 13 Jul 2007 17:13:45 -0500

So I used /vmg and /vmv flags. These flags removed this warning.
Pointers to member functions became 16 byte.

However, the program crashes ! in different cases in different places.

For example,
ON_BN_CLICKED( ..., OnSomething ) internally uses unions and
complex hacks. So this created even more doubts in me.

Then I just compiled everything without /vmg and /vmv flags and it
works !

but still, I am not sure that this is ok. This copying of bigger pointers
into smallers ones (ok, smaller planned space in a union) worries me a

Can you comment on this? is this ok, or should I take more pains and
find solutions without virtual inheritance?

I suspect that you are sharing these pointers with the MFC library, which is
compiled with different settings. If you and the library don't agree on the
representation of pointer-to-members, the ODR is violated and you get
"undefined behavior", i.e. random crashing or worse.

In GCC, all worked without any warnings, and no additional compiler flags
were used. It seems they are using 8 byte representation for pointers to
member functions and use thunks to make memory address adjustments.

Thanks in advance,
Alibek Jorajev

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