Pointers-to-members

[Coleen Phillimore]

For pointers to virtual functions, the ABI used to say multiply
by two and add one.  I thought the purpose of this was to be able
to distinguish between non-virtual and virtual functions.

It appears that the multiplication by two was removed.  Why?
If a virtual function occupies slot 3 in the vtable, you can't OR
with '1' to determine whether the function is virtual anymore.
Also, if you have a virtual function in slot 7 in the vtable, then add
one, it'll look like a quadword aligned address from the lower bytes.

Was there a new way to distinguish between non-virtual and virtual
functions in pointer to member functions, that I missed?

thanks,
Coleen
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Coleen Phillimore                  | mailto:coleen at zko.dec.com
Compaq Computer Corp.   Nashua, NH | COMPAQ C++ Compiler Development
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