C++ vtable example

[thomson at ca.ibm.com]

Jason writes:
>First, I'd like to propose again that the RTTI info move to negative
>offsets, for COM compatibility.

Yes, have there been objections to this?

On the same topic, it has been proposed to pass two implicit parameters
"this" and "this->__vptr" in virtual function calls instead of the
usual one, in case an adjustment thunk needs the second.  If it is a
C ABI compliant parameter then the same cross-platform COM consistency
considerations argue that we shouldn't do it.
If it is a "magic" parameter that can't be expressed in C then the
situation is worse, and COM may not be implementable.


Jim's examples:

I have extended and I think corrected some errors in the previous
version. Here's hoping that the right things happen to
attachments:

(See attached file: cxx-vtable-ex.html)




Brian Thomson
VisualAge C/C++ Chief Architect

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