Kagamin wrote:
Steven Schveighoffer Wrote:
Walter, can you confirm that extern(C++) interfaces are equivalent to
inheriting IUnknown? If not, what are the differences?
The difference is COM ABI is standardized, C++ ABI is implementation-defined.
If you are lucky, you can guess, which ABI is meant by extern(C++).
Well, yes, but C++ itself doesn't have interfaces. A COM interface is
basically a MSVC virtual function table. Windows C++ compilers which
support it, follow the Microsoft calling conventions, even if they use a
different ABI for other classes.
The only problem would be if C++ subsequently defined interfaces (in
C++1x) and they were different. I think that's extremely unlikely, since
MSVC defines __interface to be a COM interface.
Note that extern(C++) is much more recent than the COM interface hack.
