For the sake of components that are built before the release of new
interfaces, this is done via multiple-inheritance of both the old and
the new interfaces.
So a QI of the old interface would not return NS_ERROR_NO_INTERFACE,
but exactly what the component expects. No matter to the requesting
component whether the interface is implemented by an an object that
also happens to implement the newer version of the same interface or
only the old version of the interface.
Different issue when it comes time to deprecate/retire an interface.
On Wed, 13 Jun 2001 23:29:13 -0400, Michael Ang <[EMAIL PROTECTED]>
wrote:
>
>Are you also hoping that the old interfaces will still be available, or
>do you just want to be able to detect the change (through
>NS_ERROR_NO_INTERFACE)? When you say you can "do something sane" if the
