Unfortunately, the loader won't recognize Inherited. As you mention, we put the export macro there, along with Q_OBJECT, per the instructions in the examples. Just for grins, we tried putting it in the Implementation class, too; when we did that, the loader would recognize Implementation, but not, of course, Inherited.

This doesn't break my heart; as I said originally, I don't care much for adapter classes, and not being able to do this isn't that big a deal.

You may be right about the offset issue, anyway. We've done something similar in "raw" C++, but only on Solaris. We may have gotten lucky and exploited a peculiarity of the Solaris linker that wouldn't travel well.