Robert Ramey: ...
I don't know anything about the new exceptions library. How good is is or isn't, what it does, etc are not relevant. If you want to create a new throw exception with great new features that's just fine. But don't go foisting on me a whole new layer of work that I don't have time for - give it a different name.
The idea was to enhance the exceptions emitted by your library, thereby making it more useful, without your having to do any work. Users who catch an exception thrown by the serialization library could now take advantage of boost::exception facilities. Users who don't know or care about the additional functionality were supposed to find everything working exactly as before. This approach specifically wasn't meant to require you to use boost::exception (but you can start doing so in the future if you find it worthwhile.)