I wrote a library which implements the "non derivable" semantics, which is natively supported by some programming languages such as Java or C#. I believe it is mature for a submission and I request everybody for a feedback about the library itself. I could test it only witch GCC 4.1 but it seems to be 100% standard compliant. I published the library in the Vault under the folder "Generic Programming" with the name "nonderivable.zip". I know that in the vault there is a similar library (called "noninheritable") but one must consider that: 1) it uses a different idiom (private constructor and friend declaration) 2) it uses non standard features, while my implementation aims to be 100% standard compliant 3) it uses a different syntax 4) at least my request could increase the interest about that library Usage -------/ Suppose you want to define a final class Foo, then you have to write class Foo : BOOST_NON_DERIVABLE { }; Best regards, Manuel Fiorelli