Hi, I did not understand some behaviors of Gcc. Gcc accepts this: -->8-- class A {}; class B {}; A B; -->8-- I found nothing in the standard that says it is not valid. Ok. According to the standard this one is valid, and Gcc accepts it: -->8-- typedef int T; typedef int T; -->8-- It does not accept this one: -->8-- typedef int T; T T; -->8-- That is ok, T is a typedef-name. But on this one, it fails: -->8-- class A {}; typedef A T; T T; -->8-- But normally, T is class-name. And the same on this one: -->8-- typedef class {} A; A A; -->8-- But here, A is not only a class-name, it is *THE* real name of the class. I do not understand why Gcc does not accept these two last examples. I did not find it in the standard. If someone find it somewhere... -- Valentin David valentin.david@gmail.com