[Boost-users] true typedef (true_typedef) implemented in boost?

Hi, I stumbled upon the concept of true typedef, or strong typedef in opposition to usual typedef which are weak. http://www.drdobbs.com/184401633, there is a true_typedef implemented in stlsoft http://www.stlsoft.org/doc-1.9/classstlsoft_1_1true__typedef.html I was wondering if this is already implemented in some corner of Boost, or as a detail implementation. If it is really a useful concept (I don't know) then, I though, Boost should have it somewhere. And if it doesn't have it then it must mean that Boosters come out with something even better. Did they? Thank you, Alfredo