Hi, I was wondering if there was a policy for boost including C++11 features into the libraries. Obviously there might be many projects out there that do not (yet) have access to a compiler implementing the new standard or choosing not to use such a compiler. Anyways I was looking for a dimensional analysis library for compile time units checking and found Boost.Units to be quite slow at compile time even for the relatively small example code in the quickstart documentation. So I've written a bit of code that follows the approach of Boost.Units but uses C++11 features (constexpr, variadic templates, suffix operator, auto). It is not a complete library that I would use in a production environment, but it looks promising, since compilation times are about a factor 2-3 faster on my machine. It would be great if some of you could take a look. https://github.com/legento/units Maybe one could add an implementation like that to Boost.Units as a C++11 compiler detected feature to speed things up. Maybe I am totally wrong and it is some coincidence that this compiles faster on my platform. I did just minimalistic 'ok it seems to work' testing and was about as thorough with measurements. So see this as an implementation sketch. Regards Oliver