On Wednesday, 12 October 2011, Alberto Simões wrote:

My question is: anybody found a way to make locale working on darwin?
Couldn't libboost try to implement an indirection level for mac os X
using the C locale API? (not sure if you are interested, just an
idea).

I'm not sure if this will meet your needs but the upcoming release of boost will include a locale library. You can see the documentation at:

http://svn.boost.org/svn/boost/branches/release/libs/locale/doc/html/index.html