Anyway, how does it play with Qt and wxwindows e.g.? I can't find about
this on the docs.
I'm not too familiar with wxWdgets, but in all related to Qt I must admit that Qt does not plays well (if at all) with standard C++ library and STL. It has its own string (QString) its own character (QChar - two bytes) its own locale object (QLocale) and its own tools for localization. Of course nothing prevents from you using Boost.Locale with Qt however it would be bounded and limited by the integration of Qt with STL. For example you would likely want to use things like QString s=QString::fromStdString((format(translate("The time is {1,time}")) % time).str()); However I can say that in case of Gtkmm it would be likely better as it is much more STL friendly in comparison to Qt. Boost.Locale works with standard library concepts so its integration with other frameworks strictly depends on their integration with STL. Artyom