id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
6871,"chrono_io.hpp: operator<<(ostream& os, ...) modifies the state of os",vkh@…,viboes,"The code 
    std::locale loc = os.getloc();
    if (!std::has_facet<Facet>(loc))
        os.imbue(std::locale(loc, new Facet));
causes the state of os to be changed. It requires the CLIENT code to do own locale saving, like in
{
   boost::io::ios_locale_saver loc(std::cout);
   std::cout << boost::chrono::system_clock::now() << std::endl;
}

Compare this to stream io code in boost/date_time (e.g., gregorian_io.hpp), that begins with a (correct)
   boost::io::ios_flags_saver iflags(os);

Please fix chrono to behave similarly.

Discovered with 1.47.0 in chrono/chrono_io.hpp, but also exists on the trunk in chrono/io_v1/chrono_io.hpp.",Bugs,closed,Boost 1.52.0,chrono,Boost 1.47.0,Problem,wontfix,,