id summary reporter owner description type status milestone component version severity resolution keywords cc 10457 'boost::locale::date_time_duration' : assignment operator could not be generated r.korthaus@… Artyom Beilis "boost/locale/date_time.hpp: warning C4512: 'boost::locale::date_time_duration' : assignment operator could not be generated This is generated with MSVC12 warning level 4. Compiling with treat warnings as error is problematic. The fix is simple, just add a deleted assignment operator: {{{ /// Get ending point /// date_time const &end() const { return e_; } #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1800)) // prevent warning C4512: assignment operator could not be generated BOOST_DELETED_FUNCTION(date_time_duration& operator=(date_time_duration const&)) #endif private: date_time const &s_; date_time const &e_; }}}" Bugs new To Be Determined locale Boost 1.56.0 Problem