https://svn.boost.org/trac10/ticket/9959 <p> Is there a reason why the += and -= operators of boost::date_time::date return a copy instead of a reference to the current object? Usually I would always expect a reference to be returned for any implementation of these operators. </p> <p> Thank you for your answers. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/9959 Trac 1.4.3