id summary reporter owner description type status milestone component version severity resolution keywords cc 7777 at() member function required for program_options::variables_map Nana Sakisaka Vladimir Prus "variables_map provides operator[] which sets an empty value to the option, if the specified key does not exist.[[BR]] I think it would be nice and more robust to also provide an overrided member function at() which throws an exception for such circumstances. Related ticket: #7495. If implementing #7495, it will be also required to handle boost::optional values for at()." Feature Requests new To Be Determined program_options Boost 1.52.0 Problem variables_map