...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::program_options::multiple_occurrences
// In header: <boost/program_options/errors.hpp> class multiple_occurrences : public boost::program_options::error_with_option_name { public: // construct/copy/destruct multiple_occurrences(); ~multiple_occurrences(); };