...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::invalid_command_line_syntax
// In header: <boost/program_options/errors.hpp> class invalid_command_line_syntax : public boost::program_options::invalid_syntax { public: enum kind_t { long_not_allowed = 30, long_adjacent_not_allowed, short_adjacent_not_allowed, empty_adjacent_parameter, missing_parameter, extra_parameter }; // construct/copy/destruct invalid_command_line_syntax(const std::string &, kind_t); // public member functions kind_t kind() const; // protected static functions static std::string error_message(kind_t) ; };