...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_syntax
// In header: <boost/program_options/errors.hpp> class invalid_syntax : public boost::program_options::error_with_option_name { public: enum kind_t { long_not_allowed = 30, long_adjacent_not_allowed, short_adjacent_not_allowed, empty_adjacent_parameter, missing_parameter, extra_parameter, unrecognized_line }; // public member functions invalid_syntax(kind_t, const std::string & = "", const std::string & = "", int = 0); kind_t kind() const; virtual std::string tokens() const; // protected member functions std::string get_template(kind_t); };