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boost::program_options::validation_error
// In header: <boost/program_options/errors.hpp> class validation_error : public boost::program_options::error_with_option_name { public: enum kind_t { multiple_values_not_allowed = = 30, at_least_one_value_required, invalid_bool_value, invalid_option_value, invalid_option }; // construct/copy/destruct validation_error(kind_t, const std::string & = "", const std::string & = "", int = 0); ~validation_error(); // protected member functions std::string get_template(kind_t); };