+ /*! \brief
+ * Sets the help text to print as description.
+ *
+ * \param[in] help Help text to show.
+ * \throws std::bad_alloc if out of memory.
+ *
+ * If `help` is empty, or this method is not called, only a list of
+ * options is printed.
+ * Formatting for the help text is described on \ref page_onlinehelp.
+ */
+ CommandLineHelpWriter &setHelpText(const std::string &help);
+ //! \copydoc setHelpText(const std::string &)
+ CommandLineHelpWriter &
+ setHelpText(const ConstArrayRef<const char *> &help);