+ /*! \brief
+ * Sets a default type/extension for the file option.
+ *
+ * For options that accept multiple types of files (e.g.,
+ * eftTrajectory), this method sets the default extension used
+ * for completing defaultBasename(), as well as the default extension
+ * used by FileNameOptionManager to complete various file names.
+ *
+ * The value should be one of the enumerated `ef*` values from
+ * filenm.h, and be a valid type for the type specified with
+ * filetype().
+ */
+ MyClass &defaultType(int filetype)
+ { defaultType_ = filetype; return me(); }