If the @arg type is G_OPTION_ARG_CALLBACK, then @arg_data
must point to a #GOptionArgFunc callback function, which will be
called to handle the extra argument. Otherwise, @arg_data is a
pointer to a location to store the value, the required type of
the location depends on the @arg type:
- G_OPTION_ARG_NONE: gboolean
- G_OPTION_ARG_STRING: gchar*
- G_OPTION_ARG_INT: gint
- G_OPTION_ARG_FILENAME: gchar*
- G_OPTION_ARG_STRING_ARRAY: gchar**
- G_OPTION_ARG_FILENAME_ARRAY: gchar**
- G_OPTION_ARG_DOUBLE: gdouble
If @arg type is G_OPTION_ARG_STRING or G_OPTION_ARG_FILENAME,
the location will contain a newly allocated string if the option
was given. That string needs to be freed by the callee using glib.global.gfree.
Likewise if @arg type is G_OPTION_ARG_STRING_ARRAY or
G_OPTION_ARG_FILENAME_ARRAY, the data should be freed using glib.global.strfreev.
If the @arg type is G_OPTION_ARG_CALLBACK, then @arg_data must point to a #GOptionArgFunc callback function, which will be called to handle the extra argument. Otherwise, @arg_data is a pointer to a location to store the value, the required type of the location depends on the @arg type: - G_OPTION_ARG_NONE: gboolean - G_OPTION_ARG_STRING: gchar* - G_OPTION_ARG_INT: gint - G_OPTION_ARG_FILENAME: gchar* - G_OPTION_ARG_STRING_ARRAY: gchar** - G_OPTION_ARG_FILENAME_ARRAY: gchar** - G_OPTION_ARG_DOUBLE: gdouble If @arg type is G_OPTION_ARG_STRING or G_OPTION_ARG_FILENAME, the location will contain a newly allocated string if the option was given. That string needs to be freed by the callee using glib.global.gfree. Likewise if @arg type is G_OPTION_ARG_STRING_ARRAY or G_OPTION_ARG_FILENAME_ARRAY, the data should be freed using glib.global.strfreev.