[ Version ( since = "3.50" ) ]
public Object ref_view_user_data (size_t view_id)
References user data previously set by take_view_user_data for the
view_id.
Free the returned non-NULL object with unref, when no longer needed.
| this |
an BookBackend |
| view_id |
a view identifier |
|
previously set user data for the |