find_with_equal_func_full
Description:
[ Version ( since = "2.74" ) ]
public bool find_with_equal_func_full (Object? item, EqualFuncFull<Object> equal_func, out uint position)
  public bool find_with_equal_func_full (Object? item, EqualFuncFull<Object> equal_func, out uint position)
Like find_with_equal_func but with an additional user_data
       that is passed to equal_func.
item is always passed as second parameter to equal_func.
Since GLib 2.76 it is possible to pass `NULL` for item.
Parameters:
| this | |
| item | an item | 
| equal_func | A custom equality check function | 
| position | the first position of  | 
| user_data | user data for  | 
Returns:
| Whether this contains  |