Helper function for constructing Initable object.
This is similar to newv but also initializes the object and returns null, setting an error on failure.
| object_type | |
| parameters |
the parameters to use to construct the object |
| cancellable |
optional Cancellable object, null to ignore. |
| n_parameters |
the number of parameters in |
|
a newly allocated Object, or null on error |