[ Version ( since = "0.19.1" ) ]
public async bool upgrade_contacts_async (Connection connection, Contact[] contacts, out GenericArray<unowned Contact> contacts_out) throws Error
Same as upgrade_contacts_async, but prepare contacts with all features previously passed to add_contact_features.
| this |
a SimpleClientFactory object |
| connection |
a Connection whose factory is this object |
| contacts |
An array of Contact objects associated with this |
| callback |
a callback to call when the operation finishes |
| n_contacts |
The number of contacts in |
| user_data |
data to pass to |