upgrade_contacts_async
Description:
public async bool upgrade_contacts_async (Contact[] contacts, ContactFeature[] features, out GenericArray<unowned Contact> contacts_out) throws Error
Given several Contact objects, make asynchronous method calls ensure
that all the features specified in features are ready for use (if they are supported at all).
It is not an error to put features in features even if the connection manager doesn't support them - users of this method should
have a static list of features they would like to use if possible, and use it for all connection managers.
Parameters:
| this |
A connection, which must have the |
| contacts |
An array of Contact objects associated with this |
| features |
An array of features that must be ready for use (if supported) before the callback is called |
| callback |
A user callback to call when the contacts are ready |
| n_contacts |
The number of contacts in |
| n_features |
The number of features in |
| user_data |
Data to pass to the callback |