[ Version ( since = "3.44" ) ]
public async bool contains_email (string email_address, Cancellable? cancellable) throws Error
Asynchronously checks whether contains an email_address.
When the email_address contains multiple addresses, then returns true when at least one address exists in the
address book.
When the operation is finished, callback will be called. You can then call contains_email.end to
get the result of the operation.
| this |
an BookClient |
| email_address |
an email address |
| cancellable |
a Cancellable; can be |
| callback |
callback to call when a result is ready |
| user_data |
user data for the |