Getting a loaded library instance: how?

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I also got this working, but will give the suggestions above a try since they seem a little cleaner.

Code:

$authclass = 'LDAPAuthenticator';
$this->load->library($authclass);
$authenticator = new $authclass();
$authenticator->foo();

dcunited08, the authentication interface is defined by 'Authenticator' and there are subclasses such as LDAPAuthenticator, MySQLAuthenticator, etc.

Thanks all!