Custom library extending custom libraries

[eluser]patbert[/eluser]
[quote author="christian.schorn" date="1209865702"]I use CIs "load_class" function for this, better than maintaining include directives by hand.

The base library would be in application/libraries/base_lib.php, and application/libraries/extended_lib.php would look like this:

Code:

<?php
load_class('base_lib', false);

class Extended_lib extends Base_lib {
//... library code
}

[/quote]

Woah, that I can do. Where is load_class documented?