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Newbie question: why were AVL trees introduced?


I'm porting a prototype I wrote using OpenLDAP 2.0.27 to a newer version (2.1.19) and I've found that in the back-end modules an AVL tree has been introduced in the ldapinfo struct to store Connection instances where there was just a single pointer before. Can anybody please tell me why was this done, or perhaps point me to some document where it is explained?.

Thanks in advance,