Is there any ordered list or balanced tree



I can not find any data structure in Cocoa that maintains sorting order of items gradually added in, using the pairwise comparison results, something like the canonical set in C++'s STL that is usually implemented as a balanced tree.

Thanks in advance.

Welcome to drink some Cocoa, play with my Python pet, and sing Lisp songs, together with a nut, @ http://an00na.blogspot.com/.

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