add a TotalOrd trait and reimplement TreeMap with it #5196
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bors
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Mar 2, 2013
This allows `TreeMap`/`TreeSet` to fully express their requirements and reduces the comparisons from ~1.5 per level to 1 which really helps for string keys. I also added `ReverseIter` to the prelude exports because I forgot when I originally added it.
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This allows
TreeMap/TreeSetto fully express their requirements and reduces the comparisons from ~1.5 per level to 1 which really helps for string keys.I also added
ReverseIterto the prelude exports because I forgot when I originally added it.