Tuesday, September 3, 2013

not-before-not-after - position-check in sorted data structure

[[more eff c++]] raised many points about the difference between equality check vs equivalence (i call it "ranking-check") check. My short summary is

- not-before-not-after (based on comparison)
vs
- regular equality check as in java

Ranking-check -- checking among existing data items in the container to determine where (if any) to put in an "incoming guest". If the check shows incoming guest would hit the same position as an existing item, then a set/map (without prefix "multi-") would reject.

Note standard STL set and map are all red-black-tree-based and all use ranking-check. There's no hash container in standard STL. C++11 added unordered_*

The other points in the book tend to overwhelm a beginner, who is better off with a firm grip on just one concept -- the real difference between the 2 checks.

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