C++ ShortID
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Create Youtube-Like IDs With PHP/Python/Javascript/Java/SQL and NOW also with C++
For more infos visit:
http://kvz.io/blog/2009/06/10/create-short-ids-with-php-like-youtube-or-tinyurl/

Thanks to Kevin van Zonneveld who published the original PHP Version of the algorithm.

string ShortID::Encode(9007199254740989); //returns FpGNnX2Ef
long ShortID::Decode("FpGNnX2Ef"); //returns 9007199254740989