Ethan Rublee a47b6c23f5 revert the hamming distance to use unsigned long, on 64bit machines, using size_t
with __build_popcountl doesn't return correct number of bits. the ll version should work, but for simplicity,
locking it down to long for now.  TODO add a unit test for the Hamming distance.
2011-01-24 16:59:14 +00:00
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