HyperLogLog++ is advanced cardinality estimation algorithm with normal and compressed sparse representations. It can be used to estimate approximate number of unique elements in an unordered set.

hll-d [1, 2] is written in D. It can be used as betterC library without linking with DRuntime. hll-d has C header and C example.

Its implementation is based on Mir Algorithm [3]
1. mir.ndslice.topology.bitpack is used for arrays composed of packed 6bit integers
  2. mir.ndslice.sorting.sort is used for betterC sorting.

[1] Git: https://github.com/tamediadigital/hll-d
[2] Dub: http://code.dlang.org/packages/hll-d
[3] Mir Algorithm: https://github.com/libmir/mir-algorithm

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