* http://aggregate.org/MAGIC/ * http://graphics.stanford.edu/~seander/bithacks.html * https://stackoverflow.com/questions/109023/how-to-count-the-number-of-set-bits-in-a-32-bit-integer/109025#109025 * https://github.com/bloomberg/bde/blob/main/groups/bdl/bdlb/bdlb_bitutil.h
