Bit sets
Factor handbook » The language » Collections » Sets » Set implementations

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The bit-sets vocabulary implements bit-array-backed sets. Bitsets are efficient for implementing relatively dense sets whose members are in a contiguous range of integers starting from 0. One bit is required for each integer in this range in the underlying representation.

Bit sets form a class:

Constructing new bit sets:
<bit-set> ( capacity -- bit-set )