BitSet {.byref.} = object
  bits: seq[uint]

CPLIB_COLLECTIONS_BITSET = 1

proc `&=`(x: var BitSet; y: BitSet) {....raises: [], tags: [].}

proc `&`(x, y: BitSet): BitSet {....raises: [], tags: [].}

proc `[]=`(bitset: var BitSet; idx: Natural; x: bool) {....raises: [], tags: [].}

proc `[]`(bitset: BitSet; idx: Natural): bool {....raises: [], tags: [].}

proc `^=`(x: var BitSet; y: BitSet) {....raises: [], tags: [].}

proc `|=`(x: var BitSet; y: BitSet) {....raises: [], tags: [].}

proc `|`(x, y: BitSet): BitSet {....raises: [], tags: [].}

proc andpopcount(x, y: BitSet): int {....raises: [], tags: [].}

proc initBitSet(v: seq[bool]): BitSet {....raises: [], tags: [].}

proc popcount(x: BitSet): int {....raises: [], tags: [].}