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

CPLIB_COLLECTIONS_BITSET = 1

proc `$`(bitset: BitSet): string {....raises: [], tags: [].}

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

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

proc `<<`(bitset: BitSet; x: int): BitSet {....raises: [ValueError], tags: [].}

proc `>>`(bitset: BitSet; x: int): BitSet {....raises: [ValueError], tags: [].}

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

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

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

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

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

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

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

proc `~`(x: BitSet): BitSet {....raises: [ValueError], tags: [].}

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

proc initBitSet(N: int): BitSet {....raises: [ValueError], tags: [].}

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

proc initBitSet(v: openArray[bool]; N: int): BitSet {....raises: [ValueError],
    tags: [].}

proc initBitSetFromIndexes(indexes: openArray[int]; N: int): BitSet {.
    ...raises: [ValueError], tags: [].}

proc len(bitset: BitSet): int {.inline, ...raises: [], tags: [].}

proc lowestBit(bitset: BitSet): int {....raises: [], tags: [].}

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

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

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

iterator items(bitset: BitSet): int {....raises: [], tags: [].}