Method GetBitAtIndex

postgres/parser/utils/bitarray.go:558–571

GetBitAtIndex extract bit at given index in the BitArray.

(index int)

// GetBitAtIndex extract bit at given index in the BitArray.
func (d BitArray) GetBitAtIndex(index int) (int, error) {
	// Check whether index asked is inside BitArray.
	if index < 0 || uint(index) >= d.BitLen() {
		err := fmt.Errorf("GetBitAtIndex: bit index %d out of valid range (0..%d)", index, int(d.BitLen())-1)
		return 0, pgerror.WithCandidateCode(err, pgcode.ArraySubscript)
	}
	// To extract bit at the given index, we have to determine the
	// position within words array, i.e. index/numBitsPerWord after
	// that checked the bit at residual index.
	if d.words[index/numBitsPerWord]&(word(1)<<(numBitsPerWord-1-uint(index)%numBitsPerWord)) != 0 {
		return 1, nil
	}
	return 0, nil
}

// SetBitAtIndex returns the BitArray with an updated bit at a given index.
func (d BitArray) SetBitAtIndex(index, toSet int) (BitArray, error) {