Define BitArray.GetSetBits

bitarray/bitarray.go

@@ -116,7 +116,12 @@ func (ba *bitArray) GetBit(k uint64) (bool, error) {
 	return result, nil
 }
 
-//ClearBit will unset a bit at the given index if it is set.
+// GetSetBits gets the position of bits set in the array.
+func (ba *bitArray) GetSetBits(_ uint64, buffer []uint64) []uint64 {
+	return buffer[:0]
+}
+
+// ClearBit will unset a bit at the given index if it is set.
 func (ba *bitArray) ClearBit(k uint64) error {
 	if k >= ba.Capacity() {
 		return OutOfRangeError(k)

bitarray/interface.go

@@ -36,6 +36,10 @@ type BitArray interface {
 	// function returns an error if the position is out
 	// of range.  A sparse bit array never returns an error.
 	GetBit(k uint64) (bool, error)
+	// GetSetBits gets the position of bits set in the array. Will
+	// return as many set bits as can fit in the provided buffer
+	// starting from the specified position in the array.
+	GetSetBits(from uint64, buffer []uint64) []uint64
 	// ClearBit clears the bit at the given position.  This
 	// function returns an error if the position is out
 	// of range.  A sparse bit array never returns an error.

bitarray/sparse_bitarray.go

@@ -127,6 +127,11 @@ func (sba *sparseBitArray) GetBit(k uint64) (bool, error) {
 	return sba.blocks[i].get(position), nil
 }
 
+// GetSetBits gets the position of bits set in the array.
+func (sba *sparseBitArray) GetSetBits(_ uint64, buffer []uint64) []uint64 {
+	return buffer[:0]
+}
+
 // ToNums converts this sparse bitarray to a list of numbers contained
 // within it.
 func (sba *sparseBitArray) ToNums() []uint64 {