IsNarrowerThan(mask BitMask) bool
	IsLessThan(mask BitMask) bool
	IsGreaterThan(mask BitMask) bool
	String() string
	Count() int
	GetBits() []int
}

type bitMask uint64

// NewEmptyBitMask creates a new, empty BitMask
func NewEmptyBitMask() BitMask {
	s := bitMask(0)
	return &s
}

// NewBitMask creates a new BitMask
func NewBitMask(bits ...int) (BitMask, error) {
	s := bitMask(0)
	err := (&s).Add(bits...)

	tcases := []struct {
		name         string
		expectedMask string
	}{
		{
			name:         "New empty BitMask",
			expectedMask: "00",
		},
	}
	for _, tc := range tcases {
		bm := NewEmptyBitMask()
		if bm.String() != tc.expectedMask {
			t.Errorf("Expected mask to be %v, got %v", tc.expectedMask, bm)
		}
	}
}

func TestNewBitMask(t *testing.T) {
	tcases := []struct {
		name         string

		candidate                     *TopologyHint
		expected                      string
	}{
		{
			"candidate.NUMANodeAffinity.Count() == 0 (1)",
			-1,
			nil,
			&TopologyHint{bitmask.NewEmptyBitMask(), false},
			"current",
		},
		{
			"candidate.NUMANodeAffinity.Count() == 0 (2)",
			-1,
			&TopologyHint{NewTestBitMask(), true},
			&TopologyHint{NewTestBitMask(), false},
			"current",