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package multichoose
type MultiChoose struct {
selected []uint64
length int
limit int
}
func (mc *MultiChoose) getSelected(index int) bool {
if index < 0 || index > mc.length {
return false
}
i := uint64(index) >> 6
j := uint64(index) & 0x3F
return (mc.selected[i] & (1 << j)) != 0
}
func (mc *MultiChoose) setSelected(index int, value bool) {
if index < 0 || index > mc.length {
return
}
i := uint64(index) >> 6
j := uint64(index) & 0x3F
if value {
mc.selected[i] |= (1 << j)
} else {
mc.selected[i] &^= (1 << j)
}
}
func New(length int) *MultiChoose {
return &MultiChoose{
selected: make([]uint64, (length>>6)+1),
length: length,
limit: -1,
}
}
func (mc MultiChoose) Count() int {
count := 0
for i := 0; i <= mc.length; i++ {
if mc.getSelected(i) {
count++
}
}
return count
}
func (mc *MultiChoose) Select(index int) {
if mc.limit >= 0 && mc.Count() >= mc.limit {
return
}
mc.setSelected(index, true)
}
func (mc *MultiChoose) Deselect(index int) {
mc.setSelected(index, false)
}
func (mc MultiChoose) IsSelected(index int) bool {
return mc.getSelected(index)
}
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