count-index.go
func NewExpiringCountIndex(resolution Meters, expiration Minutes) *CountIndex {
	newExpiringCounter := func() interface{} {
		return newExpiringCounter(expiration)
	}

	return &CountIndex{newGeoIndex(resolution, newExpiringCounter), make(map[string]Point)}
}
func NewExpiringCountIndex(resolution Meters, expiration Minutes) *CountIndex {
	newExpiringCounter := func() interface{} {
		return newExpiringCounter(expiration)
	}

	return &CountIndex{newGeoIndex(resolution, newExpiringCounter), make(map[string]Point)}
}
func NewExpiringCountIndex ( resolution Meters , expiration Minutes ) * CountIndex { newExpiringCounter := func ( ) interface { } { return newExpiringCounter ( expiration ) } return & CountIndex { newGeoIndex ( resolution , newExpiringCounter ) , make ( map [ string ] Point ) } }
// NewExpiringCountIndex creates an index, which maintains an expiring counter for each cell.
NewExpiringCountIndex creates an index which maintains an expiring counter for each cell .