swift4_migration2.swift

class BaseCell: UITableViewCell
{
    func isBlank() -> Bool
    {
        return false
    }
    
    func isValid() -> Bool
    {
        return false
    }
}

class SampleCell: BaseCell
{
    override func isValid() -> Bool
    {
        return true
    }
    
    override func isBlank() -> Bool
    {
        return true
    }
}