Go 整形转成int64

func ParseInt(num interface{
   }) (int64, bool) {
   
    switch num.(type) {
   
    case int64:
        return num.(int64), true

    case int32:
        return int64(num.(int32)), true
    case int16:
        return int64(num.(int16)), true
    case int8:
        return int64(num.(int8)), true
    case int:
        return int64(num.(int)), true
    }
    return 0, false
}