类中std::vector的析构函数

如果类中有std::vector，还需要定义析构函数吗?

如果我为基类和派生类定义空虚析构函数，我会得到内存泄漏吗?

class fruit{
    public:
        uint32_t num_seed;
        //virtual ~fruit(void){}
} ;
class spiky_apple: public fruit{
    typedef std::vector<uint32_t> vector;
    public:
        vector spikes;
        void bomb(void);
            //spikes.reserve(2000)
            //and then spikes[i] = xyz.
        //virtual ~spiky_apple(void){}
} ;