关于c ++：最终类构造函数和析构函数中对vtable的未定义引用

Undefined reference to vtable in final class constructor and destructor

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你好，我正在尝试从一本书《C++》杰西自由和Jim Keogh的编程入门中学习C++。我正在做第12章多重继承的问题。Q4要求我从以汽车为ADT的车辆中导出汽车和公共汽车，然后从car中导出sportscar、wagon和coupe，并在car中实现一个非纯虚函数。它是在codelite上编译的，但在编译时会出错

undefined reference to 'vtable for Coupe' on the constructor and destructor for Coupe

请任何人告诉我我做错了什么，这样我可以了解更多关于如何使用vtables正确处理虚拟函数定义的信息。

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#include <iostream>

using namespace std;

class Vehicle
{
public:
Vehicle(){};
virtual ~Vehicle(){};
virtual int GetItsSpeed() = 0;
int GetItsTyreSize();
virtual int GetItsRegistration() { return ItsRegistration; }
protected:
int ItsSpeed;
int ItsRegistration;
};

class Car : public Vehicle
{
public:
Car(){};
virtual ~Car(){};
virtual int GetItsSpeed() = 0;
int GetItsBootSize() { return ItsBootSize; }
int GetItsRegistration() { return ItsRegistration; }
virtual int GetItsRadioVolume() = 0;
int GetItsTyreSize() { return ItsTyreSize; }
protected:
int ItsBootSize;
int ItsRadioVolume;
int ItsTyreSize;
};

class Bus : public Vehicle
{
Bus(){};
~Bus(){};
public:
int GetItsSpeed() { return ItsSpeed; }
int GetItsPassengerSize() { return ItsPassengerSize; }
private:
int ItsPassengerSize;
};

class SportsCar : public Car
{
public:
SportsCar(){};
~SportsCar(){};
int GetItsSpeed() { return ItsSpeed; }
int GetItsPowerSteeringAccuracy() { return ItsPowerSteeringAccuracy; }
private:
int ItsPowerSteeringAccuracy;
};

class Wagon : public Car
{
public:
Wagon(){};
~Wagon(){};
int GetItsSpeed() { return ItsSpeed; }
int GetItsTrailerSize() { return ItsTrailerSize; }
private:
int ItsTrailerSize;
};

class Coupe : public Car
{
public:
Coupe(){ ItsTyreSize = 10; }
~Coupe(){};
int GetItsSpeed();
int GetItsInteriorStyle() { return ItsInteriorStyle; }
int GetItsRadioVolume() { return ItsRadioVolume; }
private:
int ItsInteriorStyle;
};

void startof()
{
Coupe MariesCoupe;
cout <<"Maries Coupe has a tyre size of"
<< MariesCoupe.GetItsTyreSize() <<" .

";

}

int main()
{
startof();
return 0;
}