c++ - std::vector 用于父类和子类

Question

我需要创建一个可以包含我的父类和子类数据的 vector 。

这就是我做的..

Vehicle是父类

Car是子类

关于 Car.cpp ，它有以下内容

struct Point
{
    int x,y
};

class Car : public Vehicle
{
private:
    Point wheelPoint[4];
    double area;

public:
    void setPoint();
};

void Car::setPoint()
{
    int xData,yData;

    cout << "Please enter X:";
    cin >> xData;

    cout << "Please enter Y:";
    cin >> yData;

    wheelPoint[i].x = xData;
    wheelPoint[i].y = yData;
}

然后在我的 main.cpp

在我的 main.cpp 中

vector<VehicleTwoD> list;
VehicleTwoD *vehicle;
Car *car = new Car;
string vehicleName;

cout << "Please input name of vehicle";
cin >> vehicleName;

vehicle = new Car;
car->setPoint();

list.push_back( Vehicle() );
list.back().setName(vehicleName);

这里是问题.. 我如何将汽车的 wheelPoint 也放入此 vector 中。

我要实现的是一个可以包含的 vector

Vehicle Name: Vehicle Name (private variable at Vehicle - Parent Class)
Wheel Point[0]: Point (X,Y) ( private var at Car - Child Class)
Wheel Point[1]: Point (X,Y) ( private var at Car - Child Class)
Wheel Point[2]: Point (X,Y) ( private var at Car - Child Class)
Wheel Point[3]: Point (X,Y) ( private var at Car - Child Class)

Answer 1

对象容器会受到对象切片的影响。您需要一个指针 vector (最好是智能指针):

vector<std::unique_ptr<Vechicle>> vehicleVector;

你可以做什么:

vehicleVector.push_back(new Vehicle);
vehicleVector.push_back(new Car);

拥有一个对象 vector 将切断 Vechicle 之外的所有类型信息 - 因此，Car 将变成 Vehicle , 丢失所有附加信息。