父类和子类的 std::vector [英] std::vector for parent and child class
问题描述
我需要创建一个可以包含我的父类和子类数据的向量.
I need to create a vector that can contain my parent class and sub class data.
这就是我所做的..
Vehicle 是父类
汽车是子类
关于 Car.cpp ,它有以下内容
About Car.cpp , it got the following
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
Then at my main.cpp
在我的 main.cpp
At my main.cpp
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);
这里的问题..我如何将我的汽车轮点也放入这个向量中.
Here the issues.. how i put my wheelPoint of car into this vector also.
我想要实现的是一个可以包含的向量
What i want to achieve is a vector that can contain
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)
推荐答案
对象的容器受到对象切片的影响.你需要一个指针向量(最好是智能的):
Containers of objects suffer from object slicing. You'll need a vector of pointers (preferably smart):
vector<std::unique_ptr<Vechicle>> vehicleVector;
你可以这样做:
vehicleVector.push_back(new Vehicle);
vehicleVector.push_back(new Car);
拥有对象向量将切断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.
Having a vector of objects will cut off all type information that is beyond Vechicle
- so, a Car
will be turned into a Vehicle
, losing all additional information.
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