从儿童课程中获得结构，并在主班上使用

Get Struct from child class and use in main class

本文关键字：程中获 结构      更新时间：2023-10-16

这是我的代码

的问题

我有一个父级Shape和一个子类Square 

struct Point
{
    int x,y;
};
class Shape
{
private:
    string name;
public:
    void setName(string);
    string getName();
    virtual void setVerticlePoint() { };
    virtual Point getVerticlePoint();
};

下面是square.cpp 

class Square: public Shape
{
private:
    Point verticlePoint[4];
public:
    int noOfVerticles() const { return 5; }
    void setVerticlePoint();
    Point getVerticlePoint();
};
void Square::setVerticlePoint()
{
    int xData,yData;
    for(int i=0; i<4; i++)
    {
        cout << "Please enter x-ordinate of pt." << i << " :";
        cin > xData;
        cout << "Please enter y-ordinate of pt." << i << " :";
        cin >> yData;
        verticlePoint[i]->x = xData;
        verticlePoint[i]->y = yData;
    }
}

所以在main.cpp，我做了

int main()
{
    Shape *point[5];
    Point vertic`lePoint;
    Square *cro = new Square();
    // some codes in between
    // now i prompt for verticle point
    shape[0] = squr;
    //assuming myShape & myType is some string value
    shape[0]->setName(myShape);
    shape[0].setType(myType);
    //here i will be prompt to key in 4 times of X & y Ordinate of the verticle point
    shape[0]->setVerticlePoint();
    //Now the issue is i need to retrieve back my verticle point that i store in shape[0].
    //here no issue
    cout << "Get Name: " << shape[0]->getName() << endl;
    cout << "Get Data:"  << shape[0]->getType() << endl;
    //the top 2 works
    //this is the issue
    verticlePoint = shape[0]->getVerticlePoint();
    cout << sizeof(verticlePoint);
    //it output as size 8 , no matter which shape i use, i got other shapes with different verticle point.
    return 0;
}

问题是：

我如何检索verticlePoint[array]（例如，对于正方形是verticlePoint[4]，如何将点检索到主类中的变量中，然后使用for loop来调用verticlePoint[0]的x,y，for CC_7 for verticlePoint[4]

感谢您的帮助！

显然您想根据形状返回其他点。为此，您可以将std::vector<Point>用作返回类型...例如：

class Shape
{
private:
    string name;
public:
    void setName(string);
    string getName();
    virtual void setVerticlePoint() { };
    virtual std::vector<Point> getVerticlePoint();
};

然后在广场上，您将返回一个4分...

的向量 
std::vector<Point> Square::getVerticlePoint()
{
    return std::vector<Point>(verticlePoint, verticlePoint+4);
}
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