Question

我正在尝试，仅仅为了学习，使用派生的Vector3类创建一个Vector类。第一个Vector类，有一个double * v;数组的指针和一些[]运算符，以便于数据访问，Vector3也有x，y，z指针。

课程的重要部分如下：

class Vector{
protected:
    double* v;
    int size_;

public:
    [ ... a lot of stuff ... ]
    double & operator [](int i);
}

class Vector3 : public Vector{
public:
    double* x;      //Access to v[0]
    double* y;      //Access to v[1]
    double* z;      //Access to v[2]

    Vector3();
    Vector3(double,double,double);
};

所以我的目的是制作像这样的代码：

//You can create a Vector3 and access with x, y, z values:
Vector3 v3 = Vector3(10,9,8);

cout << "Testing v3.x -- v3.y -- v3.z" << endl;
cout << v3.x << " -- " << v3.y << " -- " << v3.z << endl;

//And also change its values
v3.x = 5;
v3.y = 1;
v3.z = 6;

//Now, the two following couts should print the same:
cout << "Testing v3.x -- v3.y -- v3.z and v3[0] -- v3[1] -- v3[2]" << endl;
cout << v3.x << " -- " << v3.y << " -- " << v3.z << endl;
cout << v3[0]<< " -- " << v3[1]<< " -- " << v3[2]<< endl;

我的问题是：

是否可以执行此操作而不修改最后一个代码？

我知道我可以轻松地将这项工作改为v3.x for v3.x [0]或类似的东西，但我希望它更直观。

Answer 1

如果operator=类不需要Vector3，则可以更改引用的指针。

class Vector3 : public Vector{
public:
    double& x;      //Access to v[0]
    double& y;      //Access to v[1]
    double& z;      //Access to v[2]

    Vector3();
    Vector3(double,double,double);
};

尝试使用指针更容易使用c ++类

1 个答案: