'double& Point：：operator[](unsigned int)'在此上下文中无法访问

‘double& Point::operator[](unsigned int)’ is inaccessible within this context

本文关键字：上下文 访问 Point double operator unsigned int      更新时间：2023-10-16

>我设置了两个类，如下所示：

class Point {
protected:
    double coords[3];
public:
    Point(double x, double y, double z) {
        setX(x);
        setY(y);
        setZ(z);
    };
    ~Point() {};
    double x() {return coords[0];};
    double y() {return coords[1];};
    double z() {return coords[2];};
    void setX(double x) {
        coords[0] = x;
    };
    void setY(double y) {
        coords[1] = y;
    };
    void setZ(double z) {
        coords[2] = z;
    };
    double &operator[](unsigned int x) {
        return coords[x];
    }
};

class Vector:Point {
public:
    Vector(double x, double y, double z);
    ~Vector() {};
    double norm();
    void normalize();
};

现在每当我尝试做这样的事情时：

Vector v;
printf("%dn", v[0]);

我得到：

error: ‘Point’ is not an accessible base of ‘Vector’
error: ‘double& Point::operator[](unsigned int)’ is inaccessible
error: within this context

为什么？

默认情况下，类继承是私有的。您必须显式告诉编译器您希望公共继承：

class Vector : public Point { // public
public:
    Vector(double x, double y, double z);
    ~Vector() {};
    double norm();
    void normalize();
};

类的默认继承说明符是私有的。

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