“三法则”的实施出了问题

问：

下面是“三法则”的错误实现，我试图理解。

调试程序时，我发现调试器在清理时遇到了问题，可以通过在复制构造函数中定义或简单地将其设置为合理的值来解决。int *kint *k = nullptr

但是，我不明白程序产生的错误（访问违规）是如何产生的。

我确实知道，在复制赋值构造函数不再指向有效的内存地址之后。v1int *k

class Vector2 {
public:
    std::string name = "default";
    int* k;

    Vector2(int s, std::string n) : k(new int[s]), name(n) {
    }

    Vector2(const Vector2 &other)  {
        std::cout<< "Copy constructor: " << name << std::endl;
    }

    ~Vector2() {
        std::cout << "Deleting: " << name << std::endl;
        delete[] k;
    }

    void swap(Vector2& other) {
        using std::swap;
        swap(k, other.k);
    }

    Vector2& operator=(Vector2 other) {
        std::cout << "Copy assignment constructor: " << name << std::endl;
        swap(other);
        return *this;
    }
};


int main() {
        Vector2 v1 = Vector2(2, "v1");
        Vector2 v2 = Vector2(4, "v2");
        v1 = v2;
        std::cout << &v1 << " " << &v2 << std::endl;
        std::cout << &v1.k << " " << &v2.k << std::endl;
        return 0;
    }

下面是上述程序的控制台输出：

Copy constructor: default
Copy assignment constructor: v1
Deleting: default
0000001B5611FA28 0000001B5611FA78
0000001B5611FA50 0000001B5611FAA0
Deleting: v2
Deleting: v1
16:18:42: The program has unexpectedly finished.