C++：使用Stroustrup示例移动构造函数/赋值的问题

#include <iostream>

class MyObject {
public:
    MyObject() {
        std::cout << "Default constructor" << std::endl;
        data = new int[100];
    }

    MyObject(const MyObject& other) {
        std::cout << "Copy constructor" << std::endl;
        data = new int[100];
        std::copy(other.data, other.data + 100, data);
    }

    MyObject(MyObject&& other) noexcept {
        std::cout << "Move constructor" << std::endl;
        data = other.data;
        other.data = nullptr;
    }

    MyObject& operator=(const MyObject& other) {
        std::cout << "Copy assignment operator" << std::endl;
        if (this != &other) {
            delete[] data;
            data = new int[100];
            std::copy(other.data, other.data + 100, data);
        }
        return *this;
    }

    MyObject& operator=(MyObject&& other) noexcept {
        std::cout << "Move assignment operator" << std::endl;
        if (this != &other) {
            delete[] data;
            data = other.data;
            other.data = nullptr;
        }
        return *this;
    }

    ~MyObject() {
        std::cout << "Destructor" << std::endl;
        delete[] data;
    }

private:
    int* data;
};

int main() {
    MyObject obj1;  // 调用默认构造函数
    MyObject obj2(obj1);  // 调用拷贝构造函数
    MyObject obj3(std::move(obj1));  // 调用移动构造函数

    obj2 = obj3;  // 调用拷贝赋值函数
    obj3 = std::move(obj2);  // 调用移动赋值函数

    return 0;
}