使用std :: move

class MyClass {
public:
    MyClass() {
        std::cout << "MyClass constructor called." << std::endl;
    }
    MyClass(const MyClass& other) {
        std::cout << "MyClass copy constructor called." << std::endl;
    }
    MyClass& operator=(const MyClass& other) {
        std::cout << "MyClass operator= called." << std::endl;
        return *this;
    }
    MyClass(MyClass&& other) {
        std::cout << "MyClass move constructor called." << std::endl;
    }
    MyClass& operator=(MyClass&& other) {
        std::cout << "MyClass operator= called." << std::endl;
        return *this;
    }
};