使用shared_ptr的示例？

#include <iostream>
#include <memory>

class MyClass {
public:
    MyClass() {
        std::cout << "MyClass Constructor" << std::endl;
    }

    ~MyClass() {
        std::cout << "MyClass Destructor" << std::endl;
    }

    void doSomething() {
        std::cout << "Doing something..." << std::endl;
    }
};

int main() {
    std::shared_ptr<MyClass> ptr1(new MyClass()); // 创建一个shared_ptr对象，指向MyClass对象
    std::shared_ptr<MyClass> ptr2 = ptr1; // 复制构造函数，ptr2和ptr1指向同一个对象

    ptr1->doSomething(); // 调用MyClass对象的成员函数

    // 输出引用计数
    std::cout << "ptr1 use count: " << ptr1.use_count() << std::endl;
    std::cout << "ptr2 use count: " << ptr2.use_count() << std::endl;

    // 重置shared_ptr，引用计数减1
    ptr1.reset();

    // 输出引用计数
    std::cout << "ptr1 use count after reset: " << ptr1.use_count() << std::endl;
    std::cout << "ptr2 use count after reset: " << ptr2.use_count() << std::endl;

    return 0;
}