C++ shared_ptr

#include <iostream>
#include <memory>
using namespace std;

class Person
{
public:
   Person()
   {
      cout << "Person()构造" << endl;
   }

   ~Person()
   {
      cout << "~Person()析构" << endl;
   }


   Person(const Person &p)
   {
       cout << "Person()拷贝构造" << endl;
       this->name = p.name;
       this->age = p.age;
   }

   const Person& getPerson()
   {
      return *this;
   }

   string name;
   int age;
};

int main()
{
   std::shared_ptr<Person> p1(new Person);
   cout << p1.use_count() << endl;
   cout << p1.get() << endl;
   std::shared_ptr<Person> p2(p1);
   cout << p2.use_count() << endl;
   cout << p2 << endl;
   p2.get()->name = "furong";
   cout << p1.get()->name << endl;
   Person p3(*p1);
   cout << p3.name << endl;

   return 0;
}

$ ./a.out           
Person()构造
1
0x189ec20
2
0x189ec20
furong
Person()拷贝构造
furong
~Person()析构
~Person()析构