智能指针-共享式shared_ptr

#include <iostream>
#include <string>
#include <vector>
#include <memory>

using namespace std;

class Person
{
  public:
    string name;
    shared_ptr<Person> mother;
    shared_ptr<Person> father;
    vector<weak_ptr<Person>> kids;

    Person(const string& n,
      shared_ptr<Person> m=nullptr,
      shared_ptr<Person> f = nullptr)
    :name(n),mother(m),father(f){}

    ~Person(){
      cout<<"delete"<<name<<endl;
    }
};

shared_ptr<Person> initFamily(const string& name)
{
  shared_ptr<Person> mom(new Person(name+"'s mom"));
  shared_ptr<Person> dad(new Person(name+"'s dad"));
  shared_ptr<Person> kid(new Person(name,mom,dad));

  mom->kids.push_back(kid);
  dad->kids.push_back(kid);

  return kid;
}

int main()
{
  shared_ptr<Person> p = initFamily("nico");
  cout<<"nico's family exists"<<endl;
  cout<<"- nico is shared"<<p.use_count<<" times"<<endl;
  cout<<"-name of 1st kid of kico's mom:"<<p->mother->kids[0]->name<<endl;

  p->initFamily("jim");
  cout<<"jim's family exists..."<<endl;
  return 0;
}

posted @ 2019-05-31 15:10  西北逍遥  阅读(293)  评论(0编辑  收藏  举报