/*//    使用shred_ptr的主要原因就是避免关注指针指向的资源//    只能指针将自动释放与不再需要的对象的相关资源//    但是某些情况下，这种却不是我们需要的。//    比如 循环引用.两个对象都引用对方。//    又或者 分享一个对象 但是不占有该对象//    这个时候可以使用weak_ptr 其实相对shared_ptr 该指针不增加计数//*/#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<shared_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 _tmain(int argc, _TCHAR* argv[]){    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 nico‘s mom: "        << p->mother->kids[0]->name << endl;    p = initFamily("jim");    cout << "jim‘s family exists" << endl;    return 0;}

/*//    使用shred_ptr的主要原因就是避免关注指针指向的资源//    只能指针将自动释放与不再需要的对象的相关资源//    但是某些情况下，这种却不是我们需要的。//    比如 循环引用.两个对象都引用对方。//    又或者 分享一个对象 但是不占有该对象//    这个时候可以使用weak_ptr 其实相对shared_ptr 该指针不增加计数//*/#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; //weakpointer!!!    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 _tmain(int argc, _TCHAR* argv[]){    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 nico‘s mom: "        << p->mother->kids[0].lock()->name << endl;    p = initFamily("jim");    cout << "jim‘s family exists" << endl;    return 0;}