#include <stdio.h>
#include <iostream>
#include <memory>

class Child;
class Parent;

class Parent
{
private:
    std::shared_ptr<Child> ChildPtr = nullptr;
    //std::weak_ptr<Child> ChildPtr;
public:
    Parent() { printf("Parent() +++++++++++++ \n"); }
    ~Parent() { printf("~Parent() +++++++++++++ \n"); }
    void SetChild(std::shared_ptr<Child> sp) { ChildPtr = sp; }
};
class Child
{
private:
    std::shared_ptr<Parent> ParentPtr = nullptr;
public:
    Child() { printf("Child() +++++++++++++ \n"); }
    ~Child() { printf("~Child() +++++++++++++ \n"); }
    void SetParent(std::shared_ptr<Parent> sp) { ParentPtr = sp; }
};

void shareTest()
{
    printf("shareTest +++++++++++++ \n");
    {
        std::shared_ptr<Parent> p(new Parent);
        std::shared_ptr<Child> c(new Child);
        printf("构造完成 ... \n");
        p->SetChild(c);
        c->SetParent(p);
        printf("p use count:%d\n", p.use_count());
        printf("c use count:%d\n", c.use_count());
    }
    printf("shareTest +++++++++++++ \n");
    system("pause");
}
int main()
{
　　shareTest();
　　return 0;
}