#include <QCoreApplication>

#include <string>

#include <iostream>

#include <memory>

using namespace  std;

class Test

{

public:

    Test(string s)

    {

        str = s;

       cout<<"Test creat : " << str << endl;

    }

    ~Test()

    {

        cout<<"Test delete:"<<str<<endl;

    }

    string& getStr()

    {

        return str;

    }

    void setStr(string s)

    {

        str = s;

    }

    void print()

    {

        cout<<str<<endl;

    }

private:

    string str;

};

unique_ptr<Test> fun()

{

    return unique_ptr<Test>(new Test(""));

}

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    auto_ptr<Test> ptest0(new Test(""));

    ptest0->setStr("hello ");

    ptest0->print();

    ptest0.get()->print();

    ptest0->getStr() += "world !";

    (*ptest0).print();

    ptest0.reset(new Test(""));

    ptest0->print();

    cout << "\n";

    unique_ptr<Test> ptest1(new Test(""));

    unique_ptr<Test> ptest2(new Test(""));

    ptest1->print();

    ptest2 = std::move(ptest1);//不能直接ptest2 = ptest1

    if(ptest1 == NULL)cout<<"ptest = NULL\n";

    Test* p = ptest2.release();

    p->print();

    ptest1.reset(p);

    ptest1->print();

    ptest2 = fun(); //这里可以用=，因为使用了移动构造函数

    ptest2->print();

    cout << "\n";

    shared_ptr<Test> ptest(new Test(""));

    shared_ptr<Test> ptest23(new Test(""));

    cout<<ptest23->getStr()<<endl;

    cout<<ptest23.use_count()<<endl;

    ptest = ptest23;//"456"引用次数加1，“123”销毁

    ptest->print();

    cout<<ptest23.use_count()<<endl;//

    cout<<ptest.use_count()<<endl;//

    ptest.reset();

    ptest23.reset();//此时“456”销毁

    cout<<"done !\n";

    return a.exec();

}