#include<iostream>
#include<memory>
using namespace std;
int main() 
{
    unique_ptr<int> up1(new int(11));
    cout << "up = " << *up1 << endl;
    //將up1的獨(dú)占權(quán)轉(zhuǎn)移給up2，up1不能再操作堆區(qū)空間
    unique_ptr<int> up2 = std::move(up1);
    cout << "up2 = " << *up2 << endl;
    //up2.reset();//若為無參作用是顯示釋放堆區(qū)內(nèi)容
    up2.reset(new int(22));//若為有參，先釋放原來堆區(qū)內(nèi)容,重新給up2綁定一個(gè)新的堆區(qū)內(nèi)容
    cout << "up2 = " << *up2 << endl;
    //釋放控制權(quán)，但不釋放堆區(qū)內(nèi)存
    int* p = up2.release();
    cout <<"p = "<< *p << endl;
    delete p;
    p = nullptr;
    return 0;
}

#include<iostream>
#include<memory>
using namespace std;
int main()
{
    //指向數(shù)組的獨(dú)占指針
    unique_ptr<int[] > up(new int[5]);
    for (int k = 0; k < 5; k++)
    {
        up[k] = k+1;
    }
    for (int k = 0; k < 5; k++)
    {
        cout << up[k] << " ";
    }
    cout << endl;
    return 0;
}

#include<iostream>
#include<memory>
using namespace std;
int main()
{
    shared_ptr<int> sp1(new int(11));
    shared_ptr<int>sp2(sp1);//拷貝構(gòu)造
    cout << "num = " << sp2.use_count() << endl;//打印計(jì)數(shù)器 2
    sp1.reset();
    cout << "num = " << sp2.use_count() << endl;//1
    cout << *sp2 << endl;//11
    sp1.reset();
    cout << "num = " << sp1.use_count() << endl;//0
    return 0;
}

#include<iostream>
#include<memory>
using namespace std;
int main()
{
    shared_ptr<int>sp1(new int(11));
    shared_ptr<int>sp2(sp1);
    weak_ptr<int>wp = sp1;
    cout << wp.use_count() << endl;
    shared_ptr<int>sp3 = wp.lock();
    //lock() 若當(dāng)前weak_ptr已經(jīng)過期,則該函數(shù)會(huì)返回一個(gè)空的shared_ptr指針.反之,該函數(shù)返回一個(gè)和當(dāng)前weak_ptr指向相同的shared_ptr。
    cout << wp.use_count() << endl;
    if (sp3 == nullptr)
    {
        cout << "堆區(qū)空間已經(jīng)釋放" << endl;
    }
    else
    {
        //cout << *wp << endl;//err
        cout << *sp3 << endl;//間接訪問
    }
    return 0;
}

#include<iostream>
using namespace std;
class Person
{
public:
    Person(int age)
    {
        cout << "有參構(gòu)造函數(shù)調(diào)用" << endl;
        m_age = age;
    }
    void showage()
    {
        cout << "年齡為:" << this->m_age << endl;
    }
    ~Person()
    {}
    int m_age;
};
//利用智能指針管理new出來的內(nèi)存的釋放
class Smartpoint
{
public:
    Smartpoint(Person* p)
    {
        this->m_person = p;
    }
    //重載->運(yùn)算符
    Person* operator->()
    {
        return this->m_person;
    }
    //重載*運(yùn)算符
    Person& operator*()
    {
        return *m_person;
    }
    ~Smartpoint()
    {
        if (this->m_person != NULL)
        {
            //cout << "析構(gòu)函數(shù)調(diào)用" << endl;
            delete this->m_person;
        }
    }
private:
    Person* m_person;
};
int main()
{
    Smartpoint sp(new Person(18));
    sp->showage();
    (*sp).showage();
    return 0;
}