36_重載指針運算符* ->

#include <iostream>

using namespace std;
class Person
{
private:
    int num;
public:
    Person(int num):num(num)
    {
        //this->num = num;
        cout<<"有參構造num = "<<num<<endl;
    }

    void showPerson(void)
    {
        cout<<"num = "<<num<<endl;
    }
    ~Person()
    {
        cout<<"析構函數 num = "<<num<<endl;
    }
};

//設計一個智能指針 解決 Person new出的堆區空間 釋放問題
class SmartPointer{
public:
    Person *pPerson;
public:
    SmartPointer(Person *p)
    {
        pPerson = p;
    }

    ~SmartPointer()
    {
        if(pPerson != NULL)
        {
            delete pPerson;
            pPerson = NULL;
        }
    }

    //成員函數重載->運算符
    Person* operator->()
    {
        return this->pPerson;
    }

    //成員函數 重載 *運算
    Person& operator*()
    {
        return *(this->pPerson);
    }
};
void test01()
{
    Person *p = new Person(100);
    p->showPerson();

    //假如我忘了 delete p
    //delete p;

    //需求：自動的幫我釋放 堆區空間（智能指針的概念）
    SmartPointer pointer(new Person(200));

    //訪問Person類中的showPerson()
    //pointer.pPerson->showPerson();

    //保證指針的使用
    //(pointer.operator ->())->showPerson();
    pointer->showPerson();
    (*pointer).showPerson();
    
}
int main(int argc, char *argv[])
{
    test01();
    return 0;
}

運行結果：