[C++知识库]智能指针 c++（指针重载）

智能指针

使用智能指针来托管自定义类型的对象，让对象进行自动的释放。

#include<iostream>
using namespace std;
class Person{
    public:
        Person(int age){
            this->age = age;
        }
        int age;
        void show_age(){
            cout<<"nianling  is "<<this->age;
    }
    ~Person(){
        cout<<"diaoyongxigou"<<endl;
    }
};
class smartPointer{
    public:
        smartPointer(Person *p){
        this ->person = p;
    }
    // chongzai  zhizhen
        Person* operator->(){
            return this->person;
        }
        Person& operator*(){
            return *(this->person);
        }
        ~smartPointer(){
            cout<<"zhi neng zhi zhen xi gou"<<endl;
            if(this->person !=NULL){
                delete this->person;
                this->person = NULL;
            }
        }
    private:
        Person *person;
};
void test_01(){
    //Person p1(10);   zidongxigou    kaipidaozhanshang
    //Person *p1 = new Person(10);//kai pi dao dui shang  xuyao delete caihui diaoyong xigou
   // delete p1;
    smartPointer sp (new Person(10));
    sp->show_age();
    (*sp).show_age();
}
int main(){
    test_01();
    system("pause");
}