[C++] 智能指针

飞奔的炮台

智能指针

#include <iostream>
using namespace std;
class Person
{
public:
  Person(int age)
  {
  cout << "Person有参构造调用" << endl;
  this->m_age = age;
  }
  void showage()
  {
  cout << "age = " << this->m_age << endl;
  }
  ~Person()
  {
  cout << "Person析构函数调用" << endl;
  }
  int m_age;
};

class SmartPoint
{
public:
  SmartPoint(Person* person)
  {
  this->m_person = person;
  }
  ~SmartPoint()
  {
  if (this->m_person)
  {
    delete this->m_person;
    this->m_person = NULL;
  }
  }
  //重载->运算符
  Person* operator->()
  {
  return this->m_person;
  }
  //重载 * 运算符
  Person& operator*()
  {
  return *m_person;
  }
private:
  Person* m_person;
};
void test1()
{
  //Person *p = new Person(18);
  //p->showage();
  ////或者 本体.函数名 (*p).showage();  
  //delete p;
  SmartPoint sp(new Person(18));
  sp->showage(); //编译器简化前 sp->->showage();
  (*sp).showage();
}
int main()
{
  test1();
  return 0;
}