C++智能指针简单案例
智能指针其实就是对->和*运算符重载的应用
#include <iostream>#include <cstring>using namespace std;class Person{public:Person(int age){cout << "有参构造函数调用" << endl;this->m_age = age;}void showAge(){cout << "年龄:" << this->m_age << endl;}~Person(){cout << "析构函数调用" << endl;}private:int m_age;};//智能指针 用来托管new出来的对象的释放class SmartPointer{public:SmartPointer(Person* person){cout << "SmartPointer" << endl;this->person = person;}//重载指针运算符Person* operator->(){return this->person;}//重载*运算符Person& operator*(){return *this->person;}~SmartPointer(){if(this->person != NULL){cout << "~SmartPointer" << endl;delete this->person;this->person = NULL;}}private:Person* person;};void test01(void){// Person* p = new Person(18);// delete p;SmartPointer sp = SmartPointer(new Person(18));sp->showAge(); //sp->->showAge(),编译器简化为sp->showAge()(*sp).showAge();}int main(int argc, char* argv[]){test01();system("pause");return 0;}
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