c ++ overload the assignment operator

c ++ compiler to add a function of at least four categories:

• Constructor
• Destructor
• Copy constructor, copies a value of the attribute;
• Assignment operator copies the value of the attribute;

#include <the iostream>
 the using  namespace STD;
 class the Person {
 public : 
    the Person ( int Age) { 
        m_Age = new new  int (Age); 
    } 
    int * m_Age;
     ~ the Person () {
         IF (! m_Age = NULL) { 
            Delete m_Age; 
            m_Age = NULL; 
        } 
    } 
    // herein require the use of references, if not equivalent to the use of a new object copy function 
    the Person & operator = (the Person & P) {
         // should first determine whether there is in the heap area attributes, if so, to clean and release then deep copy
        if (m_Age != NULL) {
            delete m_Age;
            m_Age = NULL;
        }
        m_Age = new int(*p.m_Age);
        return *this;

    }
};
void test() {
    Person p1(18);
    Person p2(20);
    Person p3(22);
    p3 = p2 = p1;//赋值操作
    cout << "p1的年龄是：" << *p1.m_Age << endl;
    cout << "p2的年龄是：" << *p2.m_Age << endl;
    cout << "p3的年龄是：" << *p3.m_Age << endl;
}


int main() {
    test();
    system("pause");
    return 0;
}

Output: