c++(重载等号=操作为深拷贝)

// ConsoleApplication19.cpp : 定义控制台应用程序的入口点。
//
#pragma warning(disable:4996)
#include "stdafx.h"
using namespace std;
#include <iostream>

class A {
public:

//=等号操作默认的是浅拷贝 这里重载=为深拷贝 当类里出现指针变量 用等号是浅拷贝
A& operator=(A& obj)
{
if (this->pc != NULL)
{
this->a = 0;
delete this->pc;
}
this->a = obj.a;
this->pc = new char[obj.a];
return *this;
}
A() {}
A(int a)
{
this->a = a;
this->pc = new char[a];
}

~A()
{
if (this->pc != NULL)
{
delete pc;
}
cout << "A析构函数"<< endl;
}
private:
int a;
char * pc;
};

class B {
public:
B()
{

}

private:
int b1;
int b2;
A a1;
A a2;

};

void displayObj()
{
A a1(1);
A a2;

a2 = a1;

}
void main()
{
displayObj();

system("pause");
}