关于拷贝构造函数和重载赋值函数

#include "stdafx.h"
#include <iostream>
using namespace std;


class A
{
public:
A();
~A();
A(const A&a)
{
name = new char[100];
strcpy_s(name, sizeof(a.name), a.name);
}


A &operator =(const A & a)
{
if (this == &a) //防止a1 = a1这样的情况
{
return *this;
}
if (name != nullptr) //防止之前创建对象时分配了内存
{
delete[] name;
}
name = new char[100];
strcpy_s(name, sizeof(a.name), "jjj");
return *this;
}


void getName()
{
cout << name << endl;
printf("%p\n", name);
}
private:
char *name;
};


A::A()
{
name = new char[100];
char *ch = "sss";;
strcpy_s(name, sizeof(ch), ch);
}


A::~A()
{
if (name)
delete [] name;
cout << "~A" << endl;
}


int main()
{
A a1; //调用构造函数
a1.getName();
A a2 = a1;//因为这时在创建对象，所以调用的是拷贝构造函数
a2.getName();
a2 = a1;//调用的是重载=函数
a2.getName();
system("pause");
return 0;
}