C++ 进阶5 拷贝构造 深度复制 运算符重载

C++ 进阶5 拷贝构造 深度复制 运算符重载 20131026

例子： 运行环境是G++ 编译，

/*

* main.cpp

*

*  Created on: 2013年10月26日

*      Author: yangtfei

*/

#include <iostream>

#include <cstring>

#include <stdlib.h>

#include <stdio.h>

using namespace std;

class Base{

private:

int val;

char * str;

public:

Base(const char * str, const int v){

this->val = v;

int len  = strlen(str);

this->str = new char[len+1];

strcpy(this->str,str);

}

Base(const Base & b){

this->val = b.val;

int len  = strlen(b.str);

this->str = new char[len+1];

strcpy(str, b.str);

}

Base& operator=(const Base& b){

this->val = b.val;

int len =  strlen(b.str);

this->str = new char[len+1];

strcpy(str,b.str);

return *this;

}

~Base(){

delete this->str;

cout << "Base::~Base()" << endl;

}

void printInfo(){

cout << "val:" << this->val << ", name:" << this->str << endl;

}

void setName(const char * name){

if(this->str!= NULL){

delete str;

str = NULL;

}

int len  = strlen(name);

str = new char[len+1];

strcpy(str,name);

}

};

void getMemory(char ** p , int num){

*p =(char*) malloc(num);

}

int main(){

Base b("yang",10);

Base c = b;

Base d (b);

b.printInfo();

c.printInfo();

d.printInfo();

b.setName("teng");

c.setName("fei");

b.printInfo();

c.printInfo();

d.printInfo();

return 0;

}