class People
{
public:
People(int age)
{
this->age = age;
}
public:
int age;
};
int main()
{
int tempAge = 3;
People ZhangSan(tempAge);
People LiSi(ZhangSan);
return 0;
}当执行People LiSi(ZhangSan)时就调用了编译器生成的默认复制构造函数，当执行完这句之后LiSi的age变量就和ZhangSan的age的值得一模一样。#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
class Name
{
public:
Name(char* name,int length)
{
//不能不加this
this->name = new char[length];
this->length =length;
strcpy(this->name,name);
}
void printName()
{
cout<<"The Address of the Name "<<(void*)this->name<<endl;
cout<<this->name<<endl;
}
~Name()
{
delete[] this->name;
}
void setName(char* name,int length)
{
if(this->length <length)
{
delete[] name;
name = new char[length];
}
strcpy(this->name,name);
}
private:
char* name;
int length;
};
int main()
{
char* temp="ZhangSan";
Name ZhangSan(temp,strlen(temp));
Name LiSi(ZhangSan);
ZhangSan.printName();
LiSi.printName();
temp = "Changed";
ZhangSan.setName(temp,strlen(temp));
ZhangSan.printName();
LiSi.printName();
return 0;
}The Address of the Name 0x611600 ZhangSan The Address of the Name 0x611600 ZhangSan The Address of the Name 0x611600 Changed The Address of the Name 0x611600 Changed
Name(Name& temp)
{
this->name =temp.name;
this->length = temp.length;
}
Name(Name& temp)
{
this->name = new char[temp.length];
this->length = temp.length;
if(temp.length!=0)
strcpy(this->name,temp.name);
}再次运行上次的程序：The Address of the Name 0x4c1600 ZhangSan The Address of the Name 0x4c1630 ZhangSan The Address of the Name 0x4c1600 Changed The Address of the Name 0x4c1630 ZhangSan从结果可以看出ZhangSan的name和LiSI的name指向不同的地址，在执行了setName()之后LiSi的name并没有受到影响。内存分布如下：
原文：http://blog.csdn.net/csu_stackoverflow/article/details/24286637