String的深拷贝

#include<iostream>

using namespace std;

class String

{

public:

char* GetChar()

{

return _ptr;

}

void swap(String&s)

{

char* tmp = s._ptr;

s._ptr = _ptr;

_ptr = tmp;

}

String(char*str)

:_ptr(new char[strlen(str) + 1])

{

strcpy(_ptr, str);

}

String(const String&s)

:_ptr(NULL)

    {

String tmp(s._ptr);

swap(tmp);

}

String& operator=(const String&s)

{

if (this != &s)

{

String tmp(s._ptr);

swap(tmp);

}

return *this;

}

~String()

{

if (_ptr)

{

delete[]_ptr;

}

}

private:

char* _ptr;

};

int main()

{

String s1("abcd");

String s2(s1);

String s3("efghs");

s3 = s2;

cout<< "s1:" << s1.GetChar() << endl;

cout<< "s2:" << s2.GetChar() << endl;

cout << "s3:" << s3.GetChar() << endl;

return 0;

}

String的深拷贝

原文：http://10622551.blog.51cto.com/10612551/1689550