class Person

{
public:
Person():m_name(NULL),m_nameLen(0){};//？？？？？？？？？？
~Person()
{
clear();//清理内存
}
Person& operator=(const Person&p);//操作符重载：赋值操作符
void setName(const char *newName);
private:
void clear()
{
if (m_name)
{
delete[] m_name;
m_nameLen = 0;
m_name = NULL;
}
}
private:
char *m_name;//当类中存在指针类型的数据时，需要赋值构造函数中先释放后赋值
int m_nameLen;
};


void Person::setName( const char *newName )
{
clear();
int newLen = strlen(newName);
m_nameLen = newLen;
m_name = new char[m_nameLen+1];//分配与字符串相同长度的内存+1
m_name[m_nameLen] = 0;//末尾加上字符串结束标志
strcpy(m_name, newName);//字符串复制
}


Person& Person::operator=( const Person&p )
{
setName(p.m_name);
return *this;
}


void testPerson()
{
Person p1, p2;
p1.setName("zhangsan");
p2.setName("lisi");
p1 = p2;
p1.setName("wangwu");


Person p3(p1);
}

class Person

{
public:
Person():m_name(NULL),m_nameLen(0){};//？？？？？？？？？？
~Person()
{
clear();//清理内存
}
Person& operator=(const Person&p);//操作符重载：赋值操作符
void setName(const char *newName);
private:
void clear()
{
if (m_name)
{
delete[] m_name;
m_nameLen = 0;
m_name = NULL;
}
}
private:
char *m_name;//当类中存在指针类型的数据时，需要赋值构造函数中先释放后赋值
int m_nameLen;
};


void Person::setName( const char *newName )
{
clear();
int newLen = strlen(newName);
m_nameLen = newLen;
m_name = new char[m_nameLen+1];//分配与字符串相同长度的内存+1
m_name[m_nameLen] = 0;//末尾加上字符串结束标志
strcpy(m_name, newName);//字符串复制
}


Person& Person::operator=( const Person&p )
{
setName(p.m_name);
return *this;
}


void testPerson()
{
Person p1, p2;
p1.setName("zhangsan");
p2.setName("lisi");
p1 = p2;
p1.setName("wangwu");


Person p3(p1);
}