//**********************
//**    ch18_7.cpp    **
//**********************

#include <string.h>
#include <iostream.h>

class Name{
public:
  Name(){ pName = 0; }
  Name(char* pn){ copyName(pn); }
  Name(Name & s){ copyName(s.pName); }
  ~Name(){ deleteName(); }
  Name & operator =(Name & s)          //賦值運算符
  {
    deleteName();
    copyName(s.pName);
    return *this;
  }
  void display(){ cout << pName << endl; }
protected:
  void copyName(char* pN);
  void deleteName();
  char* pName;
};

void Name::copyName(char* pN)
{
  pName = new char[strlen(pN) + 1];
  if(pName)
    strcpy(pName, pN);
}

void Name::deleteName()
{
  if(pName){
    delete pName;
    pName = 0;
  }
}

void main()
{
  Name s("claudette");
  Name t("temporary");
  t.display();
  t = s;               //賦值
  t.display();
}