显示复制构造函数与赋值函数模型

/////////////////赋值/////////////////////////////////
baseDMA & baseDMA::operator=(const baseDMA & rs)
{
    if (this == &rs)
        return *this;
    delete [] label;
    label = new char[strlen(rs.label) + 1];
    strcpy(label, rs.label);
    rating = rs.rating;
    return *this;
}

hasDMA & hasDMA::operator=(const hasDMA & rs)
{
   if (this == &rs)
        return *this;
   baseDMA::operator=(hs); 
   style = new char[strlen(rs.style) + 1];
   strcpy(style, rs.style);
   return *this;
}

 

 

/////赋值构造/////////////////////////////

baseDMA::baseDMA(const baseDMA & rs)
{
    label = new char[strlen(rs.label) + 1];
    strcpy(label, rs.label);
    rating = rs.rating;
}

hasDMA::hasDMA(const hasDMA & hs):baseDMA(hs)
{
  style=new char[strlen(hs.style)+1];
  strcpy(style,hs.style); 
}


////////////////析构//////////////////////////
baseDMA::~baseDMA()
{
   delete [] label;
}

hasDMA::~hasDMA()
{
  delete [] style;
}