详解C++基础——类继承

#ifndef TABTENN_H_
#define TABTENN_H_

#include <string>

using std::string;

class TableTennisPlayer
{
private:
  string firstname;
  string lastname;
  bool hasTable;

public:
  TableTennisPlayer (const string& fn = "none",
            const string& ln = "none",bool ht = false);
  void Name() const;
  bool HasTable() const {return hasTable;};
  void ResetTable(bool v) {hasTable = v;};
};

//derived class
class RatedPlayer:public TableTennisPlayer //TableTennisPlayer是基类
{
private:
  unsigned int rating;
public:
  RatedPlayer(unsigned int r = 0,const string& fn = "none",const string& ln = "none",
        bool ht = false);//默认构造函数
  RatedPlayer(unsigned int r,const TableTennisPlayer& tp);//通过基类对象创建派生类对象构造函数
  unsigned int Rating() const {return rating;}
  void ResetRating (unsigned int r) {rating = r;}
};

#endif

tabtenn.h

#include <iostream>
#include "tabtenn.h"

TableTennisPlayer::TableTennisPlayer (const string& fn,const string& ln,bool ht):
  firstname(fn),lastname(ln),hasTable(ht)//成员初始化列表
{}

void TableTennisPlayer::Name() const
{
  std::cout << lastname << ", " << firstname;
}

//RatedPlayer methods
//派生类构造函数必须调用基类构造函数
RatedPlayer::RatedPlayer(unsigned int r,const string& fn,const string& ln,bool ht):
  TableTennisPlayer(fn,ln,ht)//派生类构造函数首先创建基类对象，使用初始化列表完成
{
  rating = r;
}

RatedPlayer::RatedPlayer(unsigned int r,const TableTennisPlayer& tp):
  TableTennisPlayer(tp),rating(r)
{}

tabtenn.cpp

#include <iostream>
#include "tabtenn.h"

using std::endl;
using std::cout;

int main()
{
  TableTennisPlayer player1("Tara","Boomdea",false);//创建基类对象
  RatedPlayer rplayer1(1140,"Mallory","Duck",true);//创建派生类对象
  player1.Name();
  if(player1.HasTable())
    cout << ": has a table.\n";
  else
    cout << ": hasn't a table.\n";
  rplayer1.Name();
  if(rplayer1.HasTable())
    cout << ": has a table.\n";
  else
    cout << ": hasn't a table.\n";

  //initialize RatedPlayer using TableTennisPlayer object
  RatedPlayer rplayer2(1212,player1);
  cout << "Name: ";
  rplayer2.Name();
  cout << ";Rating: " << rplayer2.Rating() << endl;
  return 0;
}

usett.cpp