育儿班 [英] Parenting class

问题描述

这只企鹅是鸟吗? :)

[包含广告的小企鹅图片已被删除]


请
有什么想法可以防止使用其fly()函数吗? :)

Is this pinguin a bird ? :)

[a picture of the pinguin, containing also advertising, has been removed]


Please
any idea to prevent the usage of its fly() function ? :)

class bird
{
...
public:
...
  virtual void fly();
};

class pinguin : public bird
{
...
};

推荐答案

class pinguin : bird
{
   new private void fly() { }
}

fly方法将是私有的，即无法从任何实现中访问.

The fly method will be private, i.e. not accessible from any implementation.

Hmm ... :)

Hmm... :)

bird theBird;
pinguin thePinguin;
 
covey theCovey;
theCovey.add(theBird);
theCovey.add(thePinguin);
 
bird* pBird = theCovey.GetFirstBird();
while (pBird) {
  pBird->fly();
  // now is here a pinguin, a bird as well... :)
  pBird = theCovey.GetNextBird();
}

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