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最新推荐文章于 2019-02-14 10:00:56 发布

yukuaishi

最新推荐文章于 2019-02-14 10:00:56 发布

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分类专栏： Exception C++摘记文章标签： destructor inheritance class function object interface

本文链接：https://blog.youkuaiyun.com/yukuaishi/article/details/7063475

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本文深入解析了C++中基本协议类及其派生类的使用，阐述了继承与接口在类设计中的作用，同时强调了类成员函数在实现特定功能时的相互依赖关系。

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class BasicProtocol /* : possible base classes */  // MessageCreator or MessageHelper.
{	
public:	
	BasicProtocol();	
	virtual ~BasicProtocol();	
	bool BasicMsgA( /*...*/ );	
	bool BasicMsgB( /*...*/ );	
	bool BasicMsgC( /*...*/ );	
};

class Protocol1 : public BasicProtocol // is-a or works-like-a ?
{	
public:	
	Protocol1();
	~Protocol1();	
	bool DoMsg1( /*...*/ );	
	bool DoMsg2( /*...*/ );	
	bool DoMsg3( /*...*/ );
	bool DoMsg4( /*...*/ );	
};

class Protocol2 : public BasicProtocol
{	
public:	
	Protocol2();	
	~Protocol2();
	
	bool DoMsg1( /*...*/ );	
	bool DoMsg2( /*...*/ );
	bool DoMsg3( /*...*/ );
	bool DoMsg4( /*...*/ );	
	bool DoMsg5( /*...*/ );	
};

// Each DoMsg…() member function calls the BasicProtocol::Basic…() functions as needed to perform the common work,
// but the DoMsg…() function performs the actual transmissions itself. Each class may have additional members,
// but you can assume that all significant members are shown.

// 1.BasicProtocol provides no virtual functions (other than the destructor, which we'll get to in a minute).[5] 
//   This means that it is not intended to be used polymorphically, which is a strong hint against public inheritance.
// 2.BasicProtocol has no protected functions or members. This means that there is no "derivation interface," 
//   which is a strong hint against any inheritance at all, either public or private.
// 3.BasicProtocol encapsulates common work, but as described, it does not seem to actually perform its own transmissions as the derived classes do. 
//   This means that a BasicProtocol object does not WORK-LIKE-A derived protocol object