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Tip of the Day
Language: C++
Expertise: Intermediate
Sep 17, 1998

How to Disable Further Derivation of a Class

In some rare cases, it is useful to disallow further derivation of a class. Classes that implement system API or sensitive security management are good examples for that. Declaring the constructor as private prohibits any further derivation of that class.
 
class Firewall { 
	public: 
		bool isAdressValid( const IP_address& ip);
private: 
Firewall() {}//private constructor disables further derivation from this class
};
If you're familiar with Java, it has the same effect as declaring a class as final.
Danny Kalev
 
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