How to prevent your class getting inherited

Discussion in 'C++' started by jayaraj_ev, Feb 6, 2009.

  1. jayaraj_ev

    jayaraj_ev New Member

    Joined:
    Aug 29, 2007
    Messages:
    20
    Likes Received:
    2
    Trophy Points:
    0
    Occupation:
    Software engineer
    Location:
    Bangalore
    When you plan to design a Class for which you feel that it should not be inherited further by any other class then...Here is a tip : Use of Virtual Private Inheritance

    Code:
    #include <iostream>
    
    using namespace std;
    
    class Base
    {
      protected:
        Base()
        {
          cout<<"Base::Base"<<endl;
        }
    };
    
    class Dervied : virtual private Base
    {
      public:
         Dervied()
         {
           cout<<"Dervied::Dervied"<<endl;
         }
    };
    
    class Client : public Dervied
    {
      public:
         Client()
         {
           cout<<"Client::Client"<<endl;
         }
    };
    
    int main(void)
    {
      Client c;
      return 0;
    }
    
    Here Derived class cannot be inherited by any other class.But when our client class tries to inherit we get a Error :
    In constructor `Client::Client()':
    error: `Base::Base()' is protected


    The reason is simple when ever you inherit a class virtually then you should call the constructor of Base explicity on good design.
     
  2. asadullah.ansari

    asadullah.ansari TechCake

    Joined:
    Jan 9, 2008
    Messages:
    356
    Likes Received:
    14
    Trophy Points:
    0
    Occupation:
    Developer
    Location:
    NOIDA
  3. shabbir

    shabbir Administrator Staff Member

    Joined:
    Jul 12, 2004
    Messages:
    15,369
    Likes Received:
    386
    Trophy Points:
    83
  4. shabbir

    shabbir Administrator Staff Member

    Joined:
    Jul 12, 2004
    Messages:
    15,369
    Likes Received:
    386
    Trophy Points:
    83

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice