Re: Polymorphism

From: Rich (Someone_at_somewhere.com)
Date: 12/11/04

  • Next message: fabbl: "Newbie question on visual studio" 
    Date: Sat, 11 Dec 2004 00:59:10 +0000 (UTC)

    Hello,

    I am intrigued by this post and the program :)

    I have not really got as far as polymorphism yet, but a google says
    something about setting the base class destructor as virtual as well and
    then also making derived classes destructors virtual

    something to do with making the whole chain of destructors being called.

    So I am thinking that if the Base class destructor is not made virtual
    then when delete is called it won't call the derived classes destructor
    but it's own one instead?

    Am I also right in saying that a destructor is only needed to be made
    virtual if it has virtual functions in it otherwise there is no point
    making the destructor virtual?

    So the code might look like this?

    class Base
      {
       public:
          virtual void Print() = 0;
          virtual ~Base () {};
      };

    class X : public Base { public: virtual void Print()
                      { std::cout << "X::DoIt\n"; } virtual ~X () {} };

    class Y : public Base { public: virtual void Print()
                      { std::cout << "Y::DoIt\n"; } virtual ~Y () {} };

    class Z : public Base { public: virtual void Print()
                      { std::cout << "Z::DoIt\n"; } virtual ~Z () {} };

    anywhere close?

  • Next message: fabbl: "Newbie question on visual studio"

    Relevant Pages