Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c++ > #9829

Re: dynamic_cast and generic pointer

Show all headers | View raw

On 9/6/2011 3:38 PM, asit wrote:
> /*
>   * File:   main.cpp
>   * Author: asit
>   *
>   * Created on 6 September, 2011, 7:08 PM
>   */
>
> #include<cstdlib>
> #include<iostream>
>
> using namespace std;
>
> /*
>   *
>   */
>
> class A
> {
> public:
>      virtual void show()
>      {
>          cout<<"A"<<endl;
>      }
> };
> class B : public A
> {
> public:
>      void show()
>      {
>          cout<<"B"<<endl;
>      }
> };
> class C : public A
> {
> public:
>      void show()
>      {
>          cout<<"C"<<endl;
>      }
> };
>
> int main(int argc, char** argv)
> {
>      B ob = new B;
        ^^^^^^^^^^^^^  Cannot happen in C++
>      void *ptr;
>      ptr = dynamic_cast<void*>(&ob);
>      B* pt2 = dynamic_cast<B*>(ptr);
>      return 0;
> }
>
>
>
> In the above code, why does the casting fails ??

Because it's not C++ code...

V
-- 
I do not respond to top-posted replies, please don't ask

Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

dynamic_cast and generic pointer asit <lipun4u@gmail.com> - 2011-09-06 12:38 -0700
  Re: dynamic_cast and generic pointer Victor Bazarov <v.bazarov@comcast.invalid> - 2011-09-06 16:48 -0400
    Re: dynamic_cast and generic pointer asit <lipun4u@gmail.com> - 2011-09-06 14:23 -0700
      Re: dynamic_cast and generic pointer Ian Collins <ian-news@hotmail.com> - 2011-09-07 10:09 +1200
      Re: dynamic_cast and generic pointer "Default User" <defaultuserbr@yahoo.com> - 2011-09-06 18:07 -0500
      Re: dynamic_cast and generic pointer Joe Greer <jgreer@doubletake.com> - 2011-09-08 14:45 +0000
  Re: dynamic_cast and generic pointer Asger-P <junk@asger-p.dk> - 2011-09-07 01:08 +0200
  Re: dynamic_cast and generic pointer Paavo Helde <myfirstname@osa.pri.ee> - 2011-09-07 00:02 -0500
  Re: dynamic_cast and generic pointer Juha Nieminen <nospam@thanks.invalid> - 2011-09-07 06:22 +0000
    Re: dynamic_cast and generic pointer Goran <goran.pusic@gmail.com> - 2011-09-07 04:16 -0700
      Re: dynamic_cast and generic pointer BGB <cr88192@hotmail.com> - 2011-09-08 23:17 -0700

csiph-web