Re: What the hell is dynamic_cast for?

From:
Victor Bazarov <v.Abazarov@comAcast.net>
Newsgroups:
comp.lang.c++
Date:
Wed, 28 May 2008 15:29:46 -0400
Message-ID:
<g1kbra$475$1@news.datemas.de>
Fernando G?mez wrote:

On May 28, 2:15 pm, David C?me <davidc...@wanadoo.fr> wrote:

On Wed, 28 May 2008 21:07:26 +0200, Fernando G?mez

<fernando.a.gome...@gmail.com> wrote:

On May 28, 12:48 pm, Victor Bazarov <v.Abaza...@comAcast.net> wrote:

lovecreatesbea...@gmail.com wrote:

Suppose I have the following three classes,
   GrandBase <-- Base <-- Child <-- GrandChild
The following cast expression holds true only if pBase points object
of type of ``Child'' or ``GrandChild'', i.e. types not upper than
Child in the above class hierarchy,
   dynamic_cast<Child*>pBase
Do I draw this correctly?

You missed the parentheses and your class has to be polymorphic (have at
least one virtual function).

Wouldn't that be: "have a vritual destructor"?

No. He is right.


So, can you have a polymorphic class without a virtual destructor?


You don't need a virtual destructor if you're not planning on
polymorphic destruction.

V
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