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List:       kde-devel
Subject:    Re: Generic C++ question (dynamic type)
From:       Mark Deneen <deneen () bucknell ! edu>
Date:       2001-02-23 1:59:40
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I've never done this, but if I remember correctly you can overload the new 
operator..

Either way, it looks ugly.  :-)

-M

On Thursday 22 February 2001 08:37 pm, Kurt Granroth wrote:
> I have a non-KDE specific C++ question that I think I know the answer
> to... but since there are so many C++ gurus here, I thought I'd ask
> just in case.
>
> I want to create a class that chooses it's type at run-time.  The
> basic (non-working) code would look something like this:
>
>  class DynamicClass
>  {
>  public:
>    DynamicClass()
>    {
>      this = new ParentClass();
>    }
>  };
>
> 'this' can't be used as an lvalue so that doesn't work.  But is there
> a way to do that anyway?
>
> FWIW, I know this works but would prefer a non-factory way of doing
> this:
>
>   class DynamicClass
>   {
>   public:
>     static Class* init()
>     {
>       return new ParentClass();
>     }
>   }
>
> Any clues?
 
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