Re: [boost] [intrusive] rtti_base class proposition

22 Oct 2009

      Eugene Wee wrote:
...
Hi,
On Thu, Oct 22, 2009 at 5:26 AM, Ireneusz Szpilewski
<irek@szpilewski.opole.pl> wrote:
...
...
...
And how exactly are you supposed to make that change at runtime?
What do you suggest?
heart as a member of Me?
Before:
class Me
{
       MyHeart heart;
};
After:
class Me
{
  SomebodyElsesHeart heart;
}
It can't be done at runtime either.
If MyHeart and SomebodyElsesHeart publicly inherited from say, a Heart
(abstract) base class, and if Me's heart member variable was a (smart)
pointer to Heart, then you could indeed change the actual (sub)type of
the Heart object that a Me object owns at runtime. This is a common
technique, methinks.
Regards,
Eugene
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So, what do you suggest?
Heart* as a member of Me?
Let's try:

struct Me
{
     Me()
    {
      heart = new(MyHeart);
   }

   ~Me()
   {
      delete heart;
   }

private:
Heart* heart;
};

What if MyHeart has SingMySong() method while Heart does not?
How can I access it?

Ireneusz Szpilewski