Need help with dynamic_cast across shared libraries with gcc 3.2.3.

[Yuly Novikov]

Unfortunately in the real code I use multiple inheritance + virtual 
inheritance, so reinterpret_cast will return wrong pointer.
Any other ideas?


>From: Eljay Love-Jensen <eljay@adobe.com>
>To: "Yuly Novikov" <novikov_yuly@hotmail.com>, gcc@gcc.gnu.org,   
>gcc-help@gcc.gnu.org
>CC: novikov_yuly@hotmail.com
>Subject: Re: Need help with dynamic_cast across shared libraries with  gcc 
>3.2.3.
>Date: Thu, 17 Jul 2003 09:43:21 -0500
>
>Hi Yuly,
>
> >Is there any other way to make the algorithm above work with gcc 3.2.3?
>
>If you KNOW the pointer is the given type, use a 
>reinterpret_cast<foo*>(ptr) instead of a dynamic_cast<foo*>(ptr).  And put 
>a BIG disclaimer in your source code saying "This is correct.  All your 
>{derived class pointer name} are belong to us."
>
>Also note:  if you use those kinds of objects for exceptions in your 
>across-shared-library boundaries, you'll probably run into situations where 
>your code fails to catch the object.  The dynamic_cast mechanism uses the 
>same RTTI information that the exception handling's catch mechanism uses.   
>And, similiarly, you'll probably experience problems using the RTTI 
>mechanism if you use typeid and type_info.
>
>HTH,
>--Eljay
>
>PS: you shouldn't need to dynamic_cast the derived pointer to the base 
>pointer type.  A derived pointer IS-A base pointer, already.
>
>

_________________________________________________________________
Help STOP SPAM with the new MSN 8 and get 2 months FREE*  
http://join.msn.com/?page=features/junkmail