Re: [Boost-users] problem with shared_ptr

From: Eyal Fink (eyal_at_[hidden])
Date: 2003-12-14 13:15:46

Peter Dimov wrote:

> Eyal Fink wrote:
> > I am using boost share_ptr and I have a very strange problem. it looks
> > to me more like a compiler problem but since it is a boost code I
> > decided to post it here. I haven't succeeded to creating a small 
> example
> > which I can post here and demonstrate the problem (I know it is hard to
> > help that way but I am working on creating an example) so I will just
> describe it.
> > The symptom is that the shared_ptr call the delete on a random pointer.
> > Going into the shared_ptr and shared_count objects, I sow that the ptr
> > field of  sp_counted_base_impl has a wrong value. I have added prints
> > out all over the code and saw that inside the constructor of
> > sp_counted_base_impl the value is set correctly but on the return 
> when I
> > try to look at the value and it is a wrong value. adding some more
> > prints I saw that inside the shared_count constructor:
> > template<class P, class D> shared_count(P p, D d)
> > when casting pi_ to (sp_counted_base_impl<P, D>*) and calling a member
> > function, the sizeof(*this) in side the member function is not the same
> > every time (resulting with a different address to ptr and thus 
> different
> > value).
> > the problem occurs only when compiling -O
>
> Very odd; looks like either optimizer problem or ABI mismatch. Have you
> tried g++ 3.2.3 or 3.3.2?
>
I have not tried newer versions yet (I have tried 2.9.5 and it happens 
there as well)
what is ABI mismatch?

> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>