Re: [boost] Re: shared_ptr: unsafe, or am I crazy?

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-01-20 09:22:56

From: "David Abrahams" <david.abrahams_at_[hidden]>
> From: "Peter Dimov" <pdimov_at_[hidden]>
>
> > True, there is no way to detect the general case where a shared_ptr is
> being
> > constructed from a T * that actually points to something derived from T.
>
> Actually,
>
>     typeid(*p) == typeid(T)
>
> Gets you about as far along as you could hope for (my current work uses
> /lots/ of RTTI so this jumped out at me ;-)). Not that you'd probably want
> to pay for typeid.

But unfortunately this fails (missed negative) for non-polymorphic T, and
fails (false positive) for polymorphic T with a virtual destructor. ;-)

--
Peter Dimov
Multi Media Ltd.