[boost] Re: Re: Re: Re: Re: 98% portable ptr<>

From: Philippe A. Bouchard (philippeb_at_[hidden])
Date: 2002-08-21 15:00:03

"Larry Evans" <jcampbell3_at_[hidden]> wrote:
> Larry Evans wrote:

[...]

> > SmartPtr<Mid<left> > spOM( spB );
> > SmartPtr<Top> spOT( spOM );
> > just before:
> > cout<<":spT->t="<<spT->t<<endl;
> > in print_t<right>. You should see the wrong value for spT->t. It will
> > give the value for the left branch. This is because the value for:
> >
> > ptr_base<Top,...>::s_offset[a_p.get_typeid()]

[...]

> OOPS. It is reset by spOT(spOM), not spOM(spB).

Check mate.

I see no other alternative but to have:
sizeof(ptr_base<T, __true_type>) = sizeof(T *);
sizeof(ptr_base<T, __false_type>) = sizeof(ptr_header *) + sizeof(T *);

thru placement operator new (size_t, rc_type const &).

Philippe A. Bouchard