Re: [boost] type_traits proposal

From: Lee Brown (lee_at_[hidden])
Date: 2002-01-13 19:13:48

On Sunday 13 January 2002 13:59, you wrote:
> ----- Original Message -----
> From: "Lee Brown" <lee_at_[hidden]>
>
> > > template <class T>
> > > struct is_polymorphic
> > > {
> > >    struct d1 : public T
> > >    {
> > >       d1();
> > >       char padding[256];
> > >    };
> > >    struct d2 : public T
> > >    {
> > >       d2();
> > >       virtual ~d2();
> > >       virtual void foo();
> > >       char padding[256];
> > >    };
> > >    BOOST_STATIC_CONSTANT(bool, value = (sizeof(d2) == sizeof(d1)));
> > > };
> >
> > This reminds me of the guy who got wings and flew too close to the sun.
> > I understand that a programmer sometimes has got to do what he's got to
> > do, but ....  C++ was designed to avoid this sort of hack.
>
> I have to disagree. If it were designed to avoid it, we would have a

I meant rely on compiler implementation.

> portable, standard way to do things like this - one that doesn't
> instantiate 3 more classes than neccessary. Maybe in the next standard...

OK.Speaking of standards, I wonder what the Man (Stroustrup) would think.
Maybe this sort of capability was left out on purpose. You'd know better than
me. 

> -Dave
>
>
>
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