Re: [boost] is_incomplete

From: Peter Dimov (pdimov_at_[hidden])
Date: 2002-10-23 09:52:20

From: "Aleksey Gurtovoy" <agurtovoy_at_[hidden]>
> Peter Dimov wrote:
> > is_incomplete can never work. It violates ODR. ;-) 
> 
> You are right, of course. It should be something like this instead:

[...]

> Hmm, actually we can do even better:
> 
>     #define BOOST_IS_INCOMPLETE(T) \
>         is_incomplete< T, boost::mpl::integral_c<long,__LINE__> > \
>     /**/
> 
>     template< typename T >
>     struct something
>         : mpl::if_c<
>               BOOST_IS_INCOMPLETE(T)::value
>             , something_impl1<T>
>             , something_impl2<T>
>             >
>     {
>     };

Now something<> violates ODR. ;-)