Re: [boost] Re: [multi_index + mpl + bind] Regression?

From: Vladimir Prus (ghost_at_[hidden])
Date: 2004-09-27 09:02:33

David Abrahams wrote:

> >    namespace boost
> >    {
> >        template<int I> class arg {};
> >    }
> >
> >    namespace mpl_
> >    {
> >        template< int N > struct arg {};
> >    }
> >
> >     namespace boost { namespace mpl {
> >
> >         using namespace mpl_;
> >
> >         template<typename ForwardOp = arg<1> >
> >         struct XXX
> >         {
> >
> > IIRC, the 'arg' visible via using is considered to be declared in the
> > nearest namespace enclosing both mpl_ and boost::mpl -- which is global
> > namespace. So boost::arg hides mpl_::arg. For explicit mpl::aux, the name
> > lookup ignores the 'boost' namespace.
>
> But the fact that explicit qualification doesn't fix it is surely a
> bug?

Not sure. Explicit qualification fixed the above snippet -- the gcc correctly 
used mpl::arg<1>, instead of boost::arg<1>. However, as 
Joaquín noted, there were some other cases where unqualified arg was used and 
they had to be fixed too. 

- Volodya