> -----Original Message-----
> From: Travis Vitek [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, June 10, 2008 10:34 AM
> To: [email protected]
> Subject: RE: An internal add_const_reference type trait
>
>
>
> >Eric Lemings wrote:
> >
> >Travis,
> >
> >According to our plans for type traits, is this how you
> would define an
> >internal class template that combines the add_const<T> and
> >add_reference<T> type modifiers?
> >
> > #include <rw/_type_traits.h>
> >
> > _RWSTD_NAMESPACE (__rw) {
> >
> > template <class _TypeT>
> > class __rw_add_const_ref
> > {
> > typedef _TYPENAME __rw_add_const<_TypeT>::type _ConstT;
> >
> > public:
> >
> > typedef _TYPENAME __rw_add_reference<_ConstT>::type type;
> > };
> >
> > } // namespace __rw
> >
>
> It is really close. I'd probably make it a struct and if there was any
> complicated logic it would move into an impl struct to reduce
> clutter in
> the outer class.
>
> If you need the above trait, I should let you know that TR1 had
> add_reference, but C++0x replaces that with add_lvalue_reference and
> add_rvalue_reference. So it you should probably use the new
> names as we
> probably won't have an __rw_add_reference trait.
>
> #include <rw/_typetraits.h>
>
> _RWSTD_NAMESPACE (__rw) {
>
> template <class _TypeT>
> struct __rw_add_const_ref
> {
> typedef _TYPENAME __rw_add_lval_ref<
> _TYPENAME __rw_add_const<_TypeT>::type
> >::type type;
> };
>
> } // namespace __rw
Actually, wouldn't this be even better?
template <class _TypeT>
struct __rw_add_const_ref
: __rw_add_lval_ref<_RWSTD_ADD_CONST(_TypeT)> { };
Brad.
