>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
>Also, it'd be nice if you jot down some of these plans for type traits
>on the C++0x Wiki <http://wiki.apache.org/stdcxx/Cpp0x>; e.g., header
>names, internal utilities, TODO work, etc. ;)
Yes, I know. Given that discussion on the topic has died down I could
actually document what we've arrived at.
>
>Thanks,
>Brad.
>
