Re: [Boost-users] [range] Trying to make an "is_range" metafunction

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-06-17 17:09:05

AMDG

John Moeller wrote:
> I figured out how to do it (and it's pretty simple):
>
> template < typename R, typename V = void >
> struct is_range_impl
>   : boost::mpl::false_
> {};
>
> template < typename R >
> struct is_range_impl< R, boost::range_iterator< R > >
>   : boost::mpl::true_
> {};
>
> template < typename R > 
> struct is_range 
>   : is_range_impl< R >
> {};
>
> Feel free to pick this apart; I wouldn't mind if it were made better.
>   

Won't this always be false?

In Christ,
Steven Watanabe