Re: [Boost-users] Elegant solution to interview question about boost::fusion::vector

Subject: Re: [Boost-users] Elegant solution to interview question about boost::fusion::vector
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2013-03-29 13:54:17

AMDG

On 03/29/2013 09:43 AM, Stuart wrote:
> 
> // Functor that extracts nth element of row vector.
> template <unsigned N>
> struct tuple_at
> {
>     template <class Vector>
>     typename boost::fusion::result_of::at_c<const Vector,N>::type
>     operator()(Vector const& t) const
>     {
>         return boost::fusion::at_c<N, Vector>(t);
>     }
> };
> 
> <snip>
> 
> However, I think that I should be able to achieve the same without the
> template tuple_at.
> 
> <snip>
> 

boost::phoenix::at_c<N>(boost::phoenix::placeholders::_1)

In Christ,
Steven Watanabe