Re: [boost] [fusion] undocumented sequence requirement: convert

Subject: Re: [boost] [fusion] undocumented sequence requirement: convert
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2012-08-23 07:57:28

On 23/08/2012 05:39, Joel de Guzman wrote:

> which result_of::convert calls. Here's an example for vector:
>
>      struct vector_tag;
>
>      namespace extension
>      {
>          template <typename T>
>          struct convert_impl;
>
>          template <>
>          struct convert_impl<vector_tag>
>          {
>              template <typename Sequence>
>              struct apply
>              {
>                  typedef typename
> detail::as_vector<result_of::size<Sequence>::value> gen;
>                  typedef typename gen::
>                      template apply<typename
> result_of::begin<Sequence>::type>::type
>                  type;
>
>                  static type call(Sequence& seq)
>                  {
>                      return gen::call(fusion::begin(seq));
>                  }
>              };
>          };
>      }
>
> Pretty much straightforward. I think it is safe to use this extension
> mechanism. It has been stable for a long time now. Surely, that is
> not an excuse for it being undocumented though. At any rate, I
> added this in my TODO list.

Any reason not to make the vector version the default?