On 8/23/2012 7:57 PM, Mathias Gaunard wrote:
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?
No, the result should be the target sequence type identified by its tag. Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com