/*============================================================================= | |
Copyright (c) 2007 Tobias Schwinger | |
Distributed under the Boost Software License, Version 1.0. (See accompanying | |
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
==============================================================================*/ | |
#if !defined(BOOST_FUSION_ITERATOR_RANGE_AT_IMPL_HPP_INCLUDED) | |
#define BOOST_FUSION_ITERATOR_RANGE_AT_IMPL_HPP_INCLUDED | |
#include <boost/fusion/iterator/advance.hpp> | |
#include <boost/fusion/iterator/deref.hpp> | |
namespace boost { namespace fusion | |
{ | |
struct iterator_range_tag; | |
namespace extension | |
{ | |
template <typename Tag> | |
struct at_impl; | |
template <> | |
struct at_impl<iterator_range_tag> | |
{ | |
template <typename Seq, typename N> | |
struct apply | |
{ | |
typedef typename Seq::begin_type begin_type; | |
typedef typename result_of::advance<begin_type,N>::type pos; | |
typedef typename result_of::deref<pos>::type type; | |
static type | |
call(Seq& s) | |
{ | |
return * advance<N>(s.first); | |
} | |
}; | |
}; | |
} | |
}} | |
#endif | |