adapted/array/at_impl.hpp

0001 /*=============================================================================
0002     Copyright (c) 2010 Christopher Schmidt
0003
0004     Distributed under the Boost Software License, Version 1.0. (See accompanying
0005     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 ==============================================================================*/
0007
0008 #ifndef BOOST_FUSION_ADAPTED_ARRAY_AT_IMPL_HPP
0009 #define BOOST_FUSION_ADAPTED_ARRAY_AT_IMPL_HPP
0010
0011 #include <boost/fusion/support/config.hpp>
0012 #include <boost/type_traits/add_reference.hpp>
0013 #include <boost/type_traits/remove_extent.hpp>
0014
0015 namespace boost { namespace fusion { namespace extension
0016 {
0017     template<typename>
0018     struct at_impl;
0019
0020     template<>
0021     struct at_impl<po_array_tag>
0022     {
0023         template<typename Seq, typename N>
0024         struct apply
0025         {
0026             typedef typename
0027                 add_reference<typename remove_extent<Seq>::type>::type
0028             type;
0029
0030             BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0031             static type
0032             call(Seq& seq)
0033             {
0034                 return seq[N::value];
0035             }
0036         };
0037     };
0038 }}}
0039
0040 #endif