1 /*=============================================================================
2 Copyright (c) 2011 Eric Niebler
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 ==============================================================================*/
8 #if !defined(BOOST_FUSION_SINGLE_VIEW_AT_IMPL_JUL_07_2011_1348PM)
9 #define BOOST_FUSION_SINGLE_VIEW_AT_IMPL_JUL_07_2011_1348PM
11 #include <boost/fusion/support/config.hpp>
12 #include <boost/mpl/int.hpp>
13 #include <boost/mpl/assert.hpp>
14 #include <boost/mpl/equal_to.hpp>
16 namespace boost { namespace fusion
18 struct single_view_tag;
22 template<typename Tag>
26 struct at_impl<single_view_tag>
28 template<typename Sequence, typename N>
31 BOOST_MPL_ASSERT((mpl::equal_to<N, mpl::int_<0> >));
32 typedef typename Sequence::value_type type;
34 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED