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- /*=============================================================================
- Copyright (c) 2011 Eric Niebler
- 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_SINGLE_VIEW_AT_IMPL_JUL_07_2011_1348PM)
- #define BOOST_FUSION_SINGLE_VIEW_AT_IMPL_JUL_07_2011_1348PM
- #include <boost/fusion/support/config.hpp>
- #include <boost/mpl/int.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/mpl/equal_to.hpp>
- namespace boost { namespace fusion
- {
- struct single_view_tag;
- namespace extension
- {
- template<typename Tag>
- struct at_impl;
- template<>
- struct at_impl<single_view_tag>
- {
- template<typename Sequence, typename N>
- struct apply
- {
- BOOST_MPL_ASSERT((mpl::equal_to<N, mpl::int_<0> >));
- typedef typename Sequence::value_type type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence& seq)
- {
- return seq.val;
- }
- };
- };
- }
- }}
- #endif
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