| /*============================================================================= |
| 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_VALUE_AT_IMPL_JUL_07_2011_1348PM) |
| #define BOOST_FUSION_SINGLE_VIEW_VALUE_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> |
| #include <boost/fusion/sequence/intrinsic/value_at.hpp> |
| |
| namespace boost { namespace fusion |
| { |
| struct single_view_tag; |
| |
| namespace extension |
| { |
| template<typename Tag> |
| struct value_at_impl; |
| |
| template<> |
| struct value_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; |
| }; |
| }; |
| } |
| |
| }} |
| |
| #endif |