| /*============================================================================= |
| 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_SEQUENCE_EMPTY_IMPL_HPP_INCLUDED) |
| #define BOOST_FUSION_SEQUENCE_EMPTY_IMPL_HPP_INCLUDED |
| |
| #include <boost/type_traits/is_convertible.hpp> |
| |
| namespace boost { namespace fusion |
| { |
| struct cons_tag; |
| |
| struct nil; |
| |
| template <typename Car, typename Cdr> |
| struct cons; |
| |
| namespace extension |
| { |
| template <typename Tag> |
| struct empty_impl; |
| |
| template <> |
| struct empty_impl<cons_tag> |
| { |
| template <typename Sequence> |
| struct apply |
| : boost::is_convertible<Sequence, nil> |
| {}; |
| }; |
| } |
| }} |
| |
| #endif |