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1 | /*============================================================================= |
2 | Copyright (c) 2007 Tobias Schwinger | |
3 | ||
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 | ==============================================================================*/ | |
7 | #if !defined(BOOST_FUSION_SEQUENCE_EMPTY_IMPL_HPP_INCLUDED) | |
8 | #define BOOST_FUSION_SEQUENCE_EMPTY_IMPL_HPP_INCLUDED | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/type_traits/is_convertible.hpp> | |
12 | #include <boost/fusion/container/list/nil.hpp> | |
13 | ||
14 | namespace boost { namespace fusion | |
15 | { | |
16 | struct cons_tag; | |
17 | ||
18 | struct nil_; | |
19 | ||
20 | template <typename Car, typename Cdr> | |
21 | struct cons; | |
22 | ||
23 | namespace extension | |
24 | { | |
25 | template <typename Tag> | |
26 | struct empty_impl; | |
27 | ||
28 | template <> | |
29 | struct empty_impl<cons_tag> | |
30 | { | |
31 | template <typename Sequence> | |
32 | struct apply | |
33 | : boost::is_convertible<Sequence, nil_> | |
34 | {}; | |
35 | }; | |
36 | } | |
37 | }} | |
38 | ||
39 | #endif |