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1 | /*============================================================================= | |
2 | Copyright (c) 2014 Kohei Takahashi | |
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 | #ifndef FUSION_VALUE_AT_IMPL_16122014_1641 | |
8 | #define FUSION_VALUE_AT_IMPL_16122014_1641 | |
9 | ||
10 | #include <boost/config.hpp> | |
11 | #include <boost/fusion/support/config.hpp> | |
12 | #include <boost/fusion/container/vector/detail/config.hpp> | |
13 | ||
14 | /////////////////////////////////////////////////////////////////////////////// | |
15 | // Without variadics, we will use the PP version | |
16 | /////////////////////////////////////////////////////////////////////////////// | |
17 | #if !defined(BOOST_FUSION_HAS_VARIADIC_VECTOR) | |
18 | # include <boost/fusion/container/vector/detail/cpp03/value_at_impl.hpp> | |
19 | #else | |
20 | ||
21 | /////////////////////////////////////////////////////////////////////////////// | |
22 | // C++11 interface | |
23 | /////////////////////////////////////////////////////////////////////////////// | |
24 | #include <boost/fusion/container/vector/vector_fwd.hpp> | |
25 | #include <boost/type_traits/declval.hpp> | |
26 | #include <boost/type_traits/remove_cv.hpp> | |
27 | ||
28 | namespace boost { namespace fusion | |
29 | { | |
30 | struct vector_tag; | |
31 | ||
32 | namespace vector_detail | |
33 | { | |
34 | template <typename I, typename ...T> | |
35 | struct vector_data; | |
36 | } | |
37 | ||
38 | namespace extension | |
39 | { | |
40 | template <typename Tag> | |
41 | struct value_at_impl; | |
42 | ||
43 | template <> | |
44 | struct value_at_impl<vector_tag> | |
45 | { | |
46 | template <typename Sequence, typename N> | |
47 | struct apply | |
48 | { | |
49 | typedef typename boost::remove_cv<Sequence>::type seq; | |
50 | typedef typename mpl::identity<decltype(seq::template value_at_impl<N::value>(boost::declval<seq*>()))>::type::type type; | |
51 | }; | |
52 | }; | |
53 | } | |
54 | }} | |
55 | ||
56 | #endif | |
57 | #endif | |
58 |