1 /*=============================================================================
2 Copyright (c) 2014 Kohei Takahashi
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
10 #include <boost/config.hpp>
11 #include <boost/fusion/support/config.hpp>
12 #include <boost/fusion/container/vector/detail/config.hpp>
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>
21 ///////////////////////////////////////////////////////////////////////////////
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>
28 namespace boost { namespace fusion
32 namespace vector_detail
34 template <typename I, typename ...T>
40 template <typename Tag>
44 struct value_at_impl<vector_tag>
46 template <typename Sequence, typename N>
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;