1 /*=============================================================================
2     Copyright (c) 2001-2013 Joel de Guzman
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(FUSION_MOVE_01192013_2225)
8 #define FUSION_MOVE_01192013_2225
9 
10 #include <boost/fusion/support/config.hpp>
11 #include <boost/fusion/sequence/intrinsic/begin.hpp>
12 #include <boost/fusion/sequence/intrinsic/end.hpp>
13 #include <boost/fusion/sequence/intrinsic/size.hpp>
14 #include <boost/fusion/sequence/comparison/detail/equal_to.hpp>
15 #include <boost/fusion/support/is_sequence.hpp>
16 #include <boost/config.hpp>
17 #include <boost/static_assert.hpp>
18 #include <boost/utility/enable_if.hpp>
19 #include <boost/mpl/and.hpp>
20 
21 #include <utility> // for std::move
22 
23 #if defined (BOOST_MSVC)
24 #  pragma warning(push)
25 #  pragma warning (disable: 4100) // unreferenced formal parameter
26 #endif
27 
28 namespace boost { namespace fusion
29 {
30     namespace detail
31     {
32         template <typename Seq1, typename Seq2>
33         struct sequence_move
34         {
35             typedef typename result_of::end<Seq1>::type end1_type;
36             typedef typename result_of::end<Seq2>::type end2_type;
37 
38             template <typename I1, typename I2>
39             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
40             static void
callboost::fusion::detail::sequence_move41             call(I1 const&, I2 const&, mpl::true_)
42             {
43             }
44 
45             template <typename I1, typename I2>
46             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
47             static void
callboost::fusion::detail::sequence_move48             call(I1 const& src, I2 const& dest, mpl::false_)
49             {
50                 *dest = std::move(*src);
51                 call(fusion::next(src), fusion::next(dest));
52             }
53 
54             template <typename I1, typename I2>
55             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
56             static void
callboost::fusion::detail::sequence_move57             call(I1 const& src, I2 const& dest)
58             {
59                 typename result_of::equal_to<I1, end1_type>::type eq;
60                 return call(src, dest, eq);
61             }
62         };
63     }
64 
65     namespace result_of
66     {
67         template <typename Seq1, typename Seq2>
68         struct move
69             : enable_if<mpl::and_<
70                   traits::is_sequence<Seq1>,
71                   traits::is_sequence<Seq2>
72               > > {};
73     }
74 
75     template <typename Seq1, typename Seq2>
76     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
77     inline typename result_of::move<Seq1, Seq2>::type
move(Seq1 && src,Seq2 & dest)78     move(Seq1&& src, Seq2& dest)
79     {
80         BOOST_STATIC_ASSERT(
81             result_of::size<Seq1>::value <= result_of::size<Seq2>::value);
82 
83         detail::sequence_move<
84             Seq1, Seq2>::
85             call(fusion::begin(src), fusion::begin(dest));
86     }
87 }}
88 
89 #if defined (BOOST_MSVC)
90 #  pragma warning(pop)
91 #endif
92 
93 #endif
94