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1 /*=============================================================================
2     Copyright (c) 2001-2011 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_COPY_02162011_2308)
8 #define FUSION_COPY_02162011_2308
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 #if defined (BOOST_MSVC)
22 #  pragma warning(push)
23 #  pragma warning (disable: 4100) // unreferenced formal parameter
24 #endif
25 
26 namespace boost { namespace fusion
27 {
28     namespace detail
29     {
30         template <typename Seq1, typename Seq2>
31         struct sequence_copy
32         {
33             typedef typename result_of::end<Seq1>::type end1_type;
34             typedef typename result_of::end<Seq2>::type end2_type;
35 
36             template <typename I1, typename I2>
37             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
38             static void
callboost::fusion::detail::sequence_copy39             call(I1 const&, I2 const&, mpl::true_)
40             {
41             }
42 
43             template <typename I1, typename I2>
44             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
45             static void
callboost::fusion::detail::sequence_copy46             call(I1 const& src, I2 const& dest, mpl::false_)
47             {
48                 *dest = *src;
49                 call(fusion::next(src), fusion::next(dest));
50             }
51 
52             template <typename I1, typename I2>
53             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
54             static void
callboost::fusion::detail::sequence_copy55             call(I1 const& src, I2 const& dest)
56             {
57                 typename result_of::equal_to<I1, end1_type>::type eq;
58                 return call(src, dest, eq);
59             }
60         };
61     }
62 
63     namespace result_of
64     {
65         template <typename Seq1, typename Seq2>
66         struct copy
67             : enable_if<mpl::and_<
68                   traits::is_sequence<Seq1>,
69                   traits::is_sequence<Seq2>
70               > > {};
71     }
72 
73     template <typename Seq1, typename Seq2>
74     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
75     inline typename result_of::copy<Seq1 const, Seq2>::type
copy(Seq1 const & src,Seq2 & dest)76     copy(Seq1 const& src, Seq2& dest)
77     {
78         BOOST_STATIC_ASSERT(
79             result_of::size<Seq1>::value <= result_of::size<Seq2>::value);
80 
81         detail::sequence_copy<
82             Seq1 const, Seq2>::
83             call(fusion::begin(src), fusion::begin(dest));
84     }
85 }}
86 
87 #if defined (BOOST_MSVC)
88 #  pragma warning(pop)
89 #endif
90 
91 #endif
92