algorithm/auxiliary/copy.hpp

0001 /*=============================================================================
0002     Copyright (c) 2001-2011 Joel de Guzman
0003
0004     Distributed under the Boost Software License, Version 1.0. (See accompanying
0005     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 ==============================================================================*/
0007 #if !defined(FUSION_COPY_02162011_2308)
0008 #define FUSION_COPY_02162011_2308
0009
0010 #include <boost/fusion/support/config.hpp>
0011 #include <boost/fusion/sequence/intrinsic/begin.hpp>
0012 #include <boost/fusion/sequence/intrinsic/end.hpp>
0013 #include <boost/fusion/sequence/intrinsic/size.hpp>
0014 #include <boost/fusion/sequence/comparison/detail/equal_to.hpp>
0015 #include <boost/fusion/support/is_sequence.hpp>
0016 #include <boost/config.hpp>
0017 #include <boost/static_assert.hpp>
0018 #include <boost/utility/enable_if.hpp>
0019 #include <boost/mpl/and.hpp>
0020
0021 #if defined (BOOST_MSVC)
0022 #  pragma warning(push)
0023 #  pragma warning (disable: 4100) // unreferenced formal parameter
0024 #endif
0025
0026 namespace boost { namespace fusion
0027 {
0028     namespace detail
0029     {
0030         template <typename Seq1, typename Seq2>
0031         struct sequence_copy
0032         {
0033             typedef typename result_of::end<Seq1>::type end1_type;
0034             typedef typename result_of::end<Seq2>::type end2_type;
0035
0036             template <typename I1, typename I2>
0037             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0038             static void
0039             call(I1 const&, I2 const&, mpl::true_)
0040             {
0041             }
0042
0043             template <typename I1, typename I2>
0044             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0045             static void
0046             call(I1 const& src, I2 const& dest, mpl::false_)
0047             {
0048                 *dest = *src;
0049                 call(fusion::next(src), fusion::next(dest));
0050             }
0051
0052             template <typename I1, typename I2>
0053             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0054             static void
0055             call(I1 const& src, I2 const& dest)
0056             {
0057                 typename result_of::equal_to<I1, end1_type>::type eq;
0058                 return call(src, dest, eq);
0059             }
0060         };
0061     }
0062
0063     namespace result_of
0064     {
0065         template <typename Seq1, typename Seq2>
0066         struct copy
0067             : enable_if<mpl::and_<
0068                   traits::is_sequence<Seq1>,
0069                   traits::is_sequence<Seq2>
0070               > > {};
0071     }
0072
0073     template <typename Seq1, typename Seq2>
0074     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
0075     inline typename result_of::copy<Seq1 const, Seq2>::type
0076     copy(Seq1 const& src, Seq2& dest)
0077     {
0078         BOOST_STATIC_ASSERT(
0079             result_of::size<Seq1>::value <= result_of::size<Seq2>::value);
0080
0081         detail::sequence_copy<
0082             Seq1 const, Seq2>::
0083             call(fusion::begin(src), fusion::begin(dest));
0084     }
0085 }}
0086
0087 #if defined (BOOST_MSVC)
0088 #  pragma warning(pop)
0089 #endif
0090
0091 #endif