Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
Chris@16:     Copyright (c) 2006 Dan Marsden
Chris@16: 
Chris@16:     Distributed under the Boost Software License, Version 1.0. (See accompanying 
Chris@16:     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: ==============================================================================*/
Chris@16: #if !defined(BOOST_FUSION_SWAP_20070501_1956)
Chris@16: #define BOOST_FUSION_SWAP_20070501_1956
Chris@16: 
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <algorithm>
Chris@16: 
Chris@16: #include <boost/fusion/support/is_sequence.hpp>
Chris@16: #include <boost/fusion/view/zip_view.hpp>
Chris@16: #include <boost/fusion/algorithm/iteration/for_each.hpp>
Chris@16: #include <boost/fusion/sequence/intrinsic/front.hpp>
Chris@16: #include <boost/fusion/sequence/intrinsic/back.hpp>
Chris@101: #include <boost/core/enable_if.hpp>
Chris@16: #include <boost/mpl/and.hpp>
Chris@16: 
Chris@16: namespace boost { namespace fusion {
Chris@101: 
Chris@16:     namespace result_of
Chris@16:     {
Chris@16:         template<typename Seq1, typename Seq2>
Chris@16:         struct swap
Chris@101:             : enable_if<mpl::and_<
Chris@101:                   traits::is_sequence<Seq1>,
Chris@101:                   traits::is_sequence<Seq2>
Chris@101:               > > {};
Chris@16:     }
Chris@16: 
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         struct swap
Chris@16:         {
Chris@16:             template<typename Elem>
Chris@16:             struct result
Chris@16:             {
Chris@16:                 typedef void type;
Chris@16:             };
Chris@16: 
Chris@16:             template<typename Elem>
Chris@101:             BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:             void operator()(Elem const& e) const
Chris@16:             {
Chris@16:                 using std::swap;
Chris@16:                 swap(front(e), back(e));
Chris@16:             }
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     template<typename Seq1, typename Seq2>
Chris@101:     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@101:     inline typename result_of::swap<Seq1, Seq2>::type
Chris@16:     swap(Seq1& lhs, Seq2& rhs)
Chris@16:     {
Chris@16:         typedef vector<Seq1&, Seq2&> references;
Chris@16:         for_each(zip_view<references>(references(lhs, rhs)), detail::swap());
Chris@16:     }
Chris@16: }}
Chris@16: 
Chris@16: #endif