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