1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3 Copyright (c) 2006 Dan Marsden
4
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7==============================================================================*/
8#if !defined(BOOST_FUSION_SWAP_20070501_1956)
9#define BOOST_FUSION_SWAP_20070501_1956
10
11#include <boost/fusion/support/config.hpp>
12#include <algorithm>
13
14#include <boost/fusion/support/is_sequence.hpp>
15#include <boost/fusion/view/zip_view.hpp>
16#include <boost/fusion/algorithm/iteration/for_each.hpp>
17#include <boost/fusion/sequence/intrinsic/front.hpp>
18#include <boost/fusion/sequence/intrinsic/back.hpp>
19#include <boost/core/enable_if.hpp>
20#include <boost/mpl/and.hpp>
21
22namespace boost { namespace fusion {
23
24 namespace result_of
25 {
26 template<typename Seq1, typename Seq2>
27 struct swap
28 : enable_if<mpl::and_<
29 traits::is_sequence<Seq1>,
30 traits::is_sequence<Seq2>
31 > > {};
32 }
33
34 namespace detail
35 {
36 struct swap
37 {
38 template<typename Elem>
39 struct result
40 {
41 typedef void type;
42 };
43
44 template<typename Elem>
45 BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
46 void operator()(Elem const& e) const
47 {
48 using std::swap;
49 swap(front(e), back(e));
50 }
51 };
52 }
53
54 template<typename Seq1, typename Seq2>
55 BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
56 inline typename result_of::swap<Seq1, Seq2>::type
57 swap(Seq1& lhs, Seq2& rhs)
58 {
59 typedef vector<Seq1&, Seq2&> references;
60 for_each(zip_view<references>(references(lhs, rhs)), detail::swap());
61 }
62}}
63
64#endif
65