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swap implementation

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[SVN r37552]
This commit is contained in:
Dan Marsden
2007-05-01 20:56:32 +00:00
parent da82119dd3
commit 77c04b0e57
1 changed files with 59 additions and 0 deletions
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59
include/boost/fusion/sequence/intrinsic/swap.hpp Normal file
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/*=============================================================================
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/sequence/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& 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