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+//-----------------------------------------------------------------------------
+// boost variant/detail/move.hpp header file
+// See http://www.boost.org for updates, documentation, and revision history.
+//-----------------------------------------------------------------------------
+//
+//  Copyright (c) 2002-2003 Eric Friedman
+//  Copyright (c) 2002 by Andrei Alexandrescu
+//
+//  Use, modification and distribution are subject to 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)
+//
+//  This file derivative of MoJO. Much thanks to Andrei for his initial work.
+//  See <http://www.cuj.com/experts/2102/alexandr.htm> for information on MOJO.
+//  Re-issued here under the Boost Software License, with permission of the original
+//  author (Andrei Alexandrescu).
+
+
+#ifndef BOOST_VARIANT_DETAIL_MOVE_HPP
+#define BOOST_VARIANT_DETAIL_MOVE_HPP
+
+#include <iterator> // for iterator_traits
+#include <new> // for placement new
+
+#include "boost/config.hpp"
+#include "boost/detail/workaround.hpp"
+#include "boost/mpl/if.hpp"
+#include "boost/type_traits/is_base_and_derived.hpp"
+
+namespace boost {
+namespace detail { namespace variant {
+
+//////////////////////////////////////////////////////////////////////////
+// forward declares
+//
+// NOTE: Incomplete until (if?) Boost.Move becomes part of Boost.
+//
+template <typename Deriving> class moveable;
+template <typename T>        class move_source;
+template <typename T>        class move_return;
+
+namespace detail {
+
+// (detail) moveable_tag
+//
+// Concrete type from which moveable<T> derives.
+//
+// TODO: Move into moveable_fwd.hpp and define has_move_constructor.
+//
+template <typename Deriving>
+struct moveable_tag
+{
+};
+
+} // namespace detail
+
+//////////////////////////////////////////////////////////////////////////
+// function template move
+//
+// Takes a T& and returns, if T derives moveable<T>, a move_source<T> for
+// the object; else, returns the T&.
+//
+
+namespace detail {
+
+// (detail) class template move_type
+//
+// Metafunction that, given moveable T, provides move_source<T>, else T&.
+//
+template <typename T>
+struct move_type
+{
+public: // metafunction result
+
+    typedef typename mpl::if_<
+          is_base_and_derived<detail::moveable_tag<T>, T>
+        , move_source<T>
+        , T&
+        >::type type;
+
+};
+
+} // namespace detail
+
+template <typename T>
+inline
+    typename detail::move_type<T>::type
+move(T& source)
+{
+    typedef typename detail::move_type<T>::type
+        move_t;
+
+    return move_t(source);
+}
+
+//////////////////////////////////////////////////////////////////////////
+// class template return_t
+//
+// Metafunction that, given moveable T, provides move_return<T>, else T.
+//
+template <typename T>
+struct return_t
+{
+public: // metafunction result
+
+    typedef typename mpl::if_<
+          is_base_and_derived<moveable<T>, T>
+        , move_return<T>
+        , T
+        >::type type;
+
+};
+
+//////////////////////////////////////////////////////////////////////////
+// function template move_swap
+//
+// Swaps using Koenig lookup but falls back to move-swap for primitive
+// types and on non-conforming compilers.
+//
+
+#if   defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP)   \
+ ||   BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(2))
+
+// [Indicate that move_swap by overload is disabled...]
+#define BOOST_NO_MOVE_SWAP_BY_OVERLOAD
+
+// [...and provide straight swap-by-move implementation:]
+template <typename T>
+inline void move_swap(T& lhs, T& rhs)
+{
+    T tmp( boost::detail::variant::move(lhs) );
+    lhs = boost::detail::variant::move(rhs);
+    rhs = boost::detail::variant::move(tmp);
+}
+
+#else// !workaround
+
+namespace detail { namespace move_swap {
+
+template <typename T>
+inline void swap(T& lhs, T& rhs)
+{
+    T tmp( boost::detail::variant::move(lhs) );
+    lhs = boost::detail::variant::move(rhs);
+    rhs = boost::detail::variant::move(tmp);
+}
+
+}} // namespace detail::move_swap
+
+template <typename T>
+inline void move_swap(T& lhs, T& rhs)
+{
+    using detail::move_swap::swap;
+
+    swap(lhs, rhs);
+}
+
+#endif // workaround
+
+}} // namespace detail::variant
+} // namespace boost
+
+#endif // BOOST_VARIANT_DETAIL_MOVE_HPP
+
+
+