87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
//-----------------------------------------------------------------------------
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// boost variant/detail/move.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2002-2003 Eric Friedman
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// Copyright (c) 2002 by Andrei Alexandrescu
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//
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// This file derivative of MoJO. Much thanks to Andrei for his initial work.
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// See <http://www.cuj.com/experts/2102/alexandr.htm> for information on MOJO.
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// Re-issued here under the Boost Software License, with permission of the original
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// author (Andrei Alexandrescu).
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#ifndef BOOST_VARIANT_DETAIL_MOVE_HPP
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#define BOOST_VARIANT_DETAIL_MOVE_HPP
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#include <iterator> // for iterator_traits
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#include <new> // for placement new
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#include "boost/config.hpp"
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#include "boost/detail/workaround.hpp"
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#include "boost/move/move.hpp"
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namespace boost {
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namespace detail { namespace variant {
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using boost::move;
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//////////////////////////////////////////////////////////////////////////
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// function template move_swap
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//
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// Swaps using Koenig lookup but falls back to move-swap for primitive
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// types and on non-conforming compilers.
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//
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#if defined(BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP) \
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|| BOOST_WORKAROUND(__GNUC__, BOOST_TESTED_AT(2))
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// [Indicate that move_swap by overload is disabled...]
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#define BOOST_NO_MOVE_SWAP_BY_OVERLOAD
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// [...and provide straight swap-by-move implementation:]
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template <typename T>
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inline void move_swap(T& lhs, T& rhs)
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{
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T tmp( boost::detail::variant::move(lhs) );
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lhs = boost::detail::variant::move(rhs);
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rhs = boost::detail::variant::move(tmp);
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}
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#else// !workaround
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namespace detail { namespace move_swap {
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template <typename T>
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inline void swap(T& lhs, T& rhs)
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{
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T tmp( boost::detail::variant::move(lhs) );
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lhs = boost::detail::variant::move(rhs);
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rhs = boost::detail::variant::move(tmp);
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}
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}} // namespace detail::move_swap
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template <typename T>
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inline void move_swap(T& lhs, T& rhs)
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{
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using detail::move_swap::swap;
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swap(lhs, rhs);
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}
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#endif // workaround
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}} // namespace detail::variant
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} // namespace boost
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#endif // BOOST_VARIANT_DETAIL_MOVE_HPP
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