/*
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Copyright 2018 Glen Joseph Fernandes
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(glenjofe@gmail.com)
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Distributed under the Boost Software License, Version 1.0.
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(http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_CORE_EXCHANGE_HPP
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#define BOOST_CORE_EXCHANGE_HPP
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#include <boost/config.hpp>
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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#include <boost/config/workaround.hpp>
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#include <utility>
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#endif
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namespace boost {
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#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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template<class T, class U>
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inline T exchange(T& t, const U& u)
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{
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T v = t;
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t = u;
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return v;
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}
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#else
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#if BOOST_WORKAROUND(BOOST_MSVC, < 1800)
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template<class T, class U>
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inline T exchange(T& t, U&& u)
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{
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T v = std::move(t);
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t = std::forward<U>(u);
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return v;
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}
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#else
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template<class T, class U = T>
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BOOST_CXX14_CONSTEXPR inline T exchange(T& t, U&& u)
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{
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T v = std::move(t);
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t = std::forward<U>(u);
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return v;
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}
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#endif
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#endif
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} /* boost */
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#endif
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