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Edit File: exchange.hpp

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