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Simplify exchange implementation for pre-C++11

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This commit is contained in:
Glen Fernandes
2018-07-09 08:48:50 -04:00
parent 75ae238d0c
commit 19ec659a91
3 changed files with 58 additions and 21 deletions
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include/boost/core/exchange.hpp
+5 -21
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@@ -15,18 +15,10 @@ Distributed under the Boost Software License, Version 1.0.
#endif
namespace boost {
namespace detail {
template<class T>
struct exchange_type {
typedef T type;
};
} /* detail */
#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template<class T>
inline T exchange(T& t, const typename detail::exchange_type<T>::type& u)
template<class T, class U>
inline T exchange(T& t, const U& u)
{
T v = t;
t = u;
@@ -34,19 +26,11 @@ inline T exchange(T& t, const typename detail::exchange_type<T>::type& u)
}
#else
#if BOOST_WORKAROUND(BOOST_MSVC, < 1800)
template<class T>
inline T exchange(T& t, const typename detail::exchange_type<T>::type& u)
template<class T, class U>
inline T exchange(T& t, U&& u)
{
T v = std::move(t);
t = u;
return v;
}
template<class T>
inline T exchange(T& t, typename detail::exchange_type<T>::type&& u)
{
T v = std::move(t);
t = std::move(u);
t = std::forward<U>(u);
return v;
}
#else