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Sane swap() for rvalue-aware compilers

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When we detect that compiler supports rvalue references, we implement swap() in term of moves (as intuition suggests).
Otherwise we fall back to old tricks with default constructor+swap
This commit is contained in:
Andrzej Krzemienski
2015-05-18 16:51:12 +02:00
parent ff90f939ed
commit 4e7405a233
1 changed files with 9 additions and 0 deletions
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9
include/boost/optional/optional.hpp
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@ -1543,9 +1543,18 @@ struct swap_selector<false>
} // namespace optional_detail
#if (!defined BOOST_NO_CXX11_RVALUE_REFERENCES) && (!defined BOOST_CONFIG_RESTORE_OBSOLETE_SWAP_IMPLEMENTATION)
template<class T>
struct optional_swap_should_use_default_constructor : boost::false_type {} ;
#else
template<class T>
struct optional_swap_should_use_default_constructor : has_nothrow_default_constructor<T> {} ;
#endif //BOOST_NO_CXX11_RVALUE_REFERENCES
template<class T> inline void swap ( optional<T>& x, optional<T>& y )
//BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value && BOOST_NOEXCEPT_EXPR(boost::swap(*x, *y)))
{