boostorg/optional
1
0
Fork 1
mirror of https://github.com/boostorg/optional.git synced 2025-07-29 12:07:21 +02:00
Code Issues Packages Projects Releases Wiki Activity

Sane swap() for rvalue-aware compilers

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

9
include/boost/optional/optional.hpp
View File

@ -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)))
{