Michael Marcin wrote:
The VC team recently released an update to the VC9 standard library that allows them to take advantage of types with fast swap when performing operations like vector realloc. However it appears this optimization is guarded by a trait that must be specialized.
Could we specialize std::_Move_operation_category for this version of VC9 to enable this optimization for boost types that can benefit from it?
I try to stay away from the preprocessor so maybe someone can take this an extend it but how about something like: #if defined(_MSC_VER) # if( _MSC_FULL_VER == 150030729 && _MSC_BUILD == 1 ) // enables fast swap optimization for vc9 sp1 # include <xutility> # define BOOST_MSVC_FAST_SWAP_OPTIMIZATION( Class, Arg ) \ namespace std \ { \ template< class Arg > \ class _Move_operation_category< Class< Arg > > \ { \ public: \ typedef _Swap_move_tag _Move_cat; \ }; \ } # elif defined(BOOST_DETECT_OUTDATED_WORKAROUNDS) && (_MSC_FULL_VER > 150030729) # error "MSVC version is newer than VC9 SP1 if the fast swap optimization still needs to be enabled update the version numbers" # endif #endif #if !defined(BOOST_MSVC_FAST_SWAP_OPTIMIZATION) # define BOOST_MSVC_FAST_SWAP_OPTIMIZATION( Class, Args ) #endif Then take for instance boost/shared_ptr.hpp and add BOOST_MSVC_FAST_SWAP_OPTIMIZATION( boost::shared_ptr, T ) Thanks, Michael Marcin