[boost] [move][core] boost::swap() vs boost::adl_move_swap()

Hi Everyone, I am seeking an advice. I recently got this pull request: https://github.com/boostorg/optional/pull/77 changing the boost::swap() to boost::adl_move_swap() because it should compile faster. Is there any recommendation for Boost libraries which one to prefer and under what circumstances? boost::adl_move_swap() seems to allow moves rather than copies in more cases. On the other hand boost::swap() seems to have other improvements, like BOOST_GPU_ENABLED. Regards, &rzej;