...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::movelib::swap
// In header: <boost/move/unique_ptr.hpp> template<typename T, typename D> void swap(unique_ptr< T, D > & x, unique_ptr< T, D > & y);