...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
#include <boost/qvm/quat_traits_array.hpp>
namespace boost { namespace qvm { template <class T> T (&ptr_qref( T * ptr ))[4]; } }
A of type "array of 4 elements of type T" to the memory pointed by ptr. This makes it possible to use the array at ptr as a quaternion.