boost::intrusive::max_pointer_plus_bits<void *, Alignment>
// In header: <boost/intrusive/pointer_plus_bits.hpp> template< Alignment> struct max_pointer_plus_bits<, > { // public data members static value; };
This is a specialization for raw pointers. Raw pointers can embed extra bits in the lower bits if the alignment is multiple of 2pow(NumBits).