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boost::intrusive::pointer_plus_2_bits
template<typename Pointer> struct pointer_plus_2_bits { static const bool value; };
This is class that is supposed to have static methods to embed 2 extra bits of information in a pointer.
This is a declaration and there is no default implementation, because operations to embed bits change with every pointer type.
An implementation that detects that a pointer type whose has_pointer_plus_2_bits<>::value is non-zero can make use of these operations to embed bits in the pointer.