class unused_marker;

physinterface.h

unused_marker deliberately fills a variable with invalid data, so that later is_unused() can check whether it was initialized (this is used in all physics params/status/action structures)

union d2i {
  double d;
  uint32 i[2];
};

physinterface.h

union f2i {
  float f;
  uint32 i;
};

physinterface.h

template <class F> unused_marker& operator ,(Quat_tpl & x);

template <class F> unused_marker& operator ,(Vec3_tpl & x);

unused_marker& operator ,(double & x);

unused_marker& operator ,(float & x);

unused_marker& operator ,(int & x);

template <class ref> unused_marker& operator ,(ref *& x);

template <class F> unused_marker& operator ,(strided_pointer & x);

unused_marker& operator ,(unsigned int & x);

unused_marker();