Boost C++ Libraries

// In header: <boost/move/unique_ptr.hpp>

template<typename T, typename U> 
class is_rvalue_convertible {
public:
  // member classes/structs/unions

  class false_t {
  };

  // private static functions
  static false_t dispatch(...);
  static true_t dispatch(U);
  static t_from trigger();

  // public data members
  static const bool value;
};