template<class Type > 
struct version<itl::inplace_minus< Type >> :
  public boost::itl::conversion< boost::itl::inplace_minus< Type > >
{
  // types
  typedef version< itl::inplace_minus< Type > >    type;         
  typedef conversion< itl::inplace_minus< Type > > base_type;    
  typedef base_type::argument_type                 argument_type;

  // public member functions
  Type operator()(const Type &) ;
};