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// PR c++/4377

template < int I1, int I2 >

class unit

{

public:

  typedef unit my_type;

  unit() {}

  unit( const unit& ) {}

   template< int Q1, int Q2 >

   unit< I1 + Q1, I2 + Q2 > operator * ( const unit< Q1, Q2 >& rhs ) const {

     return unit< I1 + Q1, I2 + Q2 >();

   }

  template< int Q1, int Q2 >

  unit< I1 - Q1, I2 - Q2 > operator / ( const unit< Q1, Q2 >& rhs ) const {

    return unit< I1 - Q1, I2 - Q2 >();

  }

};

// specialization added to first test

//

template <>

class unit<0,0> {

public:

  typedef unit<0,0> my_type;

  unit() {}

   friend unit<0,0> operator*( const unit<0,0>& lhs, const unit<0,0>& rhs ) {

     return unit<0,0>();

   }

   friend unit<0,0> operator/( const unit<0,0>& lhs, const unit<0,0>& rhs ) {

     return unit<0,0>();

   }

};

int main()

{

  const unit<1,0> u1;

  const unit<2,0> u2;

  unit<-1,0> u3( u1 / u2 );

  unit< 3,0> u4( u1 * u2 );

}