- friend class Microsecond operator - (const Microsecond& left, const Microsecond& right) throw();
- friend class Microsecond operator + (const Microsecond& left, const Microsecond& right) throw();
- friend class Microsecond operator / (const Microsecond& left, const Microsecond& right) throw();
- friend class Microsecond operator / (const Microsecond& left, const int right) throw();
- friend class Microsecond operator / (const Microsecond& left, const unsigned int right) throw();
+ friend class Microsecond operator - (const Microsecond& left, const Microsecond& right) ;
+ friend class Microsecond operator + (const Microsecond& left, const Microsecond& right) ;
+ friend class Microsecond operator / (const Microsecond& left, const Microsecond& right) ;
+ friend class Microsecond operator / (const Microsecond& left, const int right) ;
+ friend class Microsecond operator / (const Microsecond& left, const unsigned int right) ;