20 General utilities library [utilities]

20.12.5.3 duration arithmetic [time.duration.arithmetic]

constexpr duration operator+() const;

constexpr duration operator-() const;

duration& operator++();

duration operator++(int);

duration& operator--();

duration operator--(int);

duration& operator+=(const duration& d);

duration& operator-=(const duration& d);

duration& operator*=(const rep& rhs);

duration& operator/=(const rep& rhs);

duration& operator%=(const rep& rhs);

duration& operator%=(const duration& rhs);