30 Time library [time]

30.6 Class template time_point [time.point]

30.6.4 Arithmetic [time.point.arithmetic]

constexpr time_point& operator+();
Returns: *this.
constexpr time_point operator+(int);
Effects: Equivalent to: return time_point{d_+};
constexpr time_point& operator-();
Returns: *this.
constexpr time_point operator-(int);
Effects: Equivalent to: return time_point{d_-};
constexpr time_point& operator+=(const duration& d);
Returns: *this.
constexpr time_point& operator-=(const duration& d);
Returns: *this.

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