23 General utilities library [utilities]

23.17 Time utilities [time]

23.17.7 Clocks [time.clock]

23.17.7.2 Class steady_­clock [time.clock.steady]

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Objects of class steady_­clock represent clocks for which values of time_­point never decrease as physical time advances and for which values of time_­point advance at a steady rate relative to real time.
That is, the clock may not be adjusted.
class steady_clock {
public:
  using rep        = unspecified;
  using period     = ratio<unspecified, unspecified>;
  using duration   = chrono::duration<rep, period>;
  using time_point = chrono::time_point<unspecified, duration>;
  static constexpr bool is_steady = true;

  static time_point now() noexcept;
};