990. monotonic_clock::is_monotonic must be true

Section: 99 [time.clock.monotonic] Status: C++11 Submitter: Howard Hinnant Opened: 2009-03-09 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

There is some confusion over what the value of monotonic_clock::is_monotonic when monotonic_clock is a synonym for system_clock. The intent is that if monotonic_clock exists, then monotonic_clock::is_monotonic is true.

[ Batavia (2009-05): ]

We agree with the proposed resolution.

Move to Tentatively Ready.

Proposed resolution:

Change 99 [time.clock.monotonic], p1:

-1- Objects of class monotonic_clock represent clocks for which values of time_point never decrease as physical time advances. monotonic_clock may be a synonym for system_clock if and only if system_clock::is_monotonic is true.