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### 1032. Tome utility templates need to be concept-constrained

Section: 27 [time] Status: NAD Concepts Submitter: Alisdair Meredith Opened: 2009-03-11 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Addresses JP 45 [CD1]

`Rep`, `Period`, `Clock` and `Duration` don't correspond to concept.

>     template <class Rep, class Period = ratio<1>> class duration;
>     template <class Clock, class Duration = typename Clock::duration> class time_point;

Make concept for `Rep`, `Period`, `Clock` and `Duration`. Fix 27 [time] and `wait_until` and `wait_for`'s template parameter at 32 [thread].

[ Summit: ]

> We agree that this section needs concepts. We look forward to a paper on this topic. We recommend no action until a paper is available.

Proposed resolution: