clock.h

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#pragma once
 
#include "di/meta/constexpr.h"
#include "di/meta/core.h"
 
namespace di::concepts {
template<typename T>
concept Clock = requires {
    typename T::Representation;
    typename T::Period;
    typename T::Duration;
    typename T::TimePoint;
    T::is_steady;
    typename meta::Constexpr<T::is_steady>;
    { T::now() } -> SameAs<typename T::TimePoint>;
};
}
 
namespace di {
using concepts::Clock;
}