std::chrono::ceil(std::chrono::duration)

 

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std::chrono::duration

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duration::duration duration::operator= duration::count duration::zero duration::min duration::max duration::operator+duration::operator-	duration::operator++duration::operator-- duration::operator+=duration::operator-=duration::operator*=duration::operator/=duration::operator%=
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Defined in header <chrono>
template <class ToDuration, class Rep, class Period> constexpr ToDuration ceil(const std::chrono::duration<Rep, Period>& d);		(since C++17)

Returns the smallest duration t representable in ToDuration that is greater or equal to d.

The function does not participate in the overload resolution unless ToDuration is a specialization of std::chrono::duration.

Parameters

d

-

duration to convert

Return value

d rounded up to a duration of type ToDuration.

Possible implementation

namespace detail { template<class> inline constexpr bool is_duration_v = false; template<class Rep, class Period> inline constexpr bool is_duration_v< std::chrono::duration<Rep, Period>> = true; }   template <class To, class Rep, class Period, class = std::enable_if_t<detail::is_duration_v<To>>> constexpr To ceil(const std::chrono::duration<Rep, Period>& d) { To t = std::chrono::duration_cast<To>(d); if (t < d) return t + To{1}; return t; }

Example

Run this code

#include <iostream>
#include <chrono>
 
int main()
{
    using namespace std::chrono_literals;
    using Min = std::chrono::minutes;
 
    std::cout
        << std::showpos
        << "ceil(+2.4min) = " << std::chrono::ceil<Min>(+2.4min).count() << "min\n"
        << "ceil(-2.4min) = " << std::chrono::ceil<Min>(-2.4min).count() << "min\n"
        << "ceil(+0.0min) = " << std::chrono::ceil<Min>(+0.0min).count() << "min\n";
}

Output:

ceil(+2.4min) = +3min
ceil(-2.4min) = -2min
ceil(+0.0min) = +0min

See also

duration_cast (C++11)	converts a duration to another, with a different tick interval (function template)
floor(std::chrono::duration) (C++17)	converts a duration to another, rounding down (function template)
round(std::chrono::duration) (C++17)	converts a duration to another, rounding to nearest, ties to even (function template)
ceil(std::chrono::time_point) (C++17)	converts a time_point to another, rounding up (function template)
ceilceilfceill (C++11)(C++11)	nearest integer not less than the given value (function)