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.
| d | - | duration to convert |
d rounded up to a duration of type ToDuration.
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;
} |
#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
|
(C++11) | converts a duration to another, with a different tick interval (function template) |
|
(C++17) | converts a duration to another, rounding down (function template) |
|
(C++17) | converts a duration to another, rounding to nearest, ties to even (function template) |
|
(C++17) | converts a time_point to another, rounding up (function template) |
|
(C++11)(C++11) | nearest integer not less than the given value (function) |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/chrono/duration/ceil