std::chrono::ceil(std::chrono::duration)
From cppreference.com
Defined in header <chrono>
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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.
Contents |
[edit] Parameters
d | - | duration to convert |
[edit] Return value
d rounded up to a duration of type ToDuration
.
[edit] 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; } |
[edit] Example
Run this code
#include <chrono> #include <iostream> 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
[edit] See also
(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) |
converts a time_point to another, rounding up (function template) | |
(C++11)(C++11) |
nearest integer not less than the given value (function) |