| Defined in header <chrono> | ||
|---|---|---|
template <class ToDuration, class Rep, class Period> constexpr ToDuration floor(const duration<Rep, Period>& d); | (since C++17) |
Returns the greatest duration t representable in ToDuration that is less or equal to d.
The function does not participate in the overload resolution unless ToDuration is an instance of std::chrono::duration.
Parameters
| d | - | duration to convert |
Return value
d rounded down to a duration of type ToDuration.
Possible implementation
template <class T> struct is_duration : std::false_type {};
template <class Rep, class Period> struct is_duration<
std::chrono::duration<Rep, Period>> : std::true_type {};
template <class To, class Rep, class Period,
class = std::enable_if_t<is_duration<To>{}>>
constexpr To floor(const duration<Rep, Period>& d)
{
To t = std::chrono::duration_cast<To>(d);
if (t > d)
--t;
return t;
} |
Example
See also
| converts a duration to another, with a different tick interval (function template) | |
| (C++17) | converts a duration to another, rounding up (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 down (function template) |
| nearest integer not greater than the given value (function) |
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