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std::chrono::floor(std::chrono::duration)

Std：：Time：：楼层%28 std：：time：：工期%29

Defined in header ​​
template <class ToDuration, class Rep, class Period> constexpr ToDuration floor(const duration<Rep, Period>& d​(since C++17)

返回最大持续时间t可在ToDuration小于或等于d...

该函数不参与重载解析，除非ToDuration是std::chrono::duration...

参数

d-duration to convert

返回值

d四舍五入为类型的持续时间ToDuration...

可能的实施

模板<class T>结构是[医]持续时间：STD：：false[医]类型{}；模板<类Rep，类周期>结构是[医]持续时间<std：：time：：time<rep，time>>：std：：true[医]类型{}；模板<class到类，类Rep，类周期，class=std：：Enable[医]如果[医]T<IS[医]持续时间<To>{}>到楼层的百分比28持续时间<Rep，期间>&d%29{to t=std：：chrono：：工期[医]铸造<To>%28d%29；如果%28t>d%29返回t-到{1}；返回t；}

*。

例

另见

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

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