std::chrono::round(std::chrono::duration)
Defined in header <chrono> | ? | ? |
|---|---|---|
template <class ToDuration, class Rep, class Period> constexpr ToDuration round(const duration<Rep, Period>& d); | ? | (since C++17) |
返回值t可在ToDuration这是最接近d如果有两个这样的值，则返回偶数%28，即值t使...t % 2 == 029%。
该函数不参与重载解析，除非ToDuration是std::chrono::duration和std::chrono::treat_as_floating_point<typename ToDuration::rep>::value是false...
参数
d | - | duration to convert |
|---|
返回值
d四舍五入至最接近类型的持续时间ToDuration甚至在半途而废的情况下。
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>{}&%21 std：：rono：：[医]如[医]浮[医]点<typename To::rep>{}>>Conexpr to整数%28 const std：：chrono：：time<rep，期>&d%29{to 0=std：：chrono：：time：<To>%28d%29；to t1=t0+to{1}；自动扩散0=d-t0；自扩散1=t1-d；if%28Diff0==dc 1%29{if%28t0.计数%28%29和1%29返回T1；返回t0；
*。
例
另见
duration_cast | 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) |
ceil(std::chrono::duration) (C++17) | converts a duration to another, rounding up (function template) |
round(std::chrono::time_point) (C++17) | converts a time_point to another, rounding to nearest, ties to even (function template) |
roundlroundllround (C++11)(C++11)(C++11) | nearest integer, rounding away from zero in halfway cases (function) |
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