std::chrono::system_clock
Defined in header <chrono> | | |
|---|---|---|
class system_clock; | | (since C++11) |
类std::chrono::system_clock表示系统范围内的实时挂钟。
它可能不是单调的：在大多数系统中，系统时间可以随时调整。它是唯一一个C++时钟，它能够将它的时间点映射到C样式的时间，因此，将被显示。
std::chrono::system_clock满足…的要求TrivialClock...
成员类型
Member type | Definition |
|---|---|
rep | signed arithmetic type representing the number of ticks in the clock's duration 带符号的算术类型，表示时钟持续时间中的滴答数 |
period | a std::ratio type representing the tick period of the clock, in seconds 一个std::ratio类型，表示时钟的滴答周期，以秒为单位 |
duration | std::chrono::duration<rep, period>, capable of representing negative durations Std::chrono::duration<滴答数, 滴答周期>，能够表示负的持续时间 |
time_point | std::chrono::time_point<std::chrono::system_clock> |
成员常数
constexpr bool is_steady static | true if the time between ticks is always constant, i.e. calls to now() return values that increase monotonically even in case of some external clock adjustment (public static member constant) |
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成员函数
now static | returns a std::chrono::time_point representing the current point in time (public static member function) |
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to_time_t static | converts a system clock time point to std::time_t (public static member function) |
from_time_t static | converts std::time_t to a system clock time point (public static member function) |
另见
steady_clock (C++11) | monotonic clock that will never be adjusted (class) |
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high_resolution_clock (C++11) | the clock with the shortest tick period available (class) |
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