std::chrono::time_point
STD：：时间：：时间[医]点
| Defined in header | | |
|---|---|---|
| template< class Clock, class Duration = typename Clock::duration > class time_point; | | (since C++11) |
类模板std::chrono::time_point表示时间点。它的实现就好像它存储类型的值一样。Duration的起始时间间隔。Clock%27S时代
成员类型
| Member type | Definition |
|---|---|
| clock | Clock, the clock on which this time point is measured |
| duration | Duration, a std::chrono::duration type used to measure the time since epoch |
| rep | Rep, an arithmetic type representing the number of ticks of the duration |
| period | Period, a std::ratio type representing the tick period of the duration |
成员函数
| (constructor) | constructs a new time point (public member function) |
|---|---|
| time_since_epoch | returns the time point as duration since the start of its clock (public member function) |
| operator+=operator-= | modifies the time point by the given duration (public member function) |
| min static | returns the time point corresponding to the smallest duration (public static member function) |
| max static | returns the time point corresponding to the largest duration (public static member function) |
非会员职能
| std::common_type | specializes the std::common_type trait (class template specialization) |
|---|---|
| operator+operator- | modifies the time point by the given duration (function template) |
| operator==operator!=operator<operator<=operator>operator>= | compares two time points (function template) |
| time_point_cast | converts a time point to another time point on the same clock, with a different duration (function template) |
| floor(std::chrono::time_point) (C++17) | converts a time_point to another, rounding down (function template) |
| ceil(std::chrono::time_point) (C++17) | converts a time_point 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) |
例
二次
#include <iostream>
#include <iomanip>
#include <ctime>
#include <chrono>
int main()
{
std::chrono::system_clock::time_point now = std::chrono::system_clock::now(
std::time_t now_c = std::chrono::system_clock::to_time_t(now - std::chrono::hours(24)
std::cout << "24 hours ago, the time was "
<< std::put_time(std::localtime(&now_c), "%F %T") << '\n';
std::chrono::steady_clock::time_point start = std::chrono::steady_clock::now(
std::cout << "Hello World\n";
std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now(
std::cout << "Printing took "
<< std::chrono::duration_cast<std::chrono::microseconds>(end - start).count()
<< "us.\n";
}
二次
可能的产出：
二次
24 hours ago, the time was 2011-10-25 12:00:08
Hello World
Printing took 84us.
二次
另见
| duration (C++11) | a time interval (class template) |
|---|
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