C++ 高精度时钟获取当前时间 std::chrono::high_resolution_clock::now
创始人
2025-01-10 03:08:14
0

C++ 高精度时钟获取当前时间 std::chrono::high_resolution_clock::now

  • 1. `std::chrono::high_resolution_clock::now`
    • 1.1. Parameters
    • 1.2. Return value
    • 1.3. Example
  • 2. `std::chrono::milliseconds`
  • 3. `std::chrono::microseconds`
    • 3.1. Example
  • References

1. std::chrono::high_resolution_clock::now

Get current time
https://cplusplus.com/reference/chrono/high_resolution_clock/now/

// public static member function static time_point now() noexcept; 

Returns the current time_point in the frame of the high_resolution_clock.

1.1. Parameters

none

1.2. Return value

The time_point representing the current time.

time_point is a member type, defined as an alias of time_point.

1.3. Example

#include  #include  #include  #include   int main() { 	using namespace std::chrono;  	high_resolution_clock::time_point begin = high_resolution_clock::now();  	std::cout << "Printing out 1000 stars...\n"; 	for (int i = 0; i < 1000; ++i) { std::cout << "*"; } 	std::cout << std::endl;  	high_resolution_clock::time_point end = high_resolution_clock::now();  	duration time_span = duration_cast>(end - begin);  	std::cout << "It took me " << time_span.count() << " seconds."; 	std::cout << std::endl;  	return 0; }  

在这里插入图片描述

Printing out 1000 stars... **************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************** It took me 0.0411305 seconds. 请按任意键继续. . . 

time_point is a member type, defined as an alias of time_point.

#include  #include  #include  #include   int main() { 	using namespace std::chrono;  	time_point begin = high_resolution_clock::now();  	std::cout << "Printing out 1000 stars...\n"; 	for (int i = 0; i < 1000; ++i) { std::cout << "*"; } 	std::cout << std::endl;  	time_point end = high_resolution_clock::now();  	duration time_span = duration_cast>(end - begin);  	std::cout << "It took me " << time_span.count() << " seconds."; 	std::cout << std::endl;  	return 0; } 
Printing out 1000 stars... **************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************** It took me 0.033101 seconds. 请按任意键继续. . . 

2. std::chrono::milliseconds

Duration in milliseconds

// class typedef duration < /* see rep below */, milli > milliseconds; 

Instantiation of duration to represent milliseconds.

A millisecond (from milli- and second; symbol: ms) is a unit of time in the International System of Units equal to one thousandth (0.001 or 1 0 − 3 10^{-3} 10−3 or 1/1000) of a second or 1000 microseconds.

1 millisecond (1 ms)

3. std::chrono::microseconds

Duration in microseconds

// class typedef duration < /* see rep below */, micro > microseconds; 

Instantiation of duration to represent microseconds.

A microsecond is a unit of time in the International System of Units (SI) equal to one millionth (0.000001 or 1 0 − 6 10^{-6} 10−6 or 1/1,000,000) of a second. Its symbol is μs, sometimes simplified to us when Unicode is not available.

1 microsecond (1 μs)

3.1. Example

#include  #include  #include  #include   int main() { 	std::chrono::time_point begin = std::chrono::high_resolution_clock::now();  	std::cout << "Printing out 1000 stars...\n"; 	for (int i = 0; i < 1000; ++i) { std::cout << "*"; } 	std::cout << std::endl;  	std::chrono::time_point end = std::chrono::high_resolution_clock::now();  	std::chrono::milliseconds time_span_ms = std::chrono::duration_cast(end - begin); 	std::chrono::microseconds time_span_us = std::chrono::duration_cast(end - begin);  	std::cout << "It took me " << time_span_ms.count() << " milliseconds (ms).\n"; 	std::cout << "It took me " << time_span_us.count() << " microseconds (us).\n"; 	std::cout << std::endl;  	return 0; }  

在这里插入图片描述

Printing out 1000 stars... **************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************************** It took me 33 milliseconds (ms). It took me 33908 microseconds (us).  请按任意键继续. . . 

References

[1] Yongqiang Cheng, https://yongqiang.blog.csdn.net/

相关内容

热门资讯

专业讨论!德扑之星真破解套路(... 专业讨论!德扑之星真破解套路(辅助挂)软件透明挂(有挂了解)-哔哩哔哩;人气非常高,ai更新快且高清...
每日必看!智星德州菠萝外挂检测... 每日必看!智星德州菠萝外挂检测(辅助挂)软件透明挂(有挂教学)-哔哩哔哩1、玩家可以在智星德州菠萝外...
透视透明挂!轰趴十三水有后台(... 轰趴十三水有后台赢率提升策略‌;透视透明挂!轰趴十三水有后台(辅助挂)软件透明挂(有挂详情)-哔哩哔...
发现玩家!德扑ai助手软件(辅... 发现玩家!德扑ai助手软件(辅助挂)透视辅助(有挂教学)-哔哩哔哩;玩家在德扑ai助手软件中需先进行...
一分钟了解!x-poker辅助... 一分钟了解!x-poker辅助软件(辅助挂)辅助透视(有挂攻略)-哔哩哔哩1、每一步都需要思考,不同...
一分钟揭秘!德州最新辅助器(辅... 一分钟揭秘!德州最新辅助器(辅助挂)透视辅助(有挂攻略)-哔哩哔哩;德州最新辅助器最新版本免费下载安...
玩家攻略推荐!德州辅助(辅助挂... 玩家攻略推荐!德州辅助(辅助挂)辅助透视(有挂了解)-哔哩哔哩是由北京得德州辅助黑科技有限公司精心研...
揭秘真相!pokernow德州... 《揭秘真相!pokernow德州(辅助挂)辅助透视(有挂介绍)-哔哩哔哩》 pokernow德州软件...
五分钟了解!德州之星辅助器(辅... 五分钟了解!德州之星辅助器(辅助挂)辅助透视(有挂透明)-哔哩哔哩1、很好的工具软件,可以解锁游戏的...
推荐一款!pokermaste... 1、推荐一款!pokermaster有外挂(辅助挂)透视辅助(有挂教学)-哔哩哔哩;详细教程。2、p...