high_resolution_clock 表示实现提供的拥有最小计次周期的时钟。它可以是 system_clock 或 steady_clock 的别名,也可能是第三个独立时钟。 这三个时钟类有一些共同的成员,如下所示: 每种时钟类都有一个 nownow 静态函数来获取当前时间,返回的类型是由该时钟类下的time_point描述。这是一个std::chrono::time_p...
/how-to-convert-stdchronohigh-resolution-clocknow-to-milliseconds-micros int main (int argc, char *argv[]) { std::chrono::time_point< std::chrono::system_clock > now = std::chrono::system_clock::now(); auto duration = now.time_since_epoch(); ...
staticstd::chrono::time_point<std::chrono::high_resolution_clock>now()noexcept; (since C++11) Returns a time point representing the current point in time. Return value A time point representing the current time. Example Run this code
return std::chrono::duration_cast<T>(std::chrono::high_resolution_clock::now().time_since_epoch()); } template <typename T,std::enable_if_t<!std::chrono::high_resolution_clock::is_steady, T>* = nullptr>static T sample() { return std::chrono::duration_cast<T>( std::chrono::ste...
#include <iostream> #include <vector> #include <numeric> #include <chrono> volatile int sink; int main() { for (auto size = 1ull; size < 1000000000ull; size *= 100) { // record start time auto start = std::chrono::high_resolution_clock::now(); // do some work std::vector<...
auto t1 = std::chrono::high_resolution_clock::now(); std::cout << "how much nanoseconds std::cout takes?" << std::endl; auto t2 = std::chrono::high_resolution_clock::now(); auto diff = t2-t1; nanoseconds ns = duration_cast<nanoseconds>(diff); ...
#include<iostream>#include<chrono>intmain(intargc,char**argv){{size_tn=1<<27;std::vector<float>vec(n);typedefstd::chrono::high_resolution_clockClock;autot1=Clock::now();for(size_ti=0;i<vec.size();++i){vec[i]=std::sin(i);}autot2=Clock::now();std::chrono::nanosecondst21=t2-...
class high_resolution_clock; (C++11 起) 类std::chrono::high_resolution_clock 表示实现提供的拥有最小计次周期的时钟。它可以是 std::chrono::system_clock 或std::chrono::steady_clock 的别名,或第三种独立时钟。 std::chrono::high_resolution_clock 满足平凡时钟 (TrivialClock) 的要求。 成员类型...
std::chrono::high_resolution_clock std::chrono::clock_time_conversion std::chrono::duration std::chrono::time_point C 日期和时间工具 std::chrono::is_clock std::chrono::utc_clock std::chrono::tai_clock std::chrono::gps_clock std::chrono::file_clock std::chrono::local_t std::chrono:...
C++11版本的std::chrono支持三种时钟类型system_clock、steady_clock和high_resolution_clock。所谓的高精度时钟high_resolution_clock往往是前两种时钟的别名。system_clock系统时钟往往记录的是UTC系统时间,不单调递增,有回退的可能。steady_clock保证单调递增。个人认为对于一般的用户来说,最重要的知识点是哪个时钟是单调...