/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(); ...
int main(int argc, char* argv[]) { std::cout << "resolution (nano) = " << (double) std::chrono::high_resolution_clock::period::num / std::chrono::high_resolution_clock::period::den * 1000 * 1000 * 1000 << std::endl; auto t1 = std::chrono::high_resolution_clock::now();...
time_pointstd::chrono::time_point<std::chrono::high_resolution_clock> 成员常量 constexpr boolis_steady [静态] 若时间间隔计次始终为常量,即纵使在外部时钟调整的情况下,调用now()的返回值亦单调递增,则为true,否则为false (公开静态成员常量)
staticstd::chrono::time_point<std::chrono::high_resolution_clock>now()noexcept; (since C++11) Returns a time point representing the current point in time. Parameters (none) Return value A time point representing the current time. Example ...
时钟(clock) 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...
#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-...
high_resolution_clock::period::den * 1000 * 1000 * 1000 << std::endl; 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; ...
在这幅图中,以数据类型为中心,带方向的实线箭头表示该函数能返回相应类型的结果。 clock函数是相对独立的一个函数,它返回进程运行的时间,具体描述见下文。 time_t描述了纪元时间,通过time函数可以获得它。但它只能精确到秒级别。 timespec类型在time_t的基础上,增加了纳秒的精度,通过timespec_get获取。这是C++17上...
std::chrono::high_resolution_clock::time_point started; Timer() { started = std::chrono::high_resolution_clock::now(); } void operator()(std::string msg) { const auto now = std::chrono::high_resolution_clock::now(); const auto ms = std::chrono::duration_cast<std::chrono::microse...
chrono::high_resolution_clock::now() < end); } int main() { auto start = std::chrono::high_resolution_clock::now(); little_sleep(std::chrono::microseconds(100)); auto elapsed = std::chrono::high_resolution_clock::now() - start; std::cout << "waited for " << std::chrono::...