std::chrono::system_clock Defined in header<chrono> classsystem_clock; (since C++11) Classstd::chrono::system_clockrepresents the system-wide real time wall clock. It may not be monotonic: on most systems, the
* TraceFlags -> trace_flags * SystemTimestamp -> timestamp * system_clock::time_point -> timestamp * KeyValueIterable -> attributes * Key value iterable container -> attributes * span<pair<string_view, AttributeValue>> -> attributes(return type of MakeAttributes) */template<class...Argume...
typedefstd::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> time_point; //void logg(const time_point& tp, std::string& name) voidlogg(consttime_point& tp,conststd::string& name) { UNUSED(tp); UNUSED(name); std::cout <<" name: "<< name << std::endl; ...
staticstd::chrono::system_clock::time_pointfrom_time_t(std::time_tt)noexcept; (since C++11) Convertstto a time point type, using the coarser precision of the two types. Iftime_pointhas lower precision, it is implementation defined whether the value is rounded or truncated. ...
A time point representing the current time. Example Run this code #include <chrono>#include <iostream>intmain(){constautonow=std::chrono::system_clock::now();conststd::time_tt_c=std::chrono::system_clock::to_time_t(now);std::cout<<"The system clock is currently at "<<std::ctime(...
Clocks, Durations, Time points Clocks: consist of Epochs and Counting Frequency. Durations: a number of times in a unit of time. Time points: start with special epochs, and elapsed time. 2. examples: auto now = std::chrono::system_clock::now() // get OS clock time 编辑...
system_clock::now(); TC_AutoPtr<Test> a = TC_AutoPtr<Test>(new Test); for (int i = 0; i < exec_times; ++i) { TC_AutoPtr<Test> b = a; } auto end = system_clock::now(); printDuration("TC_AutoPtr copy: ", start, end); } { auto start = system_clock::now(); ...
finish = clock(); duration = (double)(finish - start) / CLOCKS_PER_SEC; printf( "%f seconds\n", duration ); system("pause"); } 在笔者的机器上,运行结果如下: Time to do 10000000 empty loops is 0.03000 seconds 上面我们看到时钟计时单元的长度为1毫秒,那么计时的精度也为1毫秒,那么我们可不...
在C++中,<ctime>是一个标准库头文件,它包含了std::time和std::clock函数,这是一个时间库。要在C++代码中包含这个库,你需要在文件的开头添加以下代码: 代码语言:cpp 复制 #include<ctime> 在C++中,<cstring>是一个标准库头文件,它包含了std::strcmp和std::strlen函数,这是一个字符串库。要在C++代码中包含...
std::chrono::system_clock::from_time_t staticstd::chrono::system_clock::time_pointfrom_time_t(std::time_tt)noexcept; (since C++11) Convertstto a time point type, using the coarser precision of the two types. Iftime_pointhas lower precision, it is implementation defined whether the valu...