system_clock度量 Unix 时间(即从协调世界时 (UTC) 1970 年 1 月 1 日星期四 00:00:00 开始的时间,不计闰秒)。 (C++20 起) 时间点族 定义于命名空间std::chrono template<classDuration> usingsys_time=std::chrono::time_point<std::chrono::system_clock, Duration>; ...
{usingnamespacestd::chrono_literals;conststd::time_tt=std::time(nullptr);// usually has "1 second" precisionconstautofrom=std::chrono::system_clock::from_time_t(t);std::this_thread::sleep_for(500ms);constautodiff=std::chrono::system_clock::now()-from;std::cout<<diff<<" ("<<std...
{ // 老办法 std::time_t oldt = std::time({}); std::this_thread::sleep_for(2700ms); // 新办法 auto const now = std::chrono::system_clock::now(); std::time_t newt = std::chrono::system_clock::to_time_t(now); std::cout << "newt - oldt == " << newt - oldt <...
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(...
double Aws::DeviceFarm::Model::CPU::GetClock()const inline The clock speed of the device'sCPU, expressed in hertz (Hz). For example, a 1.2 GHzCPUis expressed as 1200000000. Definition at line74of fileCPU.h. constAws::String& Aws::DeviceFarm::Model::CPU::GetFrequency()const ...
Clock Selection Time Support GUID Support Sequence Number Support Exception Codes Return Codes Status Kinds QoS Policies ASYNCHRONOUS_PUBLISHER AVAILABILITY BATCH DATABASE DATA_READER_PROTOCOL DATA_READER_RESOURCE_LIMITS DATA_WRITER_PROTOCOL DATA_WRITER_RESOURCE_LIMITS DEADLINE DESTINATION_ORDER DISCOVERY DISCOV...
static std::chrono::system_clock::time_point from_time_t( std::time_t t ) noexcept; (C++11 起) 用两个类型间的较低精度,转换 t 为时间点类型。 若time_point 拥有较低精度,则舍入还是截断值是实现定义的。 参数t - 要转换的 std::time_t 值...
4.12.2.1 The clock function See also ctimectime_s (deprecated in C23)(C11) converts atime_tobject to a textual representation (function) time returns the current calendar time of the system as time since epoch (function) C++ documentationforclock...
system_clock (C++11) 来自系统范畴实时时钟的挂钟时间 (类) steady_clock (C++11) 决不会调整的单调时钟 (类) high_resolution_clock (C++11) 拥有可用的最短计数周期的时钟 (类) is_clockis_clock_v (C++20) 确定类型是否为时钟 (类模板)(变量模板) ...
C++ Date and time library std::chrono::system_clock template< class CharT, class Traits, class Duration, class Alloc = std::allocator<CharT> > std::basic_istream<CharT, Traits>& from_stream( std::basic_istream<CharT, Traits>& is, const CharT* fmt, std::chrono::sys_time<Duration>&...