();// 整数时长:要求 duration_castautoint_ms=std::chrono::duration_cast<std::chrono::milliseconds>(t2-t1);// 小数时长:不要求 duration_caststd::chrono::duration<double,std::milli>fp_ms=t2-t1;std::cout<<"f() took "<<fp_ms.count()<<" ms, "<<"or "<<int_ms.count()<<" ...
chrono::steady_clock::time_point t2 = chrono::steady_clock::now(); chrono::duration<double> time_used = chrono::duration_cast<chrono::duration<double>>( t2-t1 ); cout<<"遍历图像用时:"<<time_used.count()<<" 秒。"<<endl; // 关于 cv::Mat 的拷贝 // 直接赋值并不会拷贝数据 cv:...
auto end=chrono::steady_clock::now(); cout<<"Elapsed time in nanoseconds:"<< chrono::duration_cast<chrono::nanoseconds>(end -start).count()<<"ns"<<endl; cout<<"Elapsed time in microseconds:"<< chrono::duration_cast<chrono::microseconds>(end -start).count()<<"µs"<<endl; cout<<...
auto duration = chrono::duration_cast<chrono::milliseconds>(time_diff); cout <<'Operation cost : '<< duration.count() <<'ms'<< endl; 上面这个代码很好的说明了:有了duration和duration_cast,我们可以以任意的精度来描述结果的值。 除了相加和相减,两个时间点还有比较操作:判断一个时间点在另外一个时...
count()返回秒单位 时间转换 获取UNIX时间戳 std::chrono::system_clock::now().time_since_epoch() 返回一个 std::chrono::duration 对象 转换为微秒 auto last = std::chrono::duration_cast<std::chrono::microseconds>(【 std::chrono::duration 对象】.count()) ...
在(C++) - C的这部分语言特性中有很多会降低执行效率。一个例子是dynamic_cast，执行一个dynamic_cast...
duration<double> time_span = duration_cast<duration<double>>(t2 t1); std::cout << "程序运行时间: " << time_span.count() << " 秒" << std::endl; return 0; } 在这个示例中,我们首先包含了<chrono>库,我们使用high_resolution_clock::now()函数获取程序开始和结束时的时间点,通过计算两个时...
count() << std::endl; std::cout << " time elapsed : " << double(std::chrono::duration_cast<std::chrono::milliseconds>(time_span).count()) << " milliseconds" << std::endl; } cudaFree(d_A); cudaFree(d_B); cudaFree(d_C); std::free(h_A); std::free(h_B); std::...
std::chrono::duration<double> duration = std::chrono::system_clock::now() - start; int count = static_cast<int>(duration.count()); std::string uncrypt_message = android::base::StringPrintf("uncrypt_time: %d\n", count); if (status != 0) { ...
(); std::this_thread::sleep_for(std::chrono::milliseconds(500)); // 模拟一个延时操作 auto end = high_resolution_clock::now(); auto time_diff = duration_cast<duration<double>>(end - start); std::cout << "程序执行时间为 " << time_diff.count() << " 秒" << std::endl; ...