C++11 で時間を取得するテストコード

c11_get_time_test.cpp

#include <iostream>
#include <chrono>

// for sleep
#include <thread>

void sleep(unsigned long sleep_time)
{
    std::chrono::milliseconds duration(sleep_time);
    std::this_thread::sleep_for(duration);
}


/*!
 * @brief   エポック時間をミリ秒単位で取得する。
 */
unsigned long getMilliSec()
{
    return static_cast<unsigned int>(
        std::chrono::system_clock::now().time_since_epoch() /
                                        std::chrono::milliseconds(1) );
}

int main()
{
    //------------------------------
    // system_clock test
    std::cout << "* chrono::sytem_clock::Now()" << std::endl;
    auto const st1 = std::chrono::system_clock::now();
    std::cout << "Start Time: " << st1.time_since_epoch().count() << std::endl;
    sleep(1500);
    auto const et1 = std::chrono::system_clock::now();
    std::cout << "End Time: " << et1.time_since_epoch().count() << std::endl;
    auto elapsed_time = std::chrono::duration_cast<std::chrono::milliseconds>(et1 - st1);
    std::cout << "Elapsed Time: " << elapsed_time.count() << std::endl;

    //------------------------------
    // getMilliSec test
    std::cout << "* getMilliSec" << std::endl;
    auto st2 = getMilliSec();
    std::cout << "Start Time: " << st2 << "[ms]" << std::endl;
    sleep(3000);
    auto et2 = getMilliSec();
    std::cout << "End Time: " << et2 << "[ms]" << std::endl;
    std::cout << "Elapsed TIme: " << (et2 - st2) << "[ms]" << std::endl;

    return 0;
}