.. _program_listing_file_lib_time.cc:

Program Listing for File time.cc
================================

|exhale_lsh| :ref:`Return to documentation for file <file_lib_time.cc>` (``lib/time.cc``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   /*
    * Copyright (C) 2019 TU Dresden
    * All rights reserved.
    *
    * Authors:
    *   Christian Menard
    */
   
   // tell MSCV not to worry about the potential unsafe use of localtime
   #ifdef _MSC_VER
   #pragma warning(disable : 4996)
   #endif
   
   #include "reactor-cpp/time.hh"
   
   #include <array>
   #include <ctime>
   #include <iomanip>
   
   namespace reactor {
   
   constexpr size_t TIME_TO_STR_BUFFER_SIZE{20};
   constexpr size_t NANOSECONDS_IN_ONE_SECOND{1'000'000'000UL};
   constexpr size_t NANOSECOND_DIGITS{9};
   
   inline namespace operators {
   
   auto operator<<(std::ostream& os, TimePoint tp) -> std::ostream& {
     std::array<char, TIME_TO_STR_BUFFER_SIZE> buf{};
     time_t time =
         std::chrono::system_clock::to_time_t(std::chrono::time_point_cast<std::chrono::system_clock::duration>(tp));
     auto res = std::strftime(buf.data(), sizeof(buf), "%Y-%m-%d %H:%M:%S", std::localtime(&time));
     auto epoch = std::chrono::duration_cast<Duration>(tp.time_since_epoch());
   
     if (res != 0) {
       os << buf.data() << '.' << std::setw(NANOSECOND_DIGITS) << std::setfill('0')
          << epoch.count() % NANOSECONDS_IN_ONE_SECOND;
     } else {
       os << "[INVALID TIME]";
     }
   
     return os;
   }
   
   auto operator<<(std::ostream& os, std::chrono::seconds dur) -> std::ostream& {
     os << dur.count() << " secs";
     return os;
   }
   auto operator<<(std::ostream& os, std::chrono::milliseconds dur) -> std::ostream& {
     os << dur.count() << " msecs";
     return os;
   }
   auto operator<<(std::ostream& os, std::chrono::microseconds dur) -> std::ostream& {
     os << dur.count() << " usecs";
     return os;
   }
   auto operator<<(std::ostream& os, std::chrono::nanoseconds dur) -> std::ostream& {
     os << dur.count() << " nsecs";
     return os;
   }
   
   } // namespace operators
   
   } // namespace reactor