hitime.hpp

// Copyright (c) 2015-2019 Paweł Cichocki
// License: https://opensource.org/licenses/MIT

#pragma once

#include <chrono>

#ifdef _MSC_VER

#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#define UNDEF_WIN32_LEAN_AND_MEAN
#endif

#ifndef NOMINMAX
#define NOMINMAX
#define UNDEF_NOMINMAX
#endif

#include <Windows.h>

#ifdef UNDEF_WIN32_LEAN_AND_MEAN
#undef WIN32_LEAN_AND_MEAN
#undef UNDEF_WIN32_LEAN_AND_MEAN
#endif

#ifdef UNDEF_NOMINMAX
#undef NOMINMAX
#undef UNDEF_NOMINMAX
#endif

namespace
{
   const long long g_Frequency = []() -> long long
   {
      LARGE_INTEGER frequency;
      QueryPerformanceFrequency(&frequency);
      return frequency.QuadPart;
   }();
}

struct HighResClock
{
   typedef long long                               rep;
   typedef std::nano                               period;
   typedef std::chrono::duration<rep, period>      duration;
   typedef std::chrono::time_point<HighResClock>   time_point;
   static const bool is_steady = true;

   static inline time_point now()
   {
      LARGE_INTEGER count;
      QueryPerformanceCounter(&count);
      return time_point(duration(count.QuadPart * static_cast<rep>(period::den) / g_Frequency));
   }
};

#else

typedef std::chrono::high_resolution_clock HighResClock;

#endif

#define MICRO_SECS(x) std::chrono::duration_cast<std::chrono::microseconds>(x).count()
#define MILLI_SECS(x) std::chrono::duration_cast<std::chrono::milliseconds>(x).count()
#define SECS(x) std::chrono::duration_cast<std::chrono::seconds>(x).count()