gecko-dev/mozglue/misc/TimeStamp_windows.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_TimeStamp_windows_h
#define mozilla_TimeStamp_windows_h

#include "mozilla/Types.h"

namespace mozilla {

class TimeStamp;

class TimeStampValue
{
  friend struct IPC::ParamTraits<mozilla::TimeStampValue>;
  friend class TimeStamp;

  // Both QPC and GTC are kept in [mt] units.
  uint64_t mGTC;
  uint64_t mQPC;
  bool mHasQPC;
  bool mIsNull;

  MFBT_API TimeStampValue(uint64_t aGTC, uint64_t aQPC, bool aHasQPC);

  MFBT_API uint64_t CheckQPC(const TimeStampValue& aOther) const;

  struct _SomethingVeryRandomHere;
  constexpr MOZ_IMPLICIT TimeStampValue(_SomethingVeryRandomHere* aNullValue)
    : mGTC(0)
    , mQPC(0)
    , mHasQPC(false)
    , mIsNull(true)
  {
  }

public:
  MFBT_API uint64_t operator-(const TimeStampValue& aOther) const;

  TimeStampValue operator+(const int64_t aOther) const
  {
    return TimeStampValue(mGTC + aOther, mQPC + aOther, mHasQPC);
  }
  TimeStampValue operator-(const int64_t aOther) const
  {
    return TimeStampValue(mGTC - aOther, mQPC - aOther, mHasQPC);
  }
  MFBT_API TimeStampValue& operator+=(const int64_t aOther);
  MFBT_API TimeStampValue& operator-=(const int64_t aOther);

  bool operator<(const TimeStampValue& aOther) const
  {
    return int64_t(*this - aOther) < 0;
  }
  bool operator>(const TimeStampValue& aOther) const
  {
    return int64_t(*this - aOther) > 0;
  }
  bool operator<=(const TimeStampValue& aOther) const
  {
    return int64_t(*this - aOther) <= 0;
  }
  bool operator>=(const TimeStampValue& aOther) const
  {
    return int64_t(*this - aOther) >= 0;
  }
  bool operator==(const TimeStampValue& aOther) const
  {
    return int64_t(*this - aOther) == 0;
  }
  bool operator!=(const TimeStampValue& aOther) const
  {
    return int64_t(*this - aOther) != 0;
  }
};

}

#endif /* mozilla_TimeStamp_h */