Examples of errors detected by the V669 diagnostic

V669. Argument is a non-constant reference. The analyzer is unable to determine the position where this argument is modified. Consider checking the function for an error.

WinMerge

V669 The 'sel1' argument is a non-constant reference. The analyzer is unable to determine the position at which this argument is being modified. It is possible that the function contains an error. dirview.cpp 1322

bool CDirView::OpenOneItem(
  UINT_PTR pos1, DIFFITEM **di1, DIFFITEM **di2,
  String &path1, String &path2, int & sel1, bool & isDir)
{
  ....
  // Variable 'sel1' don't modified.
  ....
}

CryEngine 3 SDK

V669 The 'outThreat' argument is a non-constant reference. The analyzer is unable to determine the position at which this argument is being modified. It is possible that the function contains an error. targettrackthreatmodifier.cpp 48

void CTargetTrackThreatModifier::ModifyTargetThreat(
  IAIObject &ownerAI, IAIObject &targetAI,
  const ITargetTrack &track,
  float &outThreatRatio,
  EAITargetThreat &outThreat) const
{
  if (track.GetTargetType() > AITARGET_SOUND &&
      outThreat >= AITHREAT_AGGRESSIVE)
  {
    outThreatRatio = 1.0f;
  }
}

Similar errors can be found in some other places:

• V669 The 'chatter', 'actorId' arguments are non-constant references. The analyzer is unable to determine the position at which this argument is being modified. It is possible that the function contains an error. battlechatter.cpp 418

Micro-Manager

V669 The 'offset' argument is a non-constant reference. The analyzer is unable to determine the position at which this argument is being modified. It is possible that the function contains an error. pgFocus.cpp 356

int pgFocus::GetOffset(double& offset)
{
  MM_THREAD_GUARD_LOCK(&mutex);
  deviceInfo_.offset = offset;
  MM_THREAD_GUARD_UNLOCK(&mutex);
  return DEVICE_OK;
}

Strange code. Most likely this is what should be written here: offset = deviceInfo_.offset;

CMaNGOS

V669 The 'uiHealedAmount' argument is a non-constant reference. The analyzer is unable to determine the position at which this argument is being modified. It is possible that the function contains an error. boss_twinemperors.cpp 109

void
HealedBy(Unit* pHealer, uint32& uiHealedAmount) override
{
  if (!m_pInstance)
    return;

  if (Creature* pTwin =
      m_pInstance->GetSingleCreatureFromStorage(
        m_creature->GetEntry() == NPC_VEKLOR ?
                                  NPC_VEKNILASH :
                                  NPC_VEKLOR))
  {
      float fHealPercent = ((float)uiHealedAmount) /
                           ((float)m_creature->GetMaxHealth());

      uint32 uiTwinHeal =
        (uint32)(fHealPercent * ((float)pTwin->GetMaxHealth()));

      uint32 uiTwinHealth = pTwin->GetHealth() + uiTwinHeal;

      pTwin->SetHealth(uiTwinHealth < pTwin->GetMaxHealth() ?
                                      uiTwinHealth :
                                      pTwin->GetMaxHealth());
  }
}