Examples of errors detected by the V669 diagnostic

V669. The 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.

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());
  }
}