Detailed Description

The SafeValueOperator forces a safe value when necessary.

A SafeValueOperator forces a safe value when when parent signal routing is invalid. It also forces a safe value when masked input value is not 0 if UseMask is true; otherwise it forces a safe value when signal routing is invalid. A SafeValueOperator sets signal output value to its last value if UseLast is true; otherwise it sets signal output value to SafeValue. In all the other cases signal output value is set to input value.

Arguments

When operator is used inside a signal its default input is automatically tied to signal's InternalValue or previous operator's output. Its default output is automatically tied to next operator's input or to signal's Value. See also CDP Operator Usage In CDP Signals.

Actual Processing Code of the SafeValueOperator

unsigned int SafeValueOperator<T>::Process()
{
  if (!d->safeValue || !d->signalMask || !d->valueForced || !d->useLastValue || !d->useMask)
    return STATUS_ERROR;

  if(*d->useMask)
    d->SetValueOKBasedOnInputAndMask();
  else
  if(d->signal!=NULL)
  {
    CDPPropertyBase::RoutingStatus_e eStat = d->signal->GetRoutingStatus();
    if(eStat==CDPPropertyBase::e_NotRouted || eStat==CDPPropertyBase::e_Routed)
      *d->valueForced = false;
    else
      *d->valueForced = true;
  }
  if(!*d->valueForced)
  {
    m_output = static_cast<T>(m_input);
    if(Status()!=STATUS_OK)
      if (auto parent = GetParent())
        parent->RunInComponentThread([=](){ parent->RemoveStatus(GetNodeID()); });
  }
  else if(!*d->useLastValue)
  {
    m_output = static_cast<T>(*d->safeValue);
    if(Status()!=STATUS_SIGNAL_FAULT)
      if (auto parent = GetParent())
        parent->RunInComponentThread([=](){ parent->UpdateStatus(GetNodeID(), STATUS_SIGNAL_FAULT); });
  }

  return Status();
}