"Cannot cast from integer to double" error when running an example on Castalia3.3 using Omnet 5.3

2
votes

When I run any example of Castalia 3.3 using Omnet5.3 on ubuntu, for example the connectivityMap one, I got this error:

"Cannot evaluate parameter 'packetSpacing': (omnetpp::cIntParImpl)packetSpacing: Cannot cast from type integer to double -- in module (ConnectivityMap) SN.node[1].Application (id=25), at t=0.003536244016s, event #13" .

When I looked at SensorNetwork.ned file, I found parameters that are of double type

parameters:

double field_x = default (30);          // the length of the deployment field
double field_y = default (30);          // the width of the deployment field
double field_z = default (0);           // the height of the deployment field (2-D field by default)

int numNodes;                       // the number of nodes

string deployment = default ("");

int numPhysicalProcesses = default (1);
string physicalProcessName = default ("CustomizablePhysicalProcess");
string wirelessChannelName = default ("WirelessChannel");
string debugInfoFileName = default ("Castalia-Trace.txt");

Is it a bug problem ? a parameter casting problem with the new version of omnet ? Help me please, I am not that expert with Omnet yet

1
castingomnet++

1 Answers

2
votes

No, this is not a bug, it is an intentional change since OMNeT++ 5.3.
The expression:

(double) par("packetSpacing")

results in calling doubleValue(). There is the following description of this method in cPar.h:

Returns value as double. The cPar type must be DOUBLE.
Note: Implicit conversion from INT is intentionally missing.

  1. Change the type of packetSpacing form int to double in ConnectivityMap.ned.

or

  1. Force reading the parameter as int by adding intValue(), for example in ConnectivityMap.cc:

    packetSpacing = (double) par("packetSpacing").intValue() / 1000.0;