C++ else if scope error and enum CommandLine parse issue in ns-3

[압둘하미드이드리스]

Hello,

I was working on an ns-3.45 simulation (using CMake, g++ 13, Ubuntu 22.04). Having tried to implement a function to configure different privacy schemes for vehicles using

an enum SchemeType.

When building, I got these errors:

[ 99%] Building CXX object scratch/CMakeFiles/scratch_ns3_privacy_comparison.dir/ns3_privacy_comparison.cc.o

/home/idrab/ns-3.45/scratch/ns3_privacy_comparison.cc: In function ‘void InstallVehicleApp(ns3::NodeContainer, SchemeType)’:

/home/idrab/ns-3.45/scratch/ns3_privacy_comparison.cc:46:11: error: ‘else’ without a previous ‘if’

   46 |         } else if (scheme == BASELINE_CRYPTO_ONLY) {

      |           ^~~~

...

/home/idrab/ns-3.45/scratch/ns3_privacy_comparison.cc:47:51: error: ‘i’ was not declared in this scope

   47 |             NS_LOG_INFO("[BASELINE1] Vehicle " << i << ": Sending ECC signed pseudonym at " << start << "s");

...

/home/idrab/ns-3.45/scratch/ns3_privacy_comparison.cc:48:41: error: ‘start’ was not declared in this scope

   48 |             Simulator::Schedule(Seconds(start), [](){

...

/home/idrab/ns-3.45/scratch/ns3_privacy_comparison.cc:59:1: error: expected declaration before ‘}’ token

   59 | }

/home/idrab/ns-3.45/src/core/model/command-line.h:811:9: error: no match for ‘operator>>’ (operand types are ‘std::istringstream’ and ‘SchemeType’)

My questions:

How should I properly structure the else if so it compiles inside a loop over vehicles?

Why are i and start undeclared inside my else if blocks?

How can I fix the operator>> error when using CommandLine with my enum SchemeType?

[Gabriel Ferreira]

Based on the error message, I would guess your code looks something like this

void InstallVehicleApp(ns3::NodeContainer, SchemeType)
{
...// undeclared start
...// missing if to start if-else
...{
...}
...else if()
...{
......for (int j = 0; j < max; j++) // should be i
......{
.........NS_LOG_INFO("[BASELINE1] Vehicle " << i << ": Sending ECC signed pseudonym at " << start << "s");
.........Simulator::Schedule(Seconds(start), [](){
.........}
.........// missing ); to close Schedule
......}
...}

[압둘하미드이드리스]

Thanks I will check that out.

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