Behavior of CommandLineParser::has() [closed]

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I suppose CommandLineParser::has("something") should be true when the command line has --something in it? The following code shows some contradictory behavior.

cout << "yo " << parser.get<int>("cam_id") << endl;
cout << "ya " << parser.has("cam_id") << endl;

When run with the input --cam_id=22 gives the following output:

yo 22
ya 0

I was expecting it to be ya 1as well. How would I detect if the input has has a certain parameter.