Possibility of adding additional arguments to DiagnosticStatusWrapper

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Hi, I'm fairly new to ros diagnostic so please forgive my possible noob question.

I'm using DiagnosticStatusWrapper class in my function to create some diagnostic functionality. I'm following a tutorial from this link.

I have created a function that is very similar to the dummy_diagnostic function, which is on line 48 of the above tutorial. I wanted to know if it is possible to add an additional argument to the dummy_diagnostic function?

To make my question clear: the dummy_diagnostic function is defined as

void dummy_diagnostic(diagnostic_updater::DiagnosticStatusWrapper &stat)

and I would like to add an argument to this function so it should look like this

void dummy_diagnostic(diagnostic_updater::DiagnosticStatusWrapper &stat, const int& threshold)