Unused parameters are misleading. Whatever the values passed to such parameters, the behavior will be the same.
See
- MISRA C++:2008, 0-1-11 - There shall be no unused parameters (named or unnamed) in nonvirtual functions.
- MISRA C:2012, 2.7 - There should be no unused parameters in functions
- CERT, MSC12-C. - Detect and remove code that has no effect or is never
executed