MISRA C:2012 Rule 2.7

A function should not contain unused parameters

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Description

Rule Definition

A function should not contain unused parameters1 .

Rationale

If a parameter is unused, it is possible that the implementation of the function does not match its specifications. This rule can highlight such mismatches.

Additional Message in Report

There should be no unused parameters in functions.

Parameter parameter_name is not used.

Troubleshooting

If you expect a rule violation but do not see it, refer to Diagnose Why Coding Standard Violations Do Not Appear as Expected.

Examples

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double func(int param1, int* param2) { /* Non-compliant */
    return (param1/2.0);
}

In this example, the rule is violated because the parameter param2 is not used.

Check Information

Group: Unused code
Category: Advisory
AGC Category: Readability

Version History

Introduced in R2015b

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See Also

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Topics

1 All MISRA coding rules and directives are © Copyright The MISRA Consortium Limited 2021.

The MISRA coding standards referenced in the Polyspace® Bug Finder™ documentation are from the following MISRA standards:

  • MISRA C:2004

  • MISRA C:2012

  • MISRA C:2023

  • MISRA C++:2008

  • MISRA C++:2023

MISRA and MISRA C are registered trademarks of The MISRA Consortium Limited 2021.