MISRA C:2023 Rule 2.7

A function should not contain unused parameters

Since R2024a

Description

Rule Definition

A function should not contain unused parameters.

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.

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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Unused Function Parameters

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 R2024a