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MISRA C++:2008 Rule 4-5-2

Expressions with type enum shall not be used as operands to built- in operators other than the subscript operator [ ], the assignment operator =, the equality operators == and !=, the unary & operator, and the relational operators <, <=, >, >=

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描述

规则定义

Expressions with type enum shall not be used as operands to built- in operators other than the subscript operator [ ], the assignment operator =, the equality operators == and !=, the unary & operator, and the relational operators <, <=, >, >=. 1

故障排除

如果您预期会出现违规，而 Polyspace® 未报告该违规，请参阅诊断为何编码规范违规未按预期显示。

示例

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在此示例中，第一个和第二个 if 语句比较了枚举，这并不违反此规则。由于第三个 if 语句对枚举类型执行了算术运算，Polyspace 报告了规则违规。

enum day
{
    monday,
    tuesday,
    wednesday,
    thursday,
    friday,
    saturday,
    sunday
};

day reschedule (day d) {
    if (d == sunday) { //Compliant
        return monday;
    }
    else if (d >= thursday) { //Compliant
        return wednesday;
    }
    else if ( (tuesday + d) >= saturday) { //Noncompliant
        return friday;
    }
}

检查信息

组：标准转换
类别：必需

版本历史记录

在 R2013b 中推出

另请参阅

主题

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.