CERT C:Rec.INT12-C

Do not make assumptions about the type of a plain int bit-field when used in an expression

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描述

规则定义

Do not make assumptions about the type of a plain int bit-field when used in an expression.1

Polyspace 实现

规则检查项会检查未使用合适类型声明的位字段。

示例

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问题

当您声明一个位字段却没有使用合适的类型时，会出现此问题。

风险

使用 int 是由实现定义的，因为 int 类型的位字段可以是 signed 或者 unsigned。

在 C90 中不允许使用 enum、short char 或任何其他类型的位字段，因为行为是未定义的。

在 C99 中，实现可能会定义位字段声明中允许使用的其他整数类型。

检查信息

组：Rec.04.整数 (INT)

版本历史记录

在 R2019a 中推出

另请参阅

主题

外部网站

1 This software has been created by MathWorks incorporating portions of: the “SEI CERT-C Website,” © 2017 Carnegie Mellon University, the SEI CERT-C++ Web site © 2017 Carnegie Mellon University, ”SEI CERT C Coding Standard – Rules for Developing safe, Reliable and Secure systems – 2016 Edition,” © 2016 Carnegie Mellon University, and “SEI CERT C++ Coding Standard – Rules for Developing safe, Reliable and Secure systems in C++ – 2016 Edition” © 2016 Carnegie Mellon University, with special permission from its Software Engineering Institute.

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