MISRA C++:2008 Rule 3-4-1
An identifier declared to be an object or type shall be defined in a block that minimizes its visibility
描述
规则定义
An identifier declared to be an object or type shall be defined in a block that minimizes its visibility. 1
理由
在尽可能小的模块作用域内定义变量,可以降低这些变量日后被意外访问的可能性。
例如,如果某个对象仅在一个函数中访问,请将该对象声明为该函数的局部对象。
Polyspace 实现
规则检查项会判断某个对象是否仅在一个模块中使用。如果对象在一个模块中使用,但在该模块外部定义,检查项将判定为违规。
故障排除
如果您预计存在违规,而 Polyspace® 未报告该违规,请参阅Diagnose Why Coding Standard Violations Do Not Appear as Expected。
示例
检查信息
组:基本概念 |
类别:必需 |
版本历史记录
在 R2013b 中推出
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.