MISRA C++:2023 Rule 19.3.2
A macro parameter immediately following a #
operator shall not
be immediately followed by a ##
operator
Since R2024b
Description
Rule Definition
A macro parameter immediately following a #
operator shall
not be immediately followed by a ##
operator. 1
Rationale
The evaluation of the #
and ##
preprocessor
operators does not have a specified execution order. In the case where the
#
operator is executed first, the argument of this operator is
converted into a string literal, which is unlikely to result in a valid token when
pasted to another token by the ##
operator.
Polyspace Implementation
The coding rule checker reports a violation if a ##
follows the
argument of a #
operator in a macro definition.
Troubleshooting
If you expect a rule violation but Polyspace® does not report it, see Diagnose Why Coding Standard Violations Do Not Appear as Expected.
Examples
Check Information
Group: Preprocessing Directives |
Category: Required |
Version History
Introduced in R2024b
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.