LANG.STRUCT.COMMA : Use of Comma Operator

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A use of the comma (,) operator.

(Does not apply to uses of the comma separator.)

Class Name

Use of Comma Operator

Significance

style

Mnemonic

LANG.STRUCT.COMMA

Categories

MisraC2023	MisraC2023:12.3	The comma operator should not be used
Misra2012	Misra2012:12.3	The comma operator should not be used
Misra2004	Misra2004:12.10	The comma operator shall not be used
AUTOSARC++14	AUTOSARC++14:M5-18-1	The comma operator shall not be used.
MisraC++2008	MisraC++2008:5-18-1	The comma operator shall not be used.
MisraC++2023	MisraC++2023:8.19.1	The comma operator should not be used
JSF++	JSF++:168	The comma operator shall not be used.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Use of Comma Operator"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

int lang_struct_comma(int a, int b){         /* comma separator */
  int x,  y;                                 /* comma separator */

  x = (a++, a-b);    /* 'Use of Comma Operator' warning issued here */
  y = x;
  return y;
}

The following configuration file parameters affect checks for this warning class.

LANG.STRUCT.COMMA : Use of Comma Operator

Summary

Properties

Example

Relevant Configuration File Parameters