[previous] 4503 [next] An expression of 'essentially Boolean' type (%1s) is being used as the left-hand operand of this shift operator (%2s).
Arithmetic type - Operands

This message is issued whenever an expression of essentially Boolean type appears on the left hand side of a shift operator.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4503 --*/

void f4503 (int a, _Bool b)
{
  (a != 0) << 1;            /* 4503 */
  
  b >> 1;                   /* 4503 */
}

MISRA-C:2004 Rules applicable to message 4503:

Rule  10.1  (Required) The value of an expression of integer type shall not be implicitly converted to a different underlying type if: a) it is not a conversion to a wider integer type of the same signedness, or b) the expression is complex, or c) the expression is not constant and is a function argument, or d) the expression is not constant and is a return expression

See also:

QA·C Source Code Analyser 8.1
MISRA-C:2004 Compliance Module 3.2
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