[previous] 4500 [next] An expression of 'essentially Boolean' type (%1s) is being used as an array subscript.
Arithmetic type - Operands

This message is issued whenever an expression of essentially Boolean type has been used as an array subscript.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4500 --*/

void f4500 (int a, _Bool b)
{
  int asi [10];

  asi [a != 0] = 0;         /* 4500 */

  asi [b] = 0;              /* 4500 */
}

MISRA-C:2004 Rules applicable to message 4500:

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

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