QA·C Help - 0515

	0515	[C] Equality operator used to compare a pointer with an incompatible operand.

Constraint violations		REFERENCE - ISO:C90-6.3.9 Equality Operators - Constraints

This is a constraint error

An equality operator is being used to compare an operand of pointer type with another operand which is not compatible. An equality.operator can only be used when:

Both operands are of arithmetic type, or
Both operands are pointers to qualified or unqualified versions of compatible types, or
One operand is a pointer to an object or incomplete type and the other is a pointer to a qualified or unqualified version of void, or
One operand has pointer type and the other is a null pointer constant

For example:


/*PRQA S 490,3120,3227,3408,3602,3625 ++*/

int  *pi;

void foo(unsigned long un)
{
    if (pi != un)            /* Message 0515 */
    {
    }

    if (pi == 0x8F00U)       /* Message 0515 */
    {
    }
}

MISRA-C:2004 Rules applicable to message 0515:

Rule 1.1 (Required)

All code shall conform to ISO/IEC 9899:1990 C programming language, ISO 9899, amended and corrected by ISO/IEC 9899/COR1:1995, ISO/IEC 9899/AMD1:1995, and ISO/IEC 9899/COR2: 1996192

See also:

0513 [C] Relational operator used to compare pointers to incompatible types.
0514 [C] Relational operator used to compare a pointer with an incompatible operand.

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MISRA-C:2004 Compliance Module 3.2
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