QA·C Help - 1478

	1478	Object of an enum type which does not include a zero value, is being implicitly compared against zero in a controlling expression.

Enumerations		REFERENCE - ISO:C90-6.5.2.2 Enumeration Specifiers

The value of an object of enum type is being implicitly compared against 0 in a controlling expression. This is suspicious, since the enumeration list of this enum type does not include a zero value. Note that 0 can always be represented in an object of enum type, regardless of the enumeration list specified, thus the result of this operation is not always 'true'.

For example:


/*PRQA S 1-9999 ++*/
/*PRQA S 1478, 3344 --*/

enum EC { RED = 1, BLUE = 2, GREEN = 3 };

extern void foo(enum EC ex)
{
    if (ex) { }                         /* Message 1478 + 3344 */
}

See also:

1477 Object of enum type is being implicitly compared against zero in a controlling expression.
3344 Controlling expression is not an 'essentially Boolean' expression.

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