0467			[C] Operand of '!' must have scalar (arithmetic or pointer) type.
	Constraint violations				REFERENCE - ISO:C90-6.3.3.3 Unary Arithmetic Operators - Constraints

/*PRQA S 3198,3199,2213,3203,3408,3447,3600,3617 ++*/


struct ST { int x; };

extern struct ST field;
extern int *p;
extern int g;

void foo(void)
{
    int r;

    r = !field;                     /* Message 0467 */
    r = !p;                         /* OK           */
    r = !g;                         /* OK           */

}

See also:

• 0536 [C] First operand of '&&', '||' or '?' must have scalar (arithmetic or pointer) type.
• 0537 [C] Second operand of '&&' or '||' must have scalar (arithmetic or pointer) type.