QA·C Help - 0305

	0305	[I] Cast between a pointer to function and an integral type.

Pointers		REFERENCE - ISO:C90-6.3.4 Cast Operators - Semantics

A cast is being performed between an integral type and a pointer to function type, or vice versa.

Any cast which maps integer values to pointer values is by nature implementation-defined. When casting from a pointer type to an integer type, the size of integer which is required will also be implementation defined. However this type of operation is not uncommon in embedded software applications.

For example:


/*PRQA S 2017,2211,3120,3199,3203,3408,3447,3672 ++*/

extern int (* pf)(int x);


extern void foo(void)
{
    unsigned short mus;
    unsigned long mul;

    pf = (int (*)(int x))0xC000U;               /* Message 0305          */

    mul = (unsigned long)pf;                    /* Message 0305          */

    mus = (unsigned short)pf;                   /* Message 0305 and 0309 */
}

See also:

0309 [U] Integral type is not large enough to hold a pointer value.
0313 Casting to different function pointer type.

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