QA·C Help - 0660

	0660	[E] Defining an unnamed member in a struct or union. This is a language extension.

Language extensions

Declaring an unnamed member (other than a bit-field) in a struct or union is a language extension.

Structs and unions declared without a name are sometimes described as "anonymous". Various mechanisms exist to access their members. An example is demonstrated in the code below and is identified with message 0662.

For example:


/*PRQA S 553,750,1314,2017,3132,3199,3203,3211,3408,3447 ++*/

struct A1
{
    unsigned int ax;
    struct A2
    {
        unsigned char ay;
        unsigned char az;
    };                                  /* Message 0660 - unnamed struct */
};

struct B1
{
    unsigned int bx;
    union B2
    {
        unsigned long by;
        unsigned char bz[4];
    };                                  /* Message 0660 - unnamed union  */
};

union C1
{
    unsigned int cx;
    union C2
    {
        unsigned long cy;
        unsigned char cz[4];
    };                                  /* Message 0660 - unnamed union  */
};

union D1
{
    unsigned int dx;
    struct D2
    {
        unsigned char dy;
        unsigned char dz;
    };                                  /* Message 0660 - unnamed struct */
};

struct E1
{
    unsigned char ex;
    unsigned int;                       /* Message 0660 - unnamed int    */
    unsigned char ey;
};

extern struct A1 ast;

extern void foo(void)
{
    unsigned int  uia;
    unsigned char uca;

    uia = ast.ax;
    uca = ast.ay;                       /* Message 0662 */
}

MISRA C:2012 Rules applicable to message 0660:

Rule-1.2 (Advisory)

Language extensions should not be used