was tagged [tech]

2009/7/21 Justin Richards <justin.richards@gmail.com>

> In C18 a union can be described as follows
>
> typedef union _IP_ADDR
> {
>     BYTE        v[4];
>     DWORD       Val;
> } IP_ADDR;
>
>
> Then memory may be referenced as follows [after a variable IP of type
> IP_ADDR is declared]
> i=3;
> IP.v[i];
>
> Can a similar member reference be used with bits.
>
> That is instead of referencing a bit member in the union below as
>
> iomask.bits.b0;
>
> Can it be referenced as
>
> iomask.bits[i]; or perhaps iomask.bits.b[i];
>
> Experimenting with the compiler seems to indicate that it is not possible.
>
> Pointers to examples etc would be greatly appreciated or even what to
> google for.
>
>       union
>         {
>             struct
>             {
>                 unsigned char b0:1;
>                 unsigned char b1:1;
>                 unsigned char b2:1;
>                 unsigned char b3:1;
>                 unsigned char b4:1;
>                 unsigned char b5:1;
>                 unsigned char b6:1;
>                 unsigned char b7:1;
>             } bits;
>             BYTE val;
>         } iomask;
>
> Cheers Justin
>
>
>
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