GCC structure initialization

[Svein E. Seldal]

Hello,

I have this:

struct mystruct {
int a;
union {
int b;
int c;
};
};

When I initialize it:

struct mystruct implement = {
.a = 1,
.b = 2
};

I get the following error from gcc:

error: unknown field `b' specified in initializer

Is it possible to do this kind of initialization alltogether with gcc?
How can I initialize the anonymous union in the struct listed above?

I know this is a gcc feature, but I wondered if there anyone here that
might know this, please.


Thanks,
Svein

[Alex]

Re: GCC structure initialization

"Svein E. Seldal" <Svein_dot_Seld al@solidas.com> wrote in message
news:7Y1pc.1453 $RL3.31498@news 2.e.nsc.no...
[snip][color=blue]
> How can I initialize the anonymous union in the struct listed above?[/color]

By making it not anonymous? Questions regarding GCC-specific features should
be asked in a GCC group. Although IIRC, C99 has something similar (or
identical).

Alex

[Martin Ambuhl]

Re: GCC structure initialization

Svein E. Seldal wrote:
[color=blue]
> Hello,
>
> I have this:
>
> struct mystruct {
> int a;
> union {
> int b;
> int c;
> };
> };
>
> When I initialize it:
>
> struct mystruct implement = {
> .a = 1,
> .b = 2
> };
>
> I get the following error from gcc:
>
> error: unknown field `b' specified in initializer
>
> Is it possible to do this kind of initialization alltogether with gcc?
> How can I initialize the anonymous union in the struct listed above?
>
> I know this is a gcc feature, but I wondered if there anyone here that
> might know this, please.[/color]

Anonymous unions are off-topic here. A gnu* newsgroup would do better.
Obviously, naming the union would work here.

<ot>
In your case either
struct mystruct implement = {
.a = 1, {2}
};
or
struct mystruct implement = {
.a = 1
};
implement.b = 2;
should work.
</ot>