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Jacob jacob01 at gmx.netHi Neels,
On 12/16/2016 12:57 PM, Neels Hofmeyr wrote:
> On Thu, Dec 15, 2016 at 02:36:23PM +0100, Jacob wrote:
>
> I thought negative values in enums are fine? What could be a problem here?
> e.g.
>
> enum my_vals {
> MY_VAL_INVALID = -1,
> MY_VAL_A = 0,
> MY_VAL_B,
> MY_VAL_C,
> };
I checked that with C99 and you are right. According to §6.7.2.2 (4) the
compiler must use a signed type for the enum if at least one constant is
a valid negative int. Nevertheless I had some issues with assigning -1
to an enum some time ago, but it might well be that there was no
negative constant involved and I went into some implicit signed/unsigned
conversion hell with differing enum bit sizes or something like that.
Sorry for the noise.
Jacob
>
> ~N
>