Re: [RFC 2/2] Future Proofing: Pass around pointers to either functions or data

From: Michael Witten <mfwitten@gmail.com>
Date: Mar 30, 2011, 15:02 UTC
Message-ID: <429c193b-6bc6-4f13-bd69-af113a4bd145-mfwitten@gmail.com>
In-Reply-To: <AANLkTi=nxA0BrLruQ9zc_SajH2ghpZX14Ra7QOo9fMBx@mail.gmail.com>

On Wed, 30 Mar 2011 12:09:46 +0200, Erik Faye-Lund <kusmabite@gmail.com> wrote:

Show 12 quoted lines

> On Tue, Mar 29, 2011 at 5:28 PM, Michael Witten <mfwitten@gmail.com> wrote:
>> +#define ALT_ODB_FN_INFO_FUNC(variable, function) \
>> +       union alt_odb_fn_info variable = { \
>> +               .func = (alt_odb_fn_cb)function \
>> +       }
>> +#define ALT_ODB_FN_INFO_DATA(variable, data_) \
>> +       union alt_odb_fn_info variable = { \
>> +               .data = data_ \
>> +       }
>
> We try to stay away from C99 features like this, as it doesn't work on
> all compilers we target.

How about changing it to this:

#define ALT_ODB_FN_INFO_FUNC(variable, function) \
	union alt_odb_fn_info variable; do { \
		variable.func = (alt_odb_fn_cb)function; \
	} while (0)
#define ALT_ODB_FN_INFO_DATA(variable, data_) \
	union alt_odb_fn_info variable; do { \
		variable.data = data_ \
	} while (0)