Robert Haas <robertmhaas@gmail.com> writes:
> On Wed, Mar 2, 2022 at 9:35 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> I've not read the whole patch, but this snippet seems fine to me
>> if there's also an #undef at the end of the function.
>> From later emails, it sounds like that's not the common practice in
> similar cases, and I don't personally see the point.
The point is to make it clear that the macro isn't intended to affect
code outside the function. Since C lacks block-scoped macros,
there's no other way to do that.
I concede that a lot of our code is pretty sloppy about this, but
that doesn't make it a good practice.
regards, tom lane