Re: taking stdbool.h into use

On Thu, Oct 26, 2017 at 10:51 AM, Alvaro Herrera
<alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> I gave this a quick run, to see if my compiler would complain for things
> like this:
>
> bool isprimary = flags & INDEX_CREATE_IS_PRIMARY;
>
> (taken from the first patch at
> https://postgr.es/m/20171023161503.ohkybquxrlech7d7@alvherre.pgsql )
>
> which is assigning a value other than 1/0 to a bool variable without an
> explicit cast. I thought it would provoke a warning, but it does not.
> Is that expected? Is my compiler too old/new?

It seems to me that this proves the point of the proposed patch. You
had better use a zero-equality comparison for such bitwise operation,
and so you ought to do that:
bool isprimary = (flags & INDEX_CREATE_IS_PRIMARY) != 0;
--
Michael