Re: shadow variables - pg15 edition

On Thu, 6 Oct 2022 at 20:32, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
>
> On 2022-Oct-06, David Rowley wrote:
> > I didn't want to do it that way because all this code is in a while
> > loop and the outer "now" will be reused after it's set by the code
> > above. It's not really immediately obvious to me what repercussions
> > that would have, but it didn't seem worth taking any risks.
>
> No, it's re-initialized to zero every time through the loop, so setting
> it to something else at the bottom doesn't have any further effect.

Oh yeah, you're right.

> If it were *not* reinitialized every time through the loop, then what
> would happen is that every iteration in the loop (and each operation
> within) would see exactly the same value of "now", because it's only set
> "lazily" (meaning, if already set, don't change it.)

On my misread, that's what I was afraid of changing, but now seeing
that now = 0 at the start of each loop, I understand that
pg_time_now_lazy will get an up-to-date time on each loop.

I'm happy if you want to change it to use the outer scoped variable
instead of the now2 one.

David