[Gretl-devel] Re: different degrees of lazy evaluation
On Sat, Jan 14, 2023 at 4:33 AM Sven Schreiber
<sven.schreiber(a)fu-berlin.de> wrote:
Hi, sometimes I was under the impression that hansl supports lazy evaluation of boolean
expressions, and sometimes I thought that no, it doesn't. And turns out I was right
because it seems to depend. Consider this:
<hansl>
clear # neither a nor b exist
eval 1==2 && a==b # lazy works, FALSE no matter what a or b
eval 1==1 || a==b # lazy fails, even though it's always TRUE
</hansl>
Ah, good catch. As opposed to "&&", in the case of "||" only
half of
the apparatus needed to support lazy evaluation was in place. The
other half is now added in git.
Allin