[Gretl-devel] Re: CRASH: passed integer value out-of bounds
On Wed, 3 Mar 2021, Sven Schreiber wrote:
Am 03.03.2021 um 13:31 schrieb atecon:
>
> with latest git version under Ubuntu 18.04 I obtain a crash when
> running the following script:
Confirmed with a recent snapshot on Windows. That one looks pretty bad,
but...
>
> function void simple (const int N[2::])
>
...it doesn't crash anymore for me when removing "const". And only Artur
would put a const in front of an int ;-)
Actually, I believe it is not supported by hansl to do "const int": The
guide says "the const modifier may be used... for all the types that
support the pointer apparatus".
That's right. "const" doesn't have any effect when placed in front
of (non-pointerized) scalar arguments of any sort. Illustration:
<hansl>
function void simple (const int N[2::])
printf "very simple (%d)\n", N
# no error flagged here
N = 24
end function
function void dimple (const matrix m)
printf "very dimple\n"
# this does give an error
m = m + 5
end function
k = 7
simple(k)
print k # note: k is still 7
dimple(I(3))
</hansl>
I guess this is a buglet: either "const" should be disallowed for
plain scalar arguments, or else it should prevent changing the
argument inside the function (although the caller will not inherit a
change in any case).
Allin