Re: [Gretl-devel] global series penetrating into functions problem
Am 16.10.2018 um 16:03 schrieb Allin Cottrell:
On Tue, 16 Oct 2018, oleg_komashko(a)ukr.net wrote:
> Dear Allin,
> This is the way I was afraid of the most.
> Is it possible to have some substitute?
> Say, getvalues(int ID) similar to getinfo()?
My first thought for fixing this (now in git) was to limit access to
series IDs within functions: the function gets to "see" only the IDs
of series that were passed via a series-pointer argument or as members
of a list argument.
I think this was the correct fix, because the other trick was against
the rules.
Now Oleh implies that this change will break some of his functions.
I'm willing to consider an alternative fix but I think we need to be
clear on the rationale for allowing access to series not given to a
function via arguments. (I take it that is what Oleh wants.)
I agree, in the sense that I think such a rationale must be very strong
if the important principle of function encapsulation were to be weakened.
Also it seems to me that the relatively recent possibility to add lists
to bundles makes it easier to have quasi-global availability of a list
(and its series members): just pass the bundle around to the "children"
functions. Another possibility might be to copy the contents (values,
numbers) to a matrix and pass the matrix around.
So, maybe we can help with coming up with alternative solutions for the
need to have "global" access.
cheers,
sven
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