[pm-h] Interesting Blog Posts on Context & Array vs List

[B. Estrade]

I am just wondering, what's it a start for? I don't get all upset about
language features because this is all optional anyway, but I am curious
about what groundwork this is laying.

Brett


On Fri, Feb 21, 2014 at 10:13 AM, Mark Allen <mrallen1 at yahoo.com> wrote:

> I think it's a pretty great 1st start.  And you *can* have a slurpy arg in
> the final position. Plus everything's still in @_ if you want to be
> traditional or modify stuff using topic variables.
>
>
>   On Friday, February 21, 2014 9:05 AM, B. Estrade <estrabd at gmail.com>
> wrote:
>   So I guess with the signatures, the answer is "it depends" since it'll
> work with signatures as one might expect (i.e., the flattened array would
> have to have each element correspond to a sig parameter) or the sig
> parameter may very well be data type passed by reference.
>
> I read up on the signature thing, and I doubt I'll find it useful for
> anything. It's also experimental, so requires an explicit feature 'use' and
> can be taken out at any time.
>
> http://search.cpan.org/~tonyc/perl-5.19.9/pod/perlsub.pod#Signatures
>
> It seems a squishy and a little general, maybe it'd be better if one could
> specific the Perl data type (scalar, hashref, arrayref, etc) via the
> signature definition.
>
> Brett
>
>
> On Fri, Feb 21, 2014 at 8:03 AM, Uri Guttman <uri at stemsystems.com> wrote:
>
> On 02/21/2014 08:13 AM, B. Estrade wrote:
>
> On Wed, Feb 19, 2014 at 2:35 PM, Mark Allen <mrallen1 at yahoo.com> wrote:
>
>  When subroutine signatures are released in 5.20, you'll be able to do
>
> sub foo ($self, $foo, $bar, $baz) {
>     $foo ||= 'default';
>     $baz //= 0;
>
>     ...;
> }
>
> Yay!
>
>
>
> How will this behave if you call the method with foo(@a, at b, at c, at d) versus
> foo(\@a,\@b,\@c,\@d) ?  Does list flattening still occur in this case
> necessitating the use array references if you want to pass one array per
> parameter?
>
>
> sub calls always flatten into @_. the only way to pass individual arrays
> is by reference. prototypes (not recommended in most cases) do allow arrays
> to be parsed as single args but they are actually passed as references.
>
>
> uri
>
>
> --
> Uri Guttman - The Perl Hunter
> The Best Perl Jobs, The Best Perl Hackers
> http://PerlHunter.com <http://perlhunter.com/>
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