Front page | perl.perl5.porters |
Postings from January 2012
On Tue, Jan 03, 2012 at 10:35:12AM +0000, Nicholas Clark wrote:
> On Tue, Nov 22, 2011 at 10:08:19AM -0500, Matthew Horsfall (alh) wrote:
> > Actually, it gets weirder:
> >
> > perl -we 'print defined(%hash = ())'
> > defined(@array) is deprecated at -e line 1.
> > (Maybe you should just omit the defined()?)
> >
> > OP_RV2AV is explicitly ignored, but I don't quite follow the reason, and
> > OP_AASSIGN incorrectly catches %hash = () as @array = ()...
>
> I don't think that your explanation is quite correct. But I'm not sure what
> the correct mental model is. In that:
>
> $ ./perl -e 'sub foo {}; print defined(() = foo);'
> defined(@array) is deprecated at -e line 1.
> (Maybe you should just omit the defined()?)
>
> It's conflating lists with arrays, and then using the "array" message when
> the thing in question is a list.
Oh, wait. I'm missing the point, aren't I?
$ ./perl -Ilib -c -e 'print defined (@a = ())'
defined(@array) is deprecated at -e line 1.
(Maybe you should just omit the defined()?)
-e syntax OK
$ ./perl -Ilib -c -e 'print defined (%a = ())'
defined(@array) is deprecated at -e line 1.
(Maybe you should just omit the defined()?)
-e syntax OK
$ ./perl -Ilib -c -e 'print defined (() = ())'
defined(@array) is deprecated at -e line 1.
(Maybe you should just omit the defined()?)
-e syntax OK
Whatever is on the left of the AASSIGN is called "array", whether it's an
array, a list or a hash. (I can't think of anything else that's
syntactically valid to put there)
Nicholas Clark
Thread Previous
|
Thread Next