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Re: [perl #80628] [PATCH] __SUB__
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From:
demerphq
Date:
December 13, 2010 04:38
Subject:
Re: [perl #80628] [PATCH] __SUB__
Message ID:
AANLkTikke5Vz45ZO5+iCEzEz9FfecfB6SWEVvMtHggyL@mail.gmail.com
On 13 December 2010 13:04, Abigail <abigail@abigail.be> wrote:
> On Mon, Dec 13, 2010 at 12:33:24PM +0100, demerphq wrote:
>> On 13 December 2010 11:42, Abigail <abigail@abigail.be> wrote:
>> > On Mon, Dec 13, 2010 at 11:32:45AM +0100, Johan Vromans wrote:
>> >> [Quoting demerphq, on December 13 2010, 10:48, in "Re: [perl #80628] [P"]
>> >> > This is why i proposed using a $^THIS_SUB "magic tied var" for the purpose.
>> >>
>> >> Sounds like a very good idea to me.
>> >>
>> >> My main objection against __SUB__ is that __XXX__ things are currently
>> >> compile time constants, hence we must avoid introducing __XXX__ things
>> >> that are not. It doesn't contribute to Perl's popularity.
>> >
>> >
>> > I wouldn't say __END__ and __DATA__ (probably the most well-known, and
>> > certainly the most used __XXX__ thingies) are "compile-time constants".
>> >
>> > So, I don't really buy the "__SUB__ confuses me, because it isn't a
>> > compile-time constant" argument.
>> >
>> > __XXX__ things I know about, in order how often I see it used in code:
>> >
>> > __END__: Special token
>> > __DATA__: Special token
>> > __WARN__: Special literal for %SIG
>> > __DIE__: Special literal for %SIG
>> >
>> > <huge gap>
>> >
>> > __FILE__: Compile-time constant
>> > __LINE__: Compile-time constant
>> >
>> >
>> > Now, I'd prefer a short token, and I certainly don't mind having a variable,
>> > so $^SUB now wins for me. But __SUB__ doesn't shout "compile-time constant"
>> > to me. (What constant should it possibly be?)
>>
>> I think johan meant it in the sense that you dont expect to be able to
>> localize, or assign to an __IDENTIFIER__, which fits the use case for
>> this feature.
>>
>
>
> Good point.
>
> But that, IMO, would favour __SUB__ over $^SUB. The latter may give the
> suggestion you can assign to it, or localize, while "the current sub"
> isn't something I associate with as assignable from Perl land.
Yes right. I'm happy with FC's patch, and would like to see it go in.
The only that might be odd with it is that it would return a ref, and
the other things return simple scalar values.
cheers,
Yves
--
perl -Mre=debug -e "/just|another|perl|hacker/"
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