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Date: Sun, 24 Nov 2013 14:58:36 +0800
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To: Kris Craig <kris.craig@gmail.com>
Cc: Derick Rethans <derick@php.net>, PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] rfc: pow-operator
From: tjerk.meesters@gmail.com (Tjerk Meesters)

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On Sun, Nov 24, 2013 at 8:31 AM, Kris Craig <kris.craig@gmail.com> wrote:

> We should be following standard Order of Operations here.  As such, the
> option of no associativity should be included.  Furthermore, there needs to
> be a voting option regarding how to deal with even exponents of negative
> bases; i.e. treat "-3 ^ 2" as "-3 ^ 2 == 9" or as "-(3 ^ 2) == -9".
>

To support the latter "-3 ** 2 == 9" we would require a unary minus that
has a higher precedence than the exponent operator and as such falls
outside of the scope of this RFC.

That said, I'm not even sure whether we can support a unary minus with the
current parser.


>
> Without those options, my vote would be a firm No.
>
> --Kris
>
>
> On Sat, Nov 23, 2013 at 9:43 AM, Derick Rethans <derick@php.net> wrote:
>
>> On Sat, 23 Nov 2013, Tjerk Meesters wrote:
>>
>> > Hi guys,
>> >
>> > I'm done drafting the RFC for the exponential operator:
>> > https://wiki.php.net/rfc/pow-operator
>> >
>> > Since this is a language feature, voting will only start in two weeks
>> from
>> > now.
>>
>> Something that I missed in there, are you thinking of adding:
>>
>>  **=
>>
>> in there too, just like we have:
>>
>>  $a += 5;
>>
>> cheers,
>> Derick
>>
>> --
>> http://derickrethans.nl | http://xdebug.org
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>>
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>>
>


-- 
--
Tjerk

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