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Date: Sun, 24 Nov 2013 02:15:26 +0100
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To: Kris Craig <kris.craig@gmail.com>
Cc: Andrea Faulds <ajf@ajf.me>, Derick Rethans <derick@php.net>, 
	Tjerk Meesters <tjerk.meesters@gmail.com>, PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] rfc: pow-operator
From: tyra3l@gmail.com (Ferenc Kovacs)

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On Sun, Nov 24, 2013 at 1:58 AM, Kris Craig <kris.craig@gmail.com> wrote:

> I don't see any benefit in using Python's unique behavior as a model.


they aren't the only ones doing it that way, there were a bunch of
languages mentioned for left, right and no associativity, maybe it would be
useful to list them on the rfc page.


>  The
> model should conform to established mathematical laws, not some other
> arbitrarily chosen scripting language.


the power tower comes from mathematical laws, and that would support the
right association, as mentioned by Jakub in the other thread.


>  According to Order of Operations,
> all operations of the same type within the same context (parentheses) mus=
t
> be processed in order from left to right.  For example, -2 ** 3 ** 2 woul=
d
> be processed from left to right, like this:  pow( pow( -2, 3 ), 2 );
>

see above, and this was also discussed in the other thread.


>
> We've introduced multiple options into RFCs before without encountering t=
he
> problems you mention.  The alternative would be to create a separate RFC
> that calls for behavior that conforms to established arithmetic standards=
.
>  But it makes more sense to me to put that into one RFC rather than havin=
g
> two separate threads to discuss what should be one single issue.
>
> --Kris
>
>
I think it would make sense to extend the rfc with the issues brought up,
and answer them there, because it seems that we started repeating the same
arguments pro and con.

ps: please don't top post.

--=20
Ferenc Kov=C3=A1cs
@Tyr43l - http://tyrael.hu

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