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Date: Sun, 26 Feb 2012 21:45:45 -0500
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To: Stefan Neufeind <neufeind@php.net>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] Object Casting - An Alternative to Type Hinting
From: ircmaxell@gmail.com (Anthony Ferrara)

> Or operator-overlading to the rescue? :-)

Not quite.  Especially because with operator overloading done at this
level (how it would be implemented in PHP) it's almost impossible to
make it consistent:

class string {
    public function overload+($mixed) {
        return $this->value + $mixed;
    }
}
class Integer {
    public function overload+($mixed) {
        return $this->value + $mixed;
    }
}

$int =3D new Integer(5);
$string =3D new String("5");

echo $int + $string; // 10
echo $string + $int; // 55

While I like the concept of overloading, I don't really think it's
solvable in a consistent enough manner that it would work here.

On Sun, Feb 26, 2012 at 11:12 AM, Stefan Neufeind <neufeind@php.net> wrote:
> On 02/26/2012 04:48 PM, Anthony Ferrara wrote:
>>> I have to say, it doesn't get work, thinking this:
>>>
>>> $mixed1 =3D new Interger(2);
>>> $mixed2 =3D new Interge(3);
>>> $guess_what_type_is =3D $mixed1 + $mixed2;
>>>
>>> thanks
>>
>> That one is actually pretty straight forward. =A0Since `+` is a numeric
>> operation (with the one exception of array + array), it would call
>> castTo('numeric') on both. =A0Then, the normal type rules would take
>> over. =A0So if it returned an int, the result would be int(5). =A0If it
>> returned a float, it would be float(5)...
>
> Or operator-overlading to the rescue? :-)
>
>
> (Okay, I know that idea has been burried a long time ago - but might
> come in hand here as well.
> http://bugs.php.net/bug.php?id=3D9331
> http://pecl.php.net/package/operator
> )
>
>
> Regards,
> =A0Stefan
>
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