Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:58133
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain l-i-e.com designates 67.139.134.202 as permitted sender)
Message-ID: <2ae719b49f99d058544f11c462ce9c8a.squirrel@www.l-i-e.com>
In-Reply-To: 
 <CAAyV7nFNm73qLBEVra-RxHRJzVsLZbOswHw1BJ6KX5g9gUQFdw@mail.gmail.com>
References:
    <CAAyV7nGB3+5KfGNUr2yWUE8qx3y_Dz7EM1u+0pKra4LEqdEjJw@mail.gmail.com>
    <CABBJUpfEaa+Y+Qn6jFMfwemguq3C0=iCpCSfvrMSTouN=-tBFA@mail.gmail.com>
    <CAAyV7nFwwenp5m2G+n5VNnJbU4YC0303SEALMYQ0NaQ9A0hp9Q@mail.gmail.com>
    <4F4A5A03.1010103@php.net>
    <CAAyV7nFNm73qLBEVra-RxHRJzVsLZbOswHw1BJ6KX5g9gUQFdw@mail.gmail.com>
Date: Mon, 27 Feb 2012 09:12:44 -0600
To: "Anthony Ferrara" <ircmaxell@gmail.com>
Cc: "Stefan Neufeind" <neufeind@php.net>,
 internals@lists.php.net
User-Agent: SquirrelMail/1.4.21 [SVN]
MIME-Version: 1.0
Content-Type: text/plain;charset=iso-8859-1
Content-Transfer-Encoding: 8bit
Importance: Normal
Subject: Re: [PHP-DEV] Object Casting - An Alternative to Type Hinting
From: ceo@l-i-e.com ("Richard Lynch")

On Sun, February 26, 2012 8:45 pm, Anthony Ferrara wrote:
>> 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;

I think you meant '.' here instead of '+'

Otherwise, PHP type juggling will make it be 10 as well.

>     }
> }
> class Integer {
>     public function overload+($mixed) {
>         return $this->value + $mixed;
>     }
> }
>
> $int = new Integer(5);
> $string = 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.

That said, there is no inconsistency.

If what you want to do is overload + on strings to do concatenation,
then it's on you to typecast everything to (string) for it to make
sense.

Oh, and string is a reserved word, so this won't work as-is, though
that's obviously picuyane.


-- 
brain cancer update:
http://richardlynch.blogspot.com/search/label/brain%20tumor
Donate:
https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FS9NLTNEEKWBE