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Date: Wed, 19 May 2010 13:03:59 +0200
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To: Tjerk Anne Meesters <datibbaw@php.net>
Cc: Frederic Hardy <frederic.hardy@mageekbox.net>, PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=0016364d25b142bc6d0486f06a0e
Subject: Re: [PHP-DEV] Constant and expression ?
From: fqqdk@freemail.hu (fqqdk)

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2010/5/19 Tjerk Anne Meesters <datibbaw@php.net>

> On Wed, May 19, 2010 at 5:52 PM, Frederic Hardy
> <frederic.hardy@mageekbox.net> wrote:
> > Hello !
> >>
> >> AFAIK class constants are optimized for speed and therefore don't
> >> support expressions; don't expect this to change any time soon ;-)
> >>
> >>> Is there any feature request about constant and expression ?
> >>> I would like to write something like that :
> >>>
> >>> <?php
> >>>
> >>> namespace foo\bar\directories {
> >>>    const tmp =3D __DIR__ . '/tmp';
> >>> }
> >>>
> >>> ?>
> >
> > So the best solution is something like <?php
> > define('foo\bar\directories\tmp', __DIR__ . '/tmp'); ?>...
> > It 's strange that "define()" function can do something that the "const=
"
> >  keyword can't do, even if "const" keyword evaluation is done at
> compilation
> > time and "define()" evaluation is done at runtime.
>
> That's why there's a cost penalty to using define().
>
> I wrote a small article that gives an idea of the speed differences:
> http://shwup.blogspot.com/2010/04/about-constants.html
>
>
> >
> > Best regards,
> > Fred.
> >
> > --
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > Fr=C3=A9d=C3=A9ric Hardy : Architecte d'application/Admin. syst=C3=A8me=
/Ergonome
> >        Status : En recherche d'emploi
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >
> >
>
>
>
> --
> --
> Tjerk
>
> --
> PHP Internals - PHP Runtime Development Mailing List
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>

How about extending the usage of the 'final' keyword to support a java-like
syntax?

class Foo {
   private static final $bar =3D 'ex' . 'pression';
   // and also
   private final $baz =3D 'another'.'expression';
   // and maybe
   private final $inTheCtor;

   public function __construct($aValue) {
       $this->inTheCtor =3D $value;
   }
}

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