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Date: Sun, 21 Oct 2012 12:24:14 +0100
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To: Nikita <inefedor@gmail.com>
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Subject: Re: [PHP-DEV] Generics proposal
From: dragoonis@gmail.com (Paul Dragoonis)

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Hi Nikita,

What you're asking for is useful in other languages, but it doesn't match
the style of PHP which is to be a quick and easy type-less scripting
language.

What you're proposing is clearly more suited to something like Java or C#,
but doesn't really belong here.

I'd also hate to see this anywhere near PHP.

Many thanks,
Paul.

On Sat, Oct 20, 2012 at 11:10 PM, Marco Pivetta <ocramius@gmail.com> wrote:

> On 20 October 2012 23:09, Michael Stowe <mikegstowe@gmail.com> wrote:
>
> > I see what you're trying to do but not a big fan of how it's being
> > implemented in the example given.
> >
> > - Mike
> >
> > Sent from my iPhone
> >
> > On Oct 20, 2012, at 4:02 PM, Rasmus Lerdorf <rasmus@lerdorf.com> wrote:
> >
> > > On 10/20/2012 01:59 PM, Nikita wrote:
> > >> Hello, list. I want to propose generics. For those, who don't know
> what
> > it is, here's example: say we have a Comment class, that has a method
> > getBody. Also we have Collection class, that implements Traversable. Now,
> > if I want to validate all insertions into collection of comments, I would
> > need to create CommentCollection class, extend it from Collection, and
> > override all the methods that are dealing with adding new elements to
> > collection. Moreover, I can't have any hints from my IDE about type of
> > collection's elements, so if I'll have code like this:
> > >> foreach ($commentCollection as $comment) {
> > >>    $comment->getBody();
> > >> }
> > >> There will be no way for IDE to know, of what type that object will
> be.
> > >>
> > >> But there's how I could solve my problem with generics:
> > >> class Collection<T> implements Traversable
> > >> {
> > >>    ...
> > >>    public function add(T $element){}
> > >> }
> > >> $collection = new Collection<Comment>();
> > >>
> > >> $collection->add(new Comment());
> > >>
> > >> $collection->add("that will be error");
> > >>
> > >> Actually, that's, again, all about type hinting. If we went so far
> with
> > scalar type hinting, then generics would also be a good addition.
> > >>
> > >> So, what you think?
> > >
> > > Personally I would hate to see this anywhere near PHP.
> > >
> > > -Rasmus
> > >
> > >
> > > --
> > > PHP Internals - PHP Runtime Development Mailing List
> > > To unsubscribe, visit: http://www.php.net/unsub.php
> > >
> >
> > --
> > PHP Internals - PHP Runtime Development Mailing List
> > To unsubscribe, visit: http://www.php.net/unsub.php
> >
> >
> Well, the example just shows what I've already got used to when working
> with Java.
> I like it and it would be of great help to me (especially in reducing the
> amount of code to be tested), but there's a lot more around that, like
> multiple generic types (new Map<Comment, User>()) and how reflection would
> deal with it...
>
> Marco Pivetta
>
> http://twitter.com/Ocramius
>
> http://ocramius.github.com/
>

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