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
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