http://dlang.org/template.html#TemplateThisParameter

That's hardly a descriptive example, so in what context is the feature useful? Some code snippets would be welcome so we can update the page with a nicer and more useful example.

On Mon, 18 Feb 2013 17:14:54 -0500, Andrej Mitrovic <andrej.mitrovich@gmail.com> wrote:

> http://dlang.org/template.html#TemplateThisParameter
>
> That's hardly a descriptive example, so in what context is the feature
> useful? Some code snippets would be welcome so we can update the page
> with a nicer and more useful example.

I actually use it in dcollections :)

What it's nice for is simulating covariance with interface templates:

interface Addable(T)
{
  auto addAll(this R)(T[] stuff)
  {
     foreach(t; stuff) add(t);
     return cast(R)this;
  }

  Addable add(T t);
}


class List(T) : Addable!(T)
{
   List add(T t) { ... }

   // don't need to redefine addAll
}

This became important when operators were forced to be templates.

-Steve

On 2/19/13, Steven Schveighoffer <schveiguy@yahoo.com> wrote:
>     // don't need to redefine addAll

Ah, that sheds a big light on this feature actually, thanks.