I haven't been following the $/__dollar/opDollar/etc chronicles very closely, and I can't find the answer in the docs, but I have simple question:

Suppose I have this:

-------------------------------
class Foo
{
    int[] data;

    this(int[] data)
    {
        this.data = data;
    }

    ref T opIndex(size_t i)
    {
        return data[i];
    }
}

void main()
{
    auto foo = Foo([1,2,3,4,5]);
    ...
}
-------------------------------

Question:

Is there currently any way for Foo's author to make "foo[$-1]" work? If so, how?

I think its broken or something. It looks like its trying to find __dollar in the current scope. Because this non-solution seems to work:

module opDollarTest;

import std.stdio;

class Foo
{
    int[] data;

    this(int[] data)
    {
        this.data = data;
    }

    int opIndex(int a)
    {
        return data[a];
    }

    @property
    size_t length()
    {
        return data.length;
    }

    @property
    size_t opDollar()
    {
        return length;
    }
}

void main()
{
    auto foo = new Foo([1,2,3,4,5]);

    size_t __dollar()
    {
        return foo.opDollar();
    }

    writeln(foo[$-1]);
}

On 2011-03-29 19:29, Nick Sabalausky wrote:
> I haven't been following the $/__dollar/opDollar/etc chronicles very closely, and I can't find the answer in the docs, but I have simple question:
[snip]
> Question:
> 
> Is there currently any way for Foo's author to make "foo[$-1]" work? If so, how?

It's not implemented yet: http://d.puremagic.com/issues/show_bug.cgi?id=3474

- Jonathan M Davis