Re: [Vala] [ANNOUNCE] Vala 0.5.2 - Compiler for the GObject type system

[Frederik <scumm_fredo gmx net>]

Jürg Billeter wrote:
> We are pleased to announce version 0.5.2 of Vala, a compiler for the
> GObject type system.

Thank you! My favourite release so far, since some of my favourite bugs
are fixed.

>  * Do not require libgee for foreach statements.

Does that mean I can implement Iterables without libgee? If yes, how?
I can do this, but it requires libgee:

------------
using Gee;

private class RangeIterator : Object, Iterator<int> {

    private Range range;
    private int current;

    public RangeIterator (Range range) {
        this.range = range;
        this.current = range.from;
    }

    public bool next () {
        return this.current <= this.range.to;
    }

    public int get () {
        return this.current++;
    }
}

public class Range : Object, Iterable<int> {

    public int from { get; private set; }
    public int to { get; private set; }

    public Range (int from, int to) {
        assert (from < to);
        this.from = from;
        this.to = to;
    }

    public Type get_element_type () {
        return typeof (int);
    }

    public Iterator<int> iterator () {
        return new RangeIterator (this);
    }
}

static int main (string[] args) {

    foreach (int i in new Range (10, 20)) {
        stdout.printf ("%d\n", i);
    }

    return 0;
}
------------
$ valac --pkg gee-1.0 iterable.vala
$ ./iterable


BTW, this produces a gcc warning, but it works:

iterable.c: In function 'range_iterator_gee_iterator_interface_init':
iterable.c:112: warning: assignment from incompatible pointer type



Regards,

Frederik