Re: [Vala] [ANNOUNCE] Vala 0.7.6 - Compiler for the GObject type system

[jp0409 jippii fi]

Hi,

Thanks for the great release! Great progress!!

Then the bad news ;-) The output of this one is 0. Is this correct?

JP

-----------

delegate void Func ();

Func goo () {
        int a = 42;
        Func f = () => stdout.printf ("%d\n", a);
        a = 43;
        return f;
}

void main () {
        var f = goo ();
        f ();
}

-----------

> On Fri, 2009-09-18 at 10:11 +0200, Frederik wrote:
> > Great release!
>
> Thanks.
>
> > One question about closures: is it intentional that captured variables
> > change after the closure? For example:
> > 
> > ------------------------------------------------------
> > delegate void Func ();
> > 
> > void main () {
> >    int a = 42;
> >    Func f = () => stdout.printf ("%d\n", a);
> >    a = 43;
> >    f ();
> > }
> > ------------------------------------------------------
> > Output: 43
>
> This is correct, there is only one instance of the variable `a' and that
> instance is captured by the closure. You can also change the value of
> `a' inside the closure and this will affect the outer method as well as
> there is only one instance of this variable.
>
> > This seems to affect currying as well:
> > 
> > ------------------------------------------------------
> > delegate int IntFuncInt (int i);
> > 
> > IntFuncInt curried_add (int a) {
> >     return b => a + b;
> > }
> > 
> > void main () {
> >    int a = 3;
> >    int b = 4;
> >    stdout.printf ("%d + %d = %d\n", a, b, curried_add (a)(b));
> > }
> > ------------------------------------------------------
> > Output: 3 + 4 = 4
>
> This was a bug in how delegates were returned from methods. This is now
> fixed in master.
>
> Jürg
>
> _______________________________________________
> Vala-list mailing list
> Vala-list gnome org
> http://mail.gnome.org/mailman/listinfo/vala-list


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