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
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