Hi, no, you did not understand: I'm not trying to create object from an interface. I'm having class Foo, that is _NOT_ inheriting Object, but it's still a typed class, and it's implementing interface IFoo. This is (or used to be) legal. I'm creating instances of that class, but the reference is of interface-type:
// ------- test.vala -------
namespace Test
{
public interface IFoo
{
public abstract bool run();
}
public class Foo : IFoo
{
public virtual bool run()
{
return true;
}
}
public static void main()
{
IFoo ifoo = new Foo();
ifoo.run();
return;
}
}
// ----- end test.vala -----
In my opinion it SHOULD be legal. I don't see a point why it's not
legal now, and I don't understand the error message:
error: missing class prerequisite for interface
`Test.IFoo', add GLib.Object to interface declaration if unsure
IFoo ifoo = new Foo();
^^^^
As I'd understand this message, it means that an interface MUST have a
prerequisite of a classed type. It's an absurd, why is it so? Can't I
have an interface not having any prerequisites? Manual suggests so, the
prerequisites list is optional.
best regards,
AW.
>As far as I know, you cannot create objects from interfaces, so the line
>below is wrong:
>
>I rewrote your code in this way and it worked correctly:
>
>namespace Test
>{
> public interface IFoo : Object
> {
> public abstract bool run();
> }
>
> public class Foo : Object, IFoo
> {
> public virtual bool run()
> {
> print("fuck\n");
> return true;
> }
> }
>
> public static void main()
> {
> IFoo ifoo = new Foo();
> ifoo.run();
> return;
> }
>}
>
>If you like to learn how to use polymorphisms in you apps you can see
>my tutorias
>on launchpad <https://launchpad.net/vala-totrials>.
>I wish it can help you...
--
Mój klucz publiczny o identyfikatorze 1024D/E12C5A4C znajduje się na
serwerze hkp://keys.gnupg.net
My public key with signature 1024D/E12C5A4C is on the server
hkp://keys.gnupg.net
signature.asc
Description: PGP signature
_______________________________________________ vala-list mailing list vala-list@gnome.org http://mail.gnome.org/mailman/listinfo/vala-list
