On Sun, Dec 05, 2010 at 17:32:17 +0100, Aleksander Wabik wrote: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.No, it is not and never was legal. Interfaces depend on runtime support provided by GObject and therefore only classes derived from GLib.Object may implement interfaces.
Hi,
I think I've found the difference that causes this bug to reproduce or
not. In my whole program where it's not reproductible, I have never
declared interface instance as a local object (IFoo sth in the
function body); I create objects of class Foo, and assign them to
references of type Foo.
The interface is used in functions: function take argument of
interface type IFoo. It works! But if I try to create a reference of
interface type IFoo, error occurs. The demonstration code:
//-------- test.vala --------
namespace Test
{
public interface IFoo
{
public abstract bool run();
}
public class Foo : IFoo
{
public virtual bool run()
{
return true;
}
}
public static bool test(IFoo ifoo)
{
return ifoo.run();
}
public static void main()
{
//IFoo ifoo = new Foo();
Foo ifoo = new Foo();
test(ifoo);
return;
}
}
//------ end test.vala ------
This code will compile fine. But if I uncomment the commented line, and
comment the next one, it SHOULD compile fine too, but it fails with the
same error:
test.vala:23.3-23.6: error: missing class prerequisite for interface
`Test.IFoo', add GLib.Object to interface declaration if unsure
IFoo ifoo = new Foo();
^^^^
So... it is a bug, right?
best regards,
AW.
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