Re: [Vala] Compact classes in HashTable

["Michael 'Mickey' Lauer" <mickey vanille-media de>]

On Wednesday 27 May 2009 06:47:23 Yu Feng wrote:
> > I read about HashTable<>.full, but this won't help in my case, since I
> > can't seem to access the respective free function from Vala.
>
> One workaround is to declare the corresponding free function generated
> by vala as an external static member of the compact class.

Right, while being cumbersome, this seems to work:

[Compact]
public class Foo
{
    public Foo()
    {
        message( "foo created" );
    }
    ~Foo()
    {
        message( "foo destructed" );
    }
    [CCode (cname = "foo_free")]
    public extern void free();
}

...

foos = new HashTable<string,Foo>.full(str_hash, str_equal, g_free, Foo.free);

> > What can i do? Is Gee handling this better?
>
> Yes.

Not quite -- at least not with compact classes:

x.vala:24.28-24.30: error: duplicating Foo instance, use unowned variable or 
explicitly invoke copy method
        foos = new HashMap<string,Foo>( str_hash, str_equal );
                                  ^^^

Using a weak Foo here gets it to compile, but defeats the purpose as the 
instance would get unref'd right after it gets out of scope.

:M: