Re: [Vala] [SimpleType] public struct Integer : uint {} does not work

[Jonathan Ryan <jryan curious-computing com>]

On Wed, Jan 18, 2012 at 5:20 PM, Jonathan Ryan
<jryan curious-computing com>wrote:

> On Wed, Jan 18, 2012 at 11:56 AM, Henrik /KaarPoSoft <henrik kaarposoft dk
> > wrote:
>
> > Dear all,
> >
> > I am trying to create a new type in vala,
> > like "typedef" in C.
> >
> > http://live.gnome.org/Vala/**Tutorial<http://live.gnome.org/Vala/Tutorial>has this example:
> > /* defining an alias for a basic type (equivalent to typedef int Integer
> > in C)*/
> > [SimpleType]
> > public struct Integer : uint {}
> >
> > However, it does not seem to work...
> >
> > I have created the following file called i.vala:
> > <code>
> > [SimpleType]
> > public struct Integer : uint {
> > }
> > public static int main (string[] args) {return 0;}
> > </code>
> >
> > Compiling with valac i.vala gives:
> > /home/henrik/v1/i.c: In function ‘integer_get_type’:
> > /home/henrik/v1/i.c:22:79: error: ‘integer_dup’ undeclared (first use in
> > this function)
> > /home/henrik/v1/i.c:22:79: note: each undeclared identifier is reported
> > only once for each function it appears in
> > /home/henrik/v1/i.c:22:109: error: ‘integer_free’ undeclared (first use
> > in this function)
> >
> > This is running on Linux Mint 12 (like Ubuntu Oneiric)
> > Vala 0.14.0
> > gcc (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1
> >
> > I tried also using latest version of vala from git:
> > Vala 0.15.0.72-516e7
> > with the same result.
> >
> > valac --save-temps shows only this in i.c:
> > <snip>
> > GType integer_get_type (void) {
> > static volatile gsize integer_type_id__volatile = 0;
> > if (g_once_init_enter (&integer_type_id__volatile)) {
> > GType integer_type_id;
> > integer_type_id = g_boxed_type_register_static ("int32_t",
> > (GBoxedCopyFunc) integer_dup, (GBoxedFreeFunc) integer_free);
> > g_once_init_leave (&integer_type_id__volatile, integer_type_id);
> > }
> > return integer_type_id__volatile;
> > }
> > </snip>
> > So it is obvious that the C compiler barfs,
> > integer_dup and integer_free are never defined.
> >
> >
> > Any help on what I am doing wrong here would be most appreciated!
> >
> > /Henrik
> > ______________________________**_________________
> > vala-list mailing list
> > vala-list gnome org
> > http://mail.gnome.org/mailman/**listinfo/vala-list<http://mail.gnome.org/mailman/listinfo/vala-list>
>
> Doesn't seem that you're doing anything wrong. Vala isn't generating the
> normal dup and free functions for your simple type struct. I'm going to
> check bugzilla if there's a bug about it. This should be removed from the
> tutorial considering it doesn't work.

It looks like that deriving from any primitive type is broken. You might be
able to trick Vala into making it work by defining the functions, but I
wouldn't do that. My suggestion is to not do this.