Example of creating new GObject class in Vala

main.c

/* main.c generated by valac 0.12.1, the Vala compiler
 * generated from main.vala, do not modify */


#include <glib.h>
#include <glib-object.h>
#include <stdlib.h>
#include <string.h>


#define TYPE_PROTOTYPE (prototype_get_type ())
#define PROTOTYPE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), TYPE_PROTOTYPE, Prototype))
#define PROTOTYPE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), TYPE_PROTOTYPE, PrototypeClass))
#define IS_PROTOTYPE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), TYPE_PROTOTYPE))
#define IS_PROTOTYPE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), TYPE_PROTOTYPE))
#define PROTOTYPE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), TYPE_PROTOTYPE, PrototypeClass))

typedef struct _Prototype Prototype;
typedef struct _PrototypeClass PrototypeClass;
#define _g_object_unref0(var) ((var == NULL) ? NULL : (var = (g_object_unref (var), NULL)))



void _vala_main (gchar** args, int args_length1);
Prototype* prototype_new (void);
Prototype* prototype_construct (GType object_type);
GType prototype_get_type (void) G_GNUC_CONST;


void _vala_main (gchar** args, int args_length1) {
	Prototype* _tmp0_ = NULL;
	Prototype* prototype;
	_tmp0_ = prototype_new ();
	prototype = _tmp0_;
	_g_object_unref0 (prototype);
}


int main (int argc, char ** argv) {
	g_type_init ();
	_vala_main (argv, argc);
	return 0;
}

main.vala

void main( string[] args ) {
  var prototype = new Prototype();
}

Makefile

#prototype: Prototype.vala main.vala
#	valac -C Prototype.vala main.vala

main: main.c Prototype.c
	gcc main.c Prototype.c -o main.bin `pkg-config glib-2.0 gtk+-2.0 --cflags --libs`

Prototype.c

/* Prototype.c generated by valac 0.12.1, the Vala compiler
 * generated from Prototype.vala, do not modify */


#include <glib.h>
#include <glib-object.h>


#define TYPE_PROTOTYPE (prototype_get_type ())
#define PROTOTYPE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), TYPE_PROTOTYPE, Prototype))
#define PROTOTYPE_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), TYPE_PROTOTYPE, PrototypeClass))
#define IS_PROTOTYPE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), TYPE_PROTOTYPE))
#define IS_PROTOTYPE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), TYPE_PROTOTYPE))
#define PROTOTYPE_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), TYPE_PROTOTYPE, PrototypeClass))

typedef struct _Prototype Prototype;
typedef struct _PrototypeClass PrototypeClass;
typedef struct _PrototypePrivate PrototypePrivate;

struct _Prototype {
	GObject parent_instance;
	PrototypePrivate * priv;
};

struct _PrototypeClass {
	GObjectClass parent_class;
};


static gpointer prototype_parent_class = NULL;

GType prototype_get_type (void) G_GNUC_CONST;
enum  {
	PROTOTYPE_DUMMY_PROPERTY
};
Prototype* prototype_new (void);
Prototype* prototype_construct (GType object_type);
static void prototype_finalize (GObject* obj);


Prototype* prototype_construct (GType object_type) {
  g_printf("\"%s\" function is called\n", __FUNCTION__);
	Prototype * self = NULL;
	self = (Prototype*) g_object_new (object_type, NULL);
	return self;
}


Prototype* prototype_new (void) {
  g_printf("\"%s\" function is called\n", __FUNCTION__);
	return prototype_construct (TYPE_PROTOTYPE);
}


static void prototype_class_init (PrototypeClass * klass) {
  g_printf("\"%s\" function is called\n", __FUNCTION__);
	prototype_parent_class = g_type_class_peek_parent (klass);
	G_OBJECT_CLASS (klass)->finalize = prototype_finalize;
}


static void prototype_instance_init (Prototype * self) {
  g_printf("\"%s\" function is called\n", __FUNCTION__);
}


static void prototype_finalize (GObject* obj) {
  g_printf("\"%s\" function is called\n", __FUNCTION__);
	Prototype * self;
	self = PROTOTYPE (obj);
	G_OBJECT_CLASS (prototype_parent_class)->finalize (obj);
}


GType prototype_get_type (void) {
  g_printf("\"%s\" function is called\n", __FUNCTION__);
	static volatile gsize prototype_type_id__volatile = 0;
	if (g_once_init_enter (&prototype_type_id__volatile)) {
		static const GTypeInfo g_define_type_info = { sizeof (PrototypeClass), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) prototype_class_init, (GClassFinalizeFunc) NULL, NULL, sizeof (Prototype), 0, (GInstanceInitFunc) prototype_instance_init, NULL };
		GType prototype_type_id;
		prototype_type_id = g_type_register_static (G_TYPE_OBJECT, "Prototype", &g_define_type_info, 0);
		g_once_init_leave (&prototype_type_id__volatile, prototype_type_id);
	}
	return prototype_type_id__volatile;
}

Prototype.vala

public class Prototype : Object {
  ~Prototype() {}
}