// so.c
// gcc -Wall `pkg-config --libs --cflags glib-2.0 gobject-2.0` -o so so.c
#include <glib-object.h>

/* prototypes */
#define SIMPLE_OBJECT_TYPE (simple_object_get_type ())
#define SIMPLE_OBJECT (obj)  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
			      SIMPLE_OBJECT_TYPE, 		 \
			      SimpleObject))

GType simple_object_get_type ();

typedef struct _SimpleObject SimpleObject;
typedef struct _SimpleObjectClass SimpleObjectClass;
typedef struct _SimpleObjectPrivate SimpleObjectPrivate;


struct _SimpleObject {
	GObject              parent;

	SimpleObjectPrivate *priv;
};


struct _SimpleObjectClass {
	GObjectClass parent_class;
};


/* ************* normally in a c file ************************ **/

struct _SimpleObjectPrivate {

	int some_private_var;
};

G_DEFINE_TYPE (SimpleObject, 
	       simple_object, 
	       G_TYPE_OBJECT);

static void
simple_object_class_init (SimpleObjectClass *klass)
{
	GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
	SimpleObjectClass *so_class;

	g_type_class_add_private (klass, sizeof (SimpleObjectPrivate));
}

static void
simple_object_init (SimpleObject *so)
{
	so->priv = G_TYPE_INSTANCE_GET_PRIVATE (so, 
						SIMPLE_OBJECT_TYPE,
						SimpleObjectPrivate);
}

//NOTE: normally we would do properties for that

void
simple_object_set_foo (SimpleObject *so, int foo)
{
	SimpleObjectPrivate *priv;

	priv = so->priv;
	priv->some_private_var = foo;
}


int
simple_object_get_foo (SimpleObject *so)
{
	SimpleObjectPrivate *priv;

	priv = so->priv;

	return priv->some_private_var;
}


int
main (int argc, char **argv)
{
	SimpleObject *obj;
	g_type_init ();

	obj = g_object_new (SIMPLE_OBJECT_TYPE, NULL);
	
	//do something with it

	simple_object_set_foo (obj, 42);

	g_print ("Foo: %d\n", simple_object_get_foo (obj));

	g_object_unref (obj);

	return 0;
}