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/* GObject - GLib Type, Object, Parameter and Signal Library
* Copyright (C) 2006 Imendio AB
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <glib-object.h>
/* --- MySingleton class --- */
struct _MySingleton {
GObject parent_instance;
int myint;
};
#define MY_TYPE_SINGLETON my_singleton_get_type ()
G_DECLARE_FINAL_TYPE (MySingleton, my_singleton, MY, SINGLETON, GObject)
G_DEFINE_FINAL_TYPE (MySingleton, my_singleton, G_TYPE_OBJECT)
static MySingleton *the_one_and_only = NULL;
/* --- methods --- */
static GObject*
my_singleton_constructor (GType type,
guint n_construct_properties,
GObjectConstructParam *construct_properties)
{
if (the_one_and_only)
return g_object_ref (G_OBJECT (the_one_and_only));
else
return G_OBJECT_CLASS (my_singleton_parent_class)->constructor (type, n_construct_properties, construct_properties);
}
static void
my_singleton_finalize (GObject *object)
{
g_assert ((GObject *) the_one_and_only == object);
the_one_and_only = NULL;
G_OBJECT_CLASS (my_singleton_parent_class)->finalize (object);
}
static void
my_singleton_init (MySingleton *self)
{
g_assert_null (the_one_and_only);
the_one_and_only = self;
}
static void
my_singleton_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
MySingleton *self = (MySingleton *) gobject;
g_assert (prop_id == 1);
self->myint = g_value_get_int (value);
}
static void
my_singleton_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MySingleton *self = (MySingleton *) gobject;
g_assert (prop_id == 1);
g_value_set_int (value, self->myint);
}
static void
my_singleton_class_init (MySingletonClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructor = my_singleton_constructor;
object_class->finalize = my_singleton_finalize;
object_class->set_property = my_singleton_set_property;
object_class->get_property = my_singleton_get_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), 1,
g_param_spec_int ("foo", NULL, NULL,
0, G_MAXINT, 0,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
}
static void
test_singleton_construction (void)
{
MySingleton *singleton, *obj;
/* create the singleton */
singleton = g_object_new (MY_TYPE_SINGLETON, NULL);
g_assert_nonnull (singleton);
/* assert _singleton_ creation */
obj = g_object_new (MY_TYPE_SINGLETON, NULL);
g_assert_true (singleton == obj);
g_object_unref (obj);
/* shutdown */
g_object_unref (singleton);
}
static void
test_singleton_construct_property (void)
{
MySingleton *singleton;
g_test_summary ("Test that creating a singleton with a construct-time property works");
g_test_bug ("https://gitlab.gnome.org/GNOME/glib/-/issues/2666");
/* create the singleton and set a property at construction time */
singleton = g_object_new (MY_TYPE_SINGLETON, "foo", 1, NULL);
g_assert_nonnull (singleton);
/* shutdown */
g_object_unref (singleton);
}
int
main (int argc,
char *argv[])
{
g_test_init (&argc, &argv, NULL);
g_test_add_func ("/gobject/singleton/construction", test_singleton_construction);
g_test_add_func ("/gobject/singleton/construct-property", test_singleton_construct_property);
return g_test_run ();
}
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