added test program which demonstrates and checks singleton construction.

Wed Aug 16 13:59:07 2006  Tim Janik  <timj@gtk.org>

        * tests/gobject/Makefile.am:
        * tests/gobject/singleton.c: added test program which demonstrates
        and checks singleton construction.

ChangeLog

@@ -1,3 +1,9 @@
+Wed Aug 16 13:59:07 2006  Tim Janik  <timj@gtk.org>
+
+	* tests/gobject/Makefile.am:
+	* tests/gobject/singleton.c: added test program which demonstrates
+	and checks singleton construction.
+
 2006-08-15  Matthias Clasen  <mclasen@redhat.com>
 
 	* glib/gbookmarkfile.c (g_bookmark_file_get_groups):

ChangeLog.pre-2-12

@@ -1,3 +1,9 @@
+Wed Aug 16 13:59:07 2006  Tim Janik  <timj@gtk.org>
+
+	* tests/gobject/Makefile.am:
+	* tests/gobject/singleton.c: added test program which demonstrates
+	and checks singleton construction.
+
 2006-08-15  Matthias Clasen  <mclasen@redhat.com>
 
 	* glib/gbookmarkfile.c (g_bookmark_file_get_groups):

tests/gobject/Makefile.am

@@ -56,6 +56,7 @@ test_programs =					\
 	ifaceinherit				\
 	ifaceproperties				\
 	override				\
+	singleton				\
 	references
 
 check_PROGRAMS = $(test_programs)

tests/gobject/singleton.c

@@ -0,0 +1,85 @@
+/* GObject - GLib Type, Object, Parameter and Signal Library
+ * Copyright (C) 2006 Imendio AB
+ *
+ * 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 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, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#undef  G_LOG_DOMAIN
+#define G_LOG_DOMAIN "TestSingleton"
+#include <glib-object.h>
+#include <string.h>
+
+/* --- MySingleton class --- */
+typedef struct {
+  GObject parent_instance;
+} MySingleton;
+typedef struct {
+  GObjectClass parent_class;
+} MySingletonClass;
+
+#define MY_TYPE_SINGLETON         (my_singleton_get_type ())
+#define MY_SINGLETON(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), MY_TYPE_SINGLETON, MySingleton))
+#define MY_IS_SINGLETON(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), MY_TYPE_SINGLETON))
+#define MY_SINGLETON_CLASS(c)     (G_TYPE_CHECK_CLASS_CAST ((c), MY_TYPE_SINGLETON, MySingletonClass))
+#define MY_IS_SINGLETON_CLASS(c)  (G_TYPE_CHECK_CLASS_TYPE ((c), MY_TYPE_SINGLETON))
+#define MY_SINGLETON_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), MY_TYPE_SINGLETON, MySingletonClass))
+
+G_DEFINE_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 (the_one_and_only);
+  else
+    return G_OBJECT_CLASS (my_singleton_parent_class)->constructor (type, n_construct_properties, construct_properties);
+}
+
+static void
+my_singleton_init (MySingleton *self)
+{
+  g_assert (the_one_and_only == NULL);
+  the_one_and_only = self;
+}
+
+static void
+my_singleton_class_init (MySingletonClass *klass)
+{
+  G_OBJECT_CLASS (klass)->constructor = my_singleton_constructor;
+}
+
+/* --- test program --- */
+int
+main (int   argc,
+      char *argv[])
+{
+  MySingleton *singleton, *obj;
+  g_type_init_with_debug_flags (G_TYPE_DEBUG_OBJECTS | G_TYPE_DEBUG_SIGNALS);
+  /* create the singleton */
+  singleton = g_object_new (MY_TYPE_SINGLETON, NULL);
+  g_assert (singleton != NULL);
+  /* assert _singleton_ creation */
+  obj = g_object_new (MY_TYPE_SINGLETON, NULL);
+  g_assert (singleton == obj);
+  g_object_unref (obj);
+  /* shutdown */
+  g_object_unref (singleton);
+  return 0;
+}