gobject/tests/object.c

   1 #include <glib-object.h>
   2
   3 /* --------------------------------- */
   4 /* test_object_constructor_singleton */
   5
   6 typedef GObject MySingletonObject;
   7 typedef GObjectClass MySingletonObjectClass;
   8
   9 GType my_singleton_object_get_type (void);
  10
  11 G_DEFINE_TYPE (MySingletonObject, my_singleton_object, G_TYPE_OBJECT)
  12
  13 static MySingletonObject *singleton;
  14
  15 static void
  16 my_singleton_object_init (MySingletonObject *obj)
  17 {
  18 }
  19
  20 static GObject *
  21 my_singleton_object_constructor (GType                  type,
  22                                  guint                  n_construct_properties,
  23                                  GObjectConstructParam *construct_params)
  24 {
  25   GObject *object;
  26
  27   if (singleton)
  28     return g_object_ref (singleton);
  29
  30   object = G_OBJECT_CLASS (my_singleton_object_parent_class)->
  31     constructor (type, n_construct_properties, construct_params);
  32   singleton = (MySingletonObject *)object;
  33
  34   return object;
  35 }
  36
  37 static void
  38 my_singleton_object_finalize (MySingletonObject *obj)
  39 {
  40   singleton = NULL;
  41
  42   G_OBJECT_CLASS (my_singleton_object_parent_class)->finalize (obj);
  43 }
  44
  45 static void
  46 my_singleton_object_class_init (MySingletonObjectClass *klass)
  47 {
  48   GObjectClass *object_class = G_OBJECT_CLASS (klass);
  49
  50   object_class->constructor = my_singleton_object_constructor;
  51   object_class->finalize = my_singleton_object_finalize;
  52 }
  53
  54 static void
  55 test_object_constructor_singleton (void)
  56 {
  57   MySingletonObject *one, *two, *three;
  58
  59   one = g_object_new (my_singleton_object_get_type (), NULL);
  60   g_assert_cmpint (G_OBJECT (one)->ref_count, ==, 1);
  61
  62   two = g_object_new (my_singleton_object_get_type (), NULL);
  63   g_assert (one == two);
  64   g_assert_cmpint (G_OBJECT (two)->ref_count, ==, 2);
  65
  66   three = g_object_new (my_singleton_object_get_type (), NULL);
  67   g_assert (one == three);
  68   g_assert_cmpint (G_OBJECT (three)->ref_count, ==, 3);
  69
  70   g_object_add_weak_pointer (G_OBJECT (one), (gpointer *)&one);
  71
  72   g_object_unref (one);
  73   g_assert (one != NULL);
  74
  75   g_object_unref (three);
  76   g_object_unref (two);
  77
  78   g_assert (one == NULL);
  79 }
  80
  81 /* ----------------------------------- */
  82 /* test_object_constructor_infanticide */
  83
  84 typedef GObject MyInfanticideObject;
  85 typedef GObjectClass MyInfanticideObjectClass;
  86
  87 GType my_infanticide_object_get_type (void);
  88
  89 G_DEFINE_TYPE (MyInfanticideObject, my_infanticide_object, G_TYPE_OBJECT)
  90
  91 static void
  92 my_infanticide_object_init (MyInfanticideObject *obj)
  93 {
  94 }
  95
  96 static GObject *
  97 my_infanticide_object_constructor (GType                  type,
  98                                    guint                  n_construct_properties,
  99                                    GObjectConstructParam *construct_params)
 100 {
 101   GObject *object;
 102
 103   object = G_OBJECT_CLASS (my_infanticide_object_parent_class)->
 104     constructor (type, n_construct_properties, construct_params);
 105
 106   g_object_unref (object);
 107
 108   return NULL;
 109 }
 110
 111 static void
 112 my_infanticide_object_class_init (MyInfanticideObjectClass *klass)
 113 {
 114   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 115
 116   object_class->constructor = my_infanticide_object_constructor;
 117 }
 118
 119 static void
 120 test_object_constructor_infanticide (void)
 121 {
 122   GObject *obj;
 123   int i;
 124
 125 #ifndef G_ENABLE_DEBUG
 126   g_test_skip ("skip tests that rely on debug-only warnings");
 127   return;
 128 #endif
 129
 130   g_test_bug ("https://bugzilla.gnome.org/show_bug.cgi?id=661576");
 131
 132   for (i = 0; i < 1000; i++)
 133     {
 134       g_test_expect_message ("GLib-GObject", G_LOG_LEVEL_CRITICAL,
 135                              "*finalized while still in-construction*");
 136       g_test_expect_message ("GLib-GObject", G_LOG_LEVEL_CRITICAL,
 137                              "*Custom constructor*returned NULL*");
 138       obj = g_object_new (my_infanticide_object_get_type (), NULL);
 139       g_assert_null (obj);
 140       g_test_assert_expected_messages ();
 141     }
 142 }
 143
 144 /* --------------------------------- */
 145
 146 int
 147 main (int argc, char *argv[])
 148 {
 149   g_test_init (&argc, &argv, NULL);
 150
 151   g_test_add_func ("/object/constructor/singleton", test_object_constructor_singleton);
 152   g_test_add_func ("/object/constructor/infanticide", test_object_constructor_infanticide);
 153
 154   return g_test_run ();
 155 }