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gobject: new g_set_weak_pointer() & g_clear_weak_pointer() helpers

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Weak-pointers are currently lacking g_set_object() & g_clear_object()
helpers equivalent. New functions (and macros, both are provided) are
convenient in many case, especially for the property's notify-on-set
pattern:

  if (g_set_weak_pointer (...))
    g_object_notify (...)

Inspired by Christian Hergert's original implementation for
gnome-builder.

https://bugzilla.gnome.org/show_bug.cgi?id=749527
This commit is contained in:
Martin Blanchard
2017-12-20 23:05:53 +01:00
committed by Philip Withnall
parent 62c4768423
commit 156d32cb80
3 changed files with 210 additions and 0 deletions
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106
gobject/tests/reference.c
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@@ -313,6 +313,108 @@ test_weak_pointer (void)
g_assert (weak2 == obj);
}
static void
test_weak_pointer_clear (void)
{
GObject *obj;
gpointer weak = NULL;
g_clear_weak_pointer (&weak);
g_assert_null (weak);
weak = obj = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (obj->ref_count, ==, 1);
g_object_add_weak_pointer (obj, &weak);
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_true (weak == obj);
g_clear_weak_pointer (&weak);
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_null (weak);
g_object_unref (obj);
}
static void
test_weak_pointer_clear_function (void)
{
GObject *obj;
gpointer weak = NULL;
(g_clear_weak_pointer) (&weak);
g_assert_null (weak);
weak = obj = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (obj->ref_count, ==, 1);
g_object_add_weak_pointer (obj, &weak);
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_true (weak == obj);
(g_clear_weak_pointer) (&weak);
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_null (weak);
g_object_unref (obj);
}
static void
test_weak_pointer_set (void)
{
GObject *obj;
gpointer weak = NULL;
g_assert_false (g_set_weak_pointer (&weak, NULL));
g_assert_null (weak);
obj = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_true (g_set_weak_pointer (&weak, obj));
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_true (weak == obj);
g_assert_true (g_set_weak_pointer (&weak, NULL));
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_null (weak);
g_assert_true (g_set_weak_pointer (&weak, obj));
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_true (weak == obj);
g_object_unref (obj);
g_assert_null (weak);
}
static void
test_weak_pointer_set_function (void)
{
GObject *obj;
gpointer weak = NULL;
g_assert_false ((g_set_weak_pointer) (&weak, NULL));
g_assert_null (weak);
obj = g_object_new (G_TYPE_OBJECT, NULL);
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_true ((g_set_weak_pointer) (&weak, obj));
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_true (weak == obj);
g_assert_true ((g_set_weak_pointer) (&weak, NULL));
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_null (weak);
g_assert_true ((g_set_weak_pointer) (&weak, obj));
g_assert_cmpint (obj->ref_count, ==, 1);
g_assert_true (weak == obj);
g_object_unref (obj);
g_assert_null (weak);
}
/* See gobject/tests/threadtests.c for the threaded version */
static void
test_weak_ref (void)
@@ -667,6 +769,10 @@ main (int argc, char **argv)
g_test_add_func ("/object/value", test_object_value);
g_test_add_func ("/object/initially-unowned", test_initially_unowned);
g_test_add_func ("/object/weak-pointer", test_weak_pointer);
g_test_add_func ("/object/weak-pointer/clear", test_weak_pointer_clear);
g_test_add_func ("/object/weak-pointer/clear-function", test_weak_pointer_clear_function);
g_test_add_func ("/object/weak-pointer/set", test_weak_pointer_set);
g_test_add_func ("/object/weak-pointer/set-function", test_weak_pointer_set_function);
g_test_add_func ("/object/weak-ref", test_weak_ref);
g_test_add_func ("/object/toggle-ref", test_toggle_ref);
g_test_add_func ("/object/qdata", test_object_qdata);