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LibCore: Make CObject reference-counted

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Okay, I've spent a whole day on this now, and it finally kinda works!
With this patch, CObject and all of its derived classes are reference
counted instead of tree-owned.

The previous, Qt-like model was nice and familiar, but ultimately also
outdated and difficult to reason about.

CObject-derived types should now be stored in RefPtr/NonnullRefPtr and
each class can be constructed using the forwarding construct() helper:

    auto widget = GWidget::construct(parent_widget);

Note that construct() simply forwards all arguments to an existing
constructor. It is inserted into each class by the C_OBJECT macro,
see CObject.h to understand how that works.

CObject::delete_later() disappears in this patch, as there is no longer
a single logical owner of a CObject.
This commit is contained in:
Andreas Kling 2019-09-22 00:17:53 +02:00
parent 0c72e0c09f
commit bc319d9e88
45 changed files with 174 additions and 233 deletions
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2
Libraries/LibThread/BackgroundAction.cpp
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@ -28,7 +28,7 @@ static int background_thread_func()
static void init()
{
s_all_actions = new LibThread::Lockable<Queue<Function<void()>>>();
s_background_thread = new LibThread::Thread(background_thread_func);
s_background_thread = &LibThread::Thread::construct(background_thread_func).leak_ref();
s_background_thread->set_name("Background thread");
s_background_thread->start();
}