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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outdated and difficult to reason about.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
Games/Minesweeper/main.cpp
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@ -24,7 +24,7 @@ int main(int argc, char** argv)
widget->set_layout(make<GBoxLayout>(Orientation::Vertical));
widget->layout()->set_spacing(0);
auto container = GWidget::construct(widget);
auto container = GWidget::construct(widget.ptr());
container->set_fill_with_background_color(true);
container->set_size_policy(SizePolicy::Fill, SizePolicy::Fixed);
container->set_preferred_size(0, 36);