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AK: Stop allowing implicit downcast with RefPtr and NonnullRefPtr

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We were allowing this dangerous kind of thing:

RefPtr<Base> base;
RefPtr<Derived> derived = base;

This patch changes the {Nonnull,}RefPtr constructors so this is no
longer possible.

To downcast one of these pointers, there is now static_ptr_cast<T>:

RefPtr<Derived> derived = static_ptr_cast<Derived>(base);

Fixing this exposed a ton of cowboy-downcasts in various places,
which we're now forced to fix. :^)
This commit is contained in:
Andreas Kling
2020-04-05 11:11:07 +02:00
parent 058c614110
commit 1d468ed6d3
11 changed files with 68 additions and 54 deletions
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4
Kernel/FileSystem/TmpFS.cpp
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@@ -307,8 +307,8 @@ KResult TmpFSInode::add_child(InodeIdentifier child_id, const StringView& name,
String owned_name = name;
FS::DirectoryEntry entry = { owned_name.characters(), owned_name.length(), child_id, 0 };
RefPtr<Inode> child_tmp = fs().get_inode(child_id);
NonnullRefPtr<TmpFSInode> child = static_cast<NonnullRefPtr<TmpFSInode>>(child_tmp.release_nonnull());
auto child_tmp = fs().get_inode(child_id);
auto child = static_ptr_cast<TmpFSInode>(child_tmp.release_nonnull());
m_children.set(owned_name, { entry, move(child) });
set_metadata_dirty(true);