They're RAII/smart pointer-like classes. QUIP-0019 says such classes' ctors should be marked [[nodiscard]]. Task-number: QTBUG-104164 Change-Id: I830badfa56fbdfb5819866f67b84cd4fa93acbde Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io> (cherry picked from commit 83a156cd1139950dd333b3151d16a86ce19b06d2) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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