Hi Thiago, what is the relevance of the inheritance from QObject for QPointer?   -----Ursprüngliche Nachricht----- Von:Thiago Macieira via Std-Proposals <std-proposals_at_[hidden]> Gesendet:Mo 24.02.2025 15:22 Betreff:Re: [std-proposals] A non-owning but self zeroing smart pointer for single ownership An:std-proposals_at_[hidden]; CC:Thiago Macieira <thiago_at_[hidden]>; On Monday, 24 February 2025 03:26:32 Brasilia Standard Time Robin Savonen Söderholm via Std-Proposals wrote: > But I am not sure if we are getting any advantage over shared_ptr. I've been wondering the same: under what conditions would the proposed class here be used instead of shared_ptr and weak_ptr? The class proposed here looks like Qt's QPointer (which has been mentioned), but that has some important differences: * it requires the pointed object to derive from QObject * it reports deletion thread-safely, but it doesn't guarantee the object won't  get deleted on the next instance QPointer is implemented using *the exact same* mechanism as QWeakReference and QSharedPointer, except you can't "lock" the object into a QSharedPointer (you can't prevent destruction). So if this proposed class were also implemented using the same ref-counted ref-counter structure block, it would be even more reason to ask why not use std::shared_pointer in the first place. -- Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org  Principal Engineer - Intel DCAI Platform & System Engineering -- Std-Proposals mailing list Std-Proposals_at_[hidden] https://lists.isocpp.org/mailman/listinfo.cgi/std-proposals