Re: [hash2] Formal Review Begins

From: Vinnie Falco (vinnie.falco_at_[hidden])
Date: 2024-12-07 16:17:48

On Sat, Dec 7, 2024 at 7:27 AM Klemens Morgenstern via Boost <
boost_at_[hidden]> wrote:

> I wonder about the usefulness of pointers.
>

A use-case for pointers is:

    std::unordered_map< T*, std::weak_ptr<T> >

Where the T is constructed via std::make_shared. Note:

    If any std::weak_ptr references the control block created by
std::make_shared after the lifetime of all shared owners ended, the memory
occupied by T persists until all weak owners get destroyed as well, which
may be undesirable if sizeof(T) is large.

Thanks