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It is much easier to suggest solutions when you know nothing about the problem.

devel / comp.lang.c++ / "Phantom and indulgent shared pointers" by Raymond Chen

"Phantom and indulgent shared pointers" by Raymond Chen

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https://www.rocksolidbbs.com/devel/article-flat.php?id=1106&group=comp.lang.c%2B%2B#1106

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From: lynnmcguire5@gmail.com (Lynn McGuire)
Newsgroups: comp.lang.c++
Subject: "Phantom and indulgent shared pointers" by Raymond Chen
Date: Mon, 21 Aug 2023 15:18:44 -0500
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by: Lynn McGuire - Mon, 21 Aug 2023 20:18 UTC

"Phantom and indulgent shared pointers" by Raymond Chen
https://devblogs.microsoft.com/oldnewthing/20230818-00/

"Last time, we looked at various ways to convert among different
shared_ptrs. We finished with this diagram:"
Null control block Non-null control block
=================== ==================
Null stored pointer Empty Phantom
Non-null stored pointer Indulgent Full

"You are familiar with an empty shared pointer, which manages no object
and has no stored pointer. You are also familiar with a full shared
pointer, which manages an object and has a non-null stored pointer (to
the managed object, or something whose lifetime is controlled by the
managed object). But what about those other two guys?"

Lynn

Subject	Author
"Phantom and indulgent shared pointers" by Raymond Chen	Lynn McGuire