Today I've written a 10-page paper about preventing re-entry in C++.
Skip to Page 8 to see how the class can retain its movability and
copyability while using an allocator of your choosing.

I've attached the file "noreentry_draft01.pdf" to this email, and you
can also download the latest draft from here:

      http://www.virjacode.com/download/noreentry_latest_draft.pdf

Here's the web link to this post in the archive for the C++ standard
proposals mailing list:

      https://lists.isocpp.org/std-proposals/2023/02/5799.php