In the meeting agenda, and in recent sg19 minutes, I noticed the mention of graph and tree data structures. Just wanted to point out a previous paper I helped with in the tree data structure space that might help inform possible designs of related data structures.

Hierarchical Data Structures and Related Concepts for the C++ Standard Library
<https://wg21.link/n3700>

--
-- Rene Rivera
-- Grafik - Don't Assume Anything
-- Robot Dreams - http://robot-dreams.net