W dniu 14.08.2017 o 15:10, Borneq pisze:
> shared_ptr<Node> prev;

zamiana na weak_ptr<Node> prev;
skutkuje:
Constructor Node is called 0
Constructor Node is called 1
Constructor Node is called 2
Destructor Node is called 1
Constructor Node is called 3
Destructor Node is called 2
Constructor Node is called 4
Destructor Node is called 3
====
Destructor Node is called 0
Destructor Node is called 4

Żle bo wszystkie destructory powinny być wołane po kresce, za szybko
teraz zwalnia.
---
shared_ptr<Node> prev;
weak_ptr<Node> weakprev;

first->weakprev = node;

Teraz ok, czyli najgłębszy wskazujący ten na szczycie powinien być tylko
weak.