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Niels Lohmann
2913e96433
* Unflatten in time and memory linear in the pointer depth #5443 made unflatten() decide between arrays and objects independently of the iteration order by collecting the pointer prefixes that have a reference token 0 below them in a std::set<std::vector<string_t>>. Every such prefix was stored as a copy of all its reference tokens, and get_and_create() compared whole prefix vectors at every step, so unflattening a pointer of depth d took time and memory quadratic in d: a 10,000-level array pointer took 18 s and 1.3 GB, a 100,000-level one did not finish. The prefixes are now numbered nodes of a tree, so each is stored once and get_and_create() follows the tree token by token. The result is unchanged, including its independence of the iteration order. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Initialize prefix_tree members to satisfy -Weffc++ Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Move prefix_tree setup and child insertion into member functions The constructor now creates the root node, add_child() inserts a reference token below a prefix and returns the child's number, and find_child() looks one up for get_and_create(). Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>