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Add a new HashMap implementation

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Adds a new, cleaned up, HashMap implementation.

* Uses Robin Hood Hashing (https://en.wikipedia.org/wiki/Hash_table#Robin_Hood_hashing).
* Keeps elements in a double linked list for simpler, ordered, iteration.
* Allows keeping iterators for later use in removal (Unlike Map<>, it does not do much
  for performance vs keeping the key, but helps replace old code).
* Uses a more modern C++ iterator API, deprecates the old one.
* Supports custom allocator (in case there is a wish to use a paged one).

This class aims to unify all the associative template usage and replace it by this one:
* Map<> (whereas key order does not matter, which is 99% of cases)
* HashMap<>
* OrderedHashMap<>
* OAHashMap<>
This commit is contained in:
reduz 2022-05-08 10:09:19 +02:00 • committed by Rémi Verschelde
parent 9b7e16a6b8
commit 8b7c7f5a75
95 changed files with 1434 additions and 1874 deletions
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5
core/object/object.h
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@ -39,7 +39,6 @@
#include "core/templates/hash_map.h"
#include "core/templates/list.h"
#include "core/templates/map.h"
#include "core/templates/ordered_hash_map.h"
#include "core/templates/safe_refcount.h"
#include "core/templates/set.h"
#include "core/templates/vmap.h"
@ -515,8 +514,8 @@ private:
#endif
ScriptInstance *script_instance = nullptr;
Variant script; // Reference does not exist yet, store it in a Variant.
OrderedHashMap<StringName, Variant> metadata;
HashMap<StringName, OrderedHashMap<StringName, Variant>::Element> metadata_properties;
HashMap<StringName, Variant> metadata;
HashMap<StringName, Variant *> metadata_properties;
mutable StringName _class_name;
mutable const StringName *_class_ptr = nullptr;