Unreal Engine C++: TMap doc sheet

UE TMap documentation, reference sheet, cheat sheet - 11/2022 - #Unreal

Cheat sheet to unreal's TMap and equivalence with std::map.

Basic

#include "Containers/Map.h"

	std::map<K, T>	TMap<K, T>
Insert a new unique element	map[key] = value	.Add(key, value)
Find by key	std::map::const_iterator it; it = map.find( key ); // Test if found: it != map.end();	T* value = map.Find(key) // Test if found: value != nullptr;
Find or add a default value. i.e. value == T() if key does not exists.	T& value = map[ key ];	T& value = map.FindOrAdd(key)
Number of elements	.size()	.Num()
Check (size == 0) / (Num == 0)	.empty()	.IsEmpty()
Set number of elements to 0	.clear()	.Empty() // Keep allocated memory .Reset()
Pre-allocate memory	None	.Reserve(int size)

	std::map<K, T>	TMap<K, T>
Remove element which matches 'key'	.erase(key)	.Remove(key)

No comments