Core types & containers

Unreal ships its own containers, string types, and math types. Use them, not std::: they integrate with UObject reflection, serialization, allocators, and garbage collection. Mixing in std::string or std::vector causes friction and these types won't serialize or reflect correctly.

When to use this skill

• Storing collections: choose TArray/TMap/TSet over std::vector/std::map/std::set.
• String work: pick FString (mutable), FName (identifier), or FText (user-facing / localized).
• 3D math: FVector, FRotator, FQuat, FTransform, and FMath helpers.
• Reaching for std::optional, std::variant, or std::tuple: use TOptional, TVariant, TTuple.
• Thread-safe producer/consumer: TQueue over a locked TArray.

Containers at a glance