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> Unreal Engine API Reference > Runtime > Engine > Subsystems > USubsystem

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USubsystem

Subsystems are auto instanced classes that share the lifetime of certain engine constructs

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Inheritance Hierarchy

UObjectBase

UObjectBaseUtility

UObject

USubsystem

UDynamicSubsystem

UGameInstanceSubsystem

	UCommonUISubsystemBase
	UGameFrameworkComponentManager
	UReplaySubsystem

ULocalPlayerSubsystem

	UCommonInputSubsystem
	UCommonUIActionRouterBase
	UEnhancedInputLocalPlayerSubsystem

UWorldSubsystem

UColorCorrectRegionsSubsystem

UConversationRegistry

UDisplayClusterWorldSubsystem

UGPULightmassSubsystem

UNetworkPhysicsManager

UNetworkPredictionWorldManager

UObjectTraceWorldSubsystem

UTickableWorldSubsystem

	UAutoDestroySubsystem
	ULandscapeSubsystem
	UQuartzSubsystem
	UWaterSubsystem

UViewportStatsSubsystem

References

Module	Engine
Header	/Engine/Source/Runtime/Engine/Public/Subsystems/Subsystem.h
Include	#include "Subsystems/Subsystem.h"

Syntax

class USubsystem : public UObject

Remarks

Subsystems are auto instanced classes that share the lifetime of certain engine constructs

Currently supported Subsystem lifetimes are: Engine -> inherit UEngineSubsystem Editor -> inherit UEditorSubsystem GameInstance -> inherit UGameInstanceSubsystem World -> inherit UWorldSubsystem LocalPlayer -> inherit ULocalPlayerSubsystem

Normal Example: class UMySystem : public UGameInstanceSubsystem Which can be accessed by: UGameInstance* GameInstance = ...; UMySystem* MySystem = GameInstance->GetSubsystem<UMySystem>();

or the following if you need protection from a null GameInstance UGameInstance* GameInstance = ...; UMyGameSubsystem* MySubsystem = UGameInstance::GetSubsystem<MyGameSubsystem>(GameInstance);

You can get also define interfaces that can have multiple implementations. Interface Example : MySystemInterface With 2 concrete derivative classes: MyA : public MySystemInterface MyB : public MySystemInterface

Which can be accessed by: UGameInstance* GameInstance = ...; const TArray<UMyGameSubsystem*>& MySubsystems = GameInstance->GetSubsystemArray<MyGameSubsystem>();

Constructors

	Name	Description
	USubsystem()

Functions

	Name	Description
void	Deinitialize()	Implement this for deinitialization of instances of the system
void	Initialize ( FSubsystemCollectionBase& Collecti... )	Implement this for initialization of instances of the system
bool	ShouldCreateSubsystem ( UObject* Outer )	Override to control if the Subsystem should be created at all.

Overridden from UObject

		Name	Description
	int32	GetFunctionCallspace ( UFunction* Function, FFrame* Stack )	Overridden to check global network context

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