USubsystem | Unreal Engine 5.6 Documentation

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();

or the following if you need protection from a null GameInstance UGameInstance* GameInstance = ...; UMyGameSubsystem* MySubsystem = UGameInstance::GetSubsystem(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& MySubsystems = GameInstance->GetSubsystemArray();


Name	USubsystem
Type	class
Header File	/Engine/Source/Runtime/Engine/Public/Subsystems/Subsystem.h
Include Path	#include "Subsystems/Subsystem.h"

Syntax

UCLASS (Abstract, MinimalAPI)  
class USubsystem : public UObject

Inheritance Hierarchy

UObjectBase → UObjectBaseUtility → UObject → USubsystem

Derived Classes

USubsystem derived class hierarchy

Constructors

Name	Remarks	Include Path	Unreal Specifiers
USubsystem()		Subsystems/Subsystem.h

Variables

Protected

Name	Type	Remarks	Include Path	Unreal Specifiers
InternalOwningSubsystem	FSubsystemCollectionBase *		Subsystems/Subsystem.h

Functions

Public

Name	Remarks	Include Path
virtual void Deinitialize()	Implement this for deinitialization of instances of the system	Subsystems/Subsystem.h
virtual void Initialize ( FSubsystemCollectionBase& Collection )	Implement this for initialization of instances of the system	Subsystems/Subsystem.h
virtual bool ShouldCreateSubsystem ( UObject* Outer ) const	Override to control if the Subsystem should be created at all.	Subsystems/Subsystem.h

Overridden from UObject

Name	Remarks	Include Path	Unreal Specifiers
virtual int32 GetFunctionCallspace ( UFunction* Function, FFrame* Stack )	Overridden to check global network context	Subsystems/Subsystem.h

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