UObject

class CoreUObject Blueprint Since 1.0

Inherits: UObjectBase › UObjectBaseUtility › UObject

#include "UObject/Object.h"

Access: public Specifiers: UCLASS

Description

The base class of all Unreal Engine objects. UObject provides the foundation for the reflection system, garbage collection, serialization, and networking replication. Every UObject-derived instance is tracked by the garbage collector and must not be deleted manually with `delete`.

Signature

class UObject : public UObjectBaseUtility

Caveats & Gotchas

• Never delete a UObject manually. The garbage collector manages lifetime. Use `MarkAsGarbage()` to signal an object for collection.
• UObject instances cannot be created on the stack. Always use `NewObject<T>()` or `CreateDefaultSubobject<T>()`.
• UObject is not thread-safe by default. Access from game thread only unless using appropriate synchronization.
• Do not use raw pointers to UObjects across frames without ensuring the object is still valid (use `IsValid()`).

Example

Creating a UObject subclass C++

UCLASS()
class MYGAME_API UMyObject : public UObject
{
    GENERATED_BODY()

public:
    UPROPERTY(EditAnywhere, BlueprintReadWrite)
    FString MyData;

    void DoSomething();
};

// Creating an instance
UMyObject* Obj = NewObject<UMyObject>(this);
Obj->MyData = TEXT("Hello");

Functions (11)

Utility 10 Math 1

Utility

10 ▼

Access	Type	Name	Description
public	function	UObject::GetName	Returns the object's name without any path or package prefix as an FString, e.
public	function	UObject::GetClass	Returns the UClass that describes this object's type, fields, and metadata.
public	function	UClass::GetDefaultObject	Returns the Class Default Object (CDO) for this UClass — the shared archetype that holds default property values for all instances.
public	function	UObject::GetOuter	Returns the UObject that directly owns this object in the outer chain.
public	function	UObject::GetTypedOuter	Walks up the outer chain and returns the first object of type T, or null if none is found.
public	function	UObject::GetWorld	Returns the UWorld this object belongs to.
public	function	UObject::IsA	Returns true if this object's class is T or a subclass of T.
public	function	UObject::IsValid	Global helper function that returns true if the given UObject pointer is non-null and has not been marked for garbage collection.
public	function	UObject::MarkAsGarbage	Marks this UObject to be destroyed by the garbage collector on the next GC pass.
public	function	UObject::PostInitProperties	Called after all UPROPERTY fields have been initialized to their default values (from the CDO or inline initializers).

Math

1 ▼

Access	Type	Name	Description
public	function	UObject::Implements	Returns true if this object's class implements the specified UInterface.

Version History

Introduced in: 1.0

Version	Status	Notes
5.6	stable	—
5.5	stable	—
5.4	stable	—

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