UE5 C++ Blueprint Specifications Reference *Generated by GPT - accuracy not verified*

Core Blueprint Exposure Macros

These macros and annotations are used to expose functions, variables, and classes to Blueprints:

• UCLASS(): Used to declare a class as a UObject-derived class for UE5.
• UFUNCTION(): Declares a function to be exposed to Blueprints.
• UPROPERTY(): Declares a variable to be exposed to Blueprints.
• USTRUCT(): Declares a struct that can be exposed to Blueprints.
• UENUM(): Declares an enum for Blueprint exposure.
• UINTERFACE(): Declares an interface for Blueprint exposure.

Function Specifiers

Specifiers for UFUNCTION() macros to control Blueprint behavior:

• BlueprintAuthorityOnly: Function can only be executed on the server.
• BlueprintCosmetic: Function can only be executed on clients.
• BlueprintImplementableEvent: Declares a function that is implemented in Blueprints.
• BlueprintNativeEvent: Declares a function with both C++ and Blueprint implementations.
• Server, Client, NetMulticast: Specifies network replication behavior.
• Reliable, Unreliable: Defines the reliability of replicated functions.

Variable Specifiers

Specifiers for UPROPERTY() macros:

• EditAnywhere: Allows the property to be editable in the editor and sub-objects.
• EditDefaultsOnly: Property is editable only on default objects.
• EditInstanceOnly: Property is editable only on instances.
• VisibleAnywhere: Read-only in all contexts but visible in the editor.
• VisibleDefaultsOnly: Read-only and visible only on default objects.
• Transient: The property is not saved to disk.
• Replicated, ReplicatedUsing: Marks a variable for network replication.
• Config: Variable is serialized to configuration files.

Class Specifiers

Used in UCLASS() macros:

• BlueprintType: Makes the class usable as a type in Blueprints.
• Blueprintable: Allows the class to be subclassed in Blueprints.
• NotBlueprintable: Prevents the class from being subclassed in Blueprints.
• Abstract: Prevents instantiation of the class directly.
• MinimalAPI: Exposes only minimal APIs for the class to other modules.
• Config: Indicates that the class has associated configuration properties.

Reserved Keywords for Networking

For networked gameplay:

• Net: Marks a variable for replication.
• ReplicatedUsing: Specifies a function to be called when a variable is replicated.
• NetMulticast: Marks a function to be called on all clients.
• Server: Marks a function to run only on the server.
• Client: Marks a function to run only on the client.

Important Metadata Specifiers

You can add metadata to macros for more control:

• DisplayName: Specifies the display name in Blueprints.
• ToolTip: Adds a tooltip for the function or variable.
• DefaultToSelf: Sets a default value of self for a function parameter.
• AdvancedDisplay: Marks parameters or variables as advanced, hiding them by default.
• BlueprintInternalUseOnly: Hides the function from normal Blueprint usage.

Reserved Words

UE5 reserves certain words for internal use; avoid using them as identifiers:

• Default
• None
• Self
• Root
• Transient
• Config
• Editor
• World
• GameInstance
• Actor
• Component
• Pawn
• Controller