Unreal Delegates

Offical Document

Declaring a Delegate

• DECLARE_DELEGATE(DelegateName)
• DECLARE_MULTICAST_DELEGATE(DelegateName)
• DECLARE_DYNAMIC_DELEGATE(DelegateName)
• DECLARE_DYNAMIC_MULTICAST_DELEGATE(DelegateName)

	Single	Multicast	Dynamic Single	Dynamic Multicast
How many can subscribe?	one	many	one	many
Can use from Blueprints?	X	X	O	O
Performance			slower than regular	slower than regular

Use UDELEGATE for Blueprint

UDELEGATE(BlueprintAuthorityOnly)
DECLARE_DYNAMIC_MULTICAST_DELEGATE(FInstigatedAnyDamageSignature);

Parameters & Return Value

Non Dynamic:

• DECLARE_DELEGATE_OneParam(DelegateName, Param1Type)
• DECLARE_DELEGATE_RetVal(DelegateName)
• DECLARE_DELEGATE_RetVal_OneParam(DelegateName, Param1Type) Dynamic:
• DECLARE_DYNAMIC_DELEGATE_OneParam(DelegateName, Param1Type, Param1Name)
• DECLARE_DYNAMIC_DELEGATE_RetVal(DelegateName)
• DECLARE_DYNAMIC_DELEGATE_RetVal_OneParam(DelegateName, Param1Type, Param1Name)
• DECLARE_MULTICAST_DELEGATE[_RetVal, ...]( DelegateName )
• DECLARE_DYNAMIC_MULTICAST_DELEGATE[_RetVal, ...]( DelegateName )

Subscribe to a Delegate

Single

• BindLambda
• BindRaw
• BindStatic
• BindSP
• BindUFUnction
• BindUObject
• BindWeakLambda
• BindThreadSafeSP

Multicast

• AddLambda
• AddRaw
• AddStatic
• AddSP
• AddUFunction
• AddUObject
• AddWeakLambda
• AddThreadSafeSP

Dynamic Single

• BindDynamic

Dynamic Multicast

• AddDynamic
• AddUniqueDynamic

Call the delegate

Single:

• Execute
• ExecuteIfBound Multicast:
• Broadcast