Unreal Engine 4 Scripting with C++ Cookbook

Inheriting UInterface from one another

Sometimes, you may need to create a UInterface that specializes on a more general UInterface.

This recipe shows you how to use inheritance with UInterfaces to specialize a Killable interface with an Undead interface that cannot be killed by normal means.

How to do it...

1. Create a UINTERFACE/IInterface called UKillable.
2. Add UINTERFACE(meta=(CannotImplementInterfaceInBlueprint)) to the UInterface declaration.
3. Add the following functions to the header file:

   UFUNCTION(BlueprintCallable, Category=Killable)
   virtual bool IsDead();
   UFUNCTION(BlueprintCallable, Category = Killable)
   virtual void Die();

4. Provide default implementations for the interface inside the implementation file:

   boolIKillable::IsDead() { return false; ...