Unreal Engine 4.x Scripting with C++ Cookbook - Second Edition

Introduction

This chapter shows you how to write your own UInterfaces, and demonstrates how to take advantage of them within C++ to minimize class coupling and help keep your code clean.

In your game projects, you will sometimes require a series of potentially disparate objects to share a common functionality, but it would be inappropriate to use inheritance because there is no is-a relationship between the different objects in question. Languages such as C++ tend to use multiple inheritance to solve this issue.

However, in Unreal, if you wanted functions from both parent classes to be accessible to Blueprint, you would need to make both of them UCLASS. This is a problem for two reasons. Inheriting from UClass twice in the same object would ...