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A Blueprint Interface is similar to an interface in general programming. It allows different types of object to share a common information setup. It is a collection of one or more functions (declarations only, no implementations) that can be added to other Blueprints. A Blueprint Interface needs to be added to a Blueprint class in order to work, and a Blueprint class that has implemented an interface can have and use all of its function

From

Cover of Unreal Engine Game Development Blueprints

Note

蓝图接口