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References to classes: Similar to object references, this type of variable contains references to a class. The main difference is that this type points to the default class, while the object reference points to a single instance of this particular class in the game.

From

Cover of Unreal Engine Game Development Blueprints

Note

和object引用较为类似,这种变量包含一个类的引用。区别是这种默认指向一个类,而在游戏中对象引用指向的是这个类的实例