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Unreal Engine C++ API Reference > Runtime > MovieScene > Evaluation > FPersistentEvaluationData
Syntax
mutable FMovieSceneEvaluationKey TrackKey
Remarks
The keys themselves are mutable since this a proxy representation of the data above. For a const FPersistentEvaluationData& we can change the ptr to the persistent data, but we can't change the data itself (as with a const T*)