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摘要： Hard Constraints on Resilience The root of a class hierarchy must remain stable, at pain of invalidating the metaclass hierarchy. Note that a Swift cl 阅读全文

摘要： Opaque:对使用者来说，类型结构和机制明晰即为transparent，否则为Opaque In computer science, an opaque data type is a data type whose concrete data structure is not defined in 阅读全文