Just as developers do not worry about the overhead of a virtual method dispatch, they will not worry about the invocation overhead of advice.
就像开发人员不该担心虚拟方法分派的开销一样，他们也不用担心通知的调用开销。
Does Swift have dynamic dispatch and virtual methods?
快速动态调度和虚拟的方法吗？
Does Swift have dynamic dispatch and virtual methods?
快速动态调度和虚拟的方法吗？
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