For consistency with the built-in operators, the postfix operators should return the old (unincremented or undecremented) value. That value is returned as a value, not a reference.
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- 为了与内置操作符一致,后缀式操作符应返回旧值(即,尚未自增或自减的值),并且,应作为值返回,而不是返回引用。