和迭代器不同，不需要先移动指针（使用 next()）来进入合法的状态。

Unlike an iterator, the cursor need not be advanced first (using next()) in order to get into a valid state.

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本文给出一种特殊的自指针先入先出（FIFO）电路的设计。

A special Self-Pointer FIFO is designed with very simple architecture and the scheme removes the overhead address-pointer counting.

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