can reuse the array when ((union alloc_header *)data)[-1].ref is zero.
前苹果首席设计师乔纳森 · 艾维：创造美的事物
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For horizontal movement we can do even better. If your snake is moving to the right, we start by deleting every character on the left edge of the screen and inserting a new one on the right edge. After that, we do our patching (if needed). This automatically moves fruit into the correct position without us even needing to reprint it!
Vishnevskiy said this system "does not read your messages, analyse your conversations, or look at the content you post" in order to determine your age.