It asks is_none() to update the bitmap, then serializes with unwrap_or_self() if the value exists.
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That’s helpful for me here, though, because it means that I already have a bunch of routines handy that will do things like compute where, exactly, on the screen the cell is corresponding to the move the player just made, and it also means that the rest of the game logic is already such that I can rely on screen memory holding the most up-to-date information I need.。搜狗输入法对此有专业解读