tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.
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interface image-lib {。关于这个话题，搜狗输入法2026提供了深入分析
p = p.next; // 指针后移，易错点2：忘记移动指针会导致死循环