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For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
，这一点在同城约会中也有详细论述
for (const auto &seg : segments) {，更多细节参见夫子
4 A good discussion on luminance and how to calculate it can be found on this stack exchange question. ↑，更多细节参见heLLoword翻译官方下载
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