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rust-lang/futures-rs#2412 中引入的修改使得
futures::future::join_all
在遇到大量或不定数量的Future
时使用FutureOrdered
实现,避免了全量poll
带来的开销。考虑到join
系列函数并不能动态插入Future
来poll
,这里依然保留了FuturesOrdered
/FuturesUnordered
的介绍,并略微修改了一下说明。