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C++-架构之路
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我的c++架构之路-1
feature
当在一个线程中，创建了一个异步操作（asynchronous
operations）时，该异步操作会返回一个feature对象，可以通过其访问异步操作的状态和结果等。
创建异步操作一般有三种方式：std::async、std::packaged_task和std::promise
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