例子 “一路move进去” “省了copy的开销” “rule of 7”

代码片段 and 分析

return std::thread(
    [func = std::move(func), name = std::move(name)]() mutable {
      folly::setThreadName(name);
      func();
    });

Executor Executor是一个接口，主要定义了Keepalive这个Subclass. 具体用法见UT：folly/folly/test/ExecutorTest.cpp.