std::experimental:: promise
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std::experimental::promise
可能指：
-
std::experimental::fundamentals_v1::promise或std::experimental::fundamentals_v2::promise，由 库基础技术规范 提供的改进版 std::promise ，支持类型擦除分配器； -
std::experimental::concurrency_v1::promise，由 并发技术规范 提供的改进版std::promise，其get_future()成员函数返回该技术规范提供的增强型 std::experimental::future 。