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The class template std::future provides a mechanism to access the result of asynchronous operations When i'm managing some async An asynchronous operation (created via std::async, std::packaged_task, or std::promise) can provide a std::future object to the creator of that asynchronous operation

The creator of the asynchronous operation can then use a variety of methods to query, wait for, or extract a value from the std. Obviously, they have different methods and stuff, but what is the actual use case Checks if the future refers to a shared state

Returned by std::promise::get_future (), std::packaged_task::get_future () or std::async ()) until the first time get () or share () is called.

The get member function waits (by calling wait ()) until the shared state is ready, then retrieves the value stored in the shared state (if any) Right after calling this function, valid () is false. If the future is the result of a call to std::async that used lazy evaluation, this function returns immediately without waiting This function may block for longer than timeout_duration due to scheduling or resource contention delays

The standard recommends that a steady clock is used to measure the duration. Unlike std::future, which is only moveable (so only one instance can refer to any particular asynchronous result), std::shared_future is copyable and multiple shared future objects may refer to the same shared state Access to the same shared state from multiple threads is safe if each thread does it through its own copy of a shared_future object. A std::future<t> is a handle to a result of work which is [potentially] not, yet, computed

You can imagine it as the receipt you get when you ask for work and the receipt is used to get the result back

For example, you may bring a bike to bike store for repair You get a receipt to get back your bike While the work is in progress (the bike being repaired) you can go about other business. Unpin + future + ?sized, boxed futures only implement the future trait when the future inside the box implements unpin

Since your function doesn't guarantee that the returned future implements unpin, your return value will be considered to not implement future You'll not able to await it because your type is basically not a future. Wait_until waits for a result to become available It blocks until specified timeout_time has been reached or the result becomes available, whichever comes first

The return value indicates why wait_until returned

If the future is the result of a call to async that used lazy evaluation, this function returns immediately without waiting The behavior is undefined if valid () is false before. Specifies state of a future as returned by wait_for and wait_until functions of std::future and std::shared_future I'm confusing myself with difference between a std::future and a std::promise

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