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The class template std::future provides a mechanism to access the result of asynchronous operations 2) constructs a shared future that refers to the same. An asynchronous operation (created via std::async,.

Future.wait () for multiple futures asked 6 years, 7 months ago modified 5 years, 3 months ago viewed 82k times Constructs an empty shared future, that doesn't refer to a shared state, that is valid() == false In this case it does work

In general, it probably doesn't

I'm wondering how this break in backwards compatibility should in general be navigated 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. A future represents the result of an asynchronous operation, and can have two states

Most likely, as you aren't doing this just for fun, you actually. Checks if the future refers to a shared state 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.

The function template std::async runs the function f asynchronously (potentially in a separate thread which might be a part of a thread pool) and returns a std::future that will.

Constructs a std::future with the shared state of other using move semantics After construction, other.valid() == false.

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