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Note that std::future references shared state that is not shared with any other asynchronous return objects (as opposed to std::shared_future).

The code above might look ugly, but all you have to understand is that the FutureBuilder widget takes two arguments: future and builder, future is just the future you want to use, while builder is a function that takes two parameters and returns a widget. FutureBuilder will run this function before and after the future completes.

A std::future 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 ...

A future statement is a directive to the compiler that a particular module should be compiled using syntax or semantics that will be available in a specified future release of Python. The future statement is intended to ease migration to future versions of Python that introduce incompatible changes to the language. It allows use of the new features on a per-module basis before the release in ...

What is future in Python used for and how/when to use it, and how ...

future (const future &) = delete; ~future (); future & operator =(const future &) = delete; future & operator =(future &&) noexcept; shared_future share () noexcept; // retrieving the value /* see description */ get (); // functions to check state bool valid () const noexcept; void wait () const; template