The Future and Promise pattern
In the asynchronous programming paradigm, a Future represents a value that is not yet known but will be provided eventually. When a function initiates an asynchronous operation, instead of blocking until the operation completes and a result is available, it immediately returns a Future. This Future object acts as a placeholder for the actual result available later.
Futures are commonly used for I/O operations, network requests, and other time-consuming tasks that run asynchronously. They allow the program to continue executing other tasks rather than waiting for the operation to be completed. That property is referred to as non-blocking.
Once the Future is fulfilled, the result can be accessed through the Future, often via callbacks, polling, or blocking until the result is available.
A Promise is the writable, controlling counterpart to a Future. It represents the producer side of the asynchronous operation, which will eventually provide a result...
