What are futures in the C++ Standard Library?

Can you explain what futures are in the C++ Standard Library?

Futures in C++ are a way to retrieve values from asynchronous operations. They represent a value that may not be available yet.

How do I create a future in C++?

You can create a future using std::async or std::promise. std::async runs a function asynchronously and returns a future.

What is the difference between future and promise?

A promise is used to set a value or an exception, while a future is used to retrieve that value or exception later.

Can futures be used with threads?

Yes, futures are often used with threads to manage asynchronous tasks and retrieve results once the tasks are complete.