What are futures and promises in C++14?

Can you explain what futures and promises are in C++14?

Sure! Futures and promises are part of the C++14 standard library that help with asynchronous programming.

How do they work together?

A promise is a way to set a value that will be available in the future, while a future is a way to retrieve that value.

Can you give me a code example?

Absolutely! Here's a simple example:

#include <iostream>
#include <future>
#include <thread>

int main() {
    std::promise<int> prom;
    std::future<int> fut = prom.get_future();
    std::thread t([&prom]() {
        prom.set_value(10);
    });
    std::cout << "Value from future: " << fut.get() << std::endl;
    t.join();
    return 0;
}

What are some common use cases for futures and promises?

Common use cases include handling asynchronous tasks, managing concurrent operations, and improving performance in multi-threaded applications.