What are some examples of using async in C++14?

Can you give me some examples of using async in C++14?

Sure! In C++14, you can use the std::async function to run tasks asynchronously. For example, you can launch a task like this:

#include <future>
#include <iostream>

int compute(int x) {
    return x * x;
}

int main() {
    auto future = std::async(std::launch::async, compute, 10);
    std::cout << "Result: " << future.get() << std::endl;
}

What does std::launch::async do?

std::launch::async ensures that the task is run on a new thread. It guarantees that the function will execute asynchronously.

Can I use std::async without std::launch::async?

Yes, you can omit it, and std::async will choose the launch policy automatically, which may run the task either asynchronously or synchronously.

Are there any limitations to using std::async?

Yes, one limitation is that if the task takes too long, it may block the main thread when calling future.get(), waiting for the result.