Introduction to std::packaged_task
Explore how to use std::packaged_task to wrap callables and execute them asynchronously in C++. Understand creating futures, running tasks in threads, and collecting results through a practical example that sums numbers across multiple threads.
We'll cover the following...
We'll cover the following...
std::packaged_task pack is a wrapper for a callable, which allows it to be invoked asynchronously. By calling pack.get_future(), we get the associated future. Invoking the call operator on pack (pack()) executes the std::packaged_task and, therefore, executes the callable.
Dealing with std::packaged_task usually consists of four steps:
I. Wrap our work:
II. Create a future:
III. Perform the calculation:
IV. Query the result:
Here is an example ...