Introduction to std::packaged_task
Explore how to use std::packaged_task to wrap callable objects for asynchronous execution in C++. Learn the four key steps: wrapping work, creating futures, performing calculations, and retrieving results. Understand how to use futures to collect asynchronous task outcomes in multithreaded programs.
We'll cover the following...
std::packaged_task pack is a wrapper for a callable in order for it to be invoked asynchronously. By calling pack.get_future() you 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 your work:
II. Create a future:
III. Perform the calculation:
IV. Query the result:
Here is an example showing the four ...