Asynchronous Programming with Coroutines

The generator class implemented in the previous chapter helped us to use coroutines for building lazily evaluated sequences. C++ coroutines can also be used for asynchronous programming by having a coroutine represent an asynchronous computation or an asynchronous task. Although asynchronous programming is the most important driver for having coroutines in C++, there is no support for asynchronous tasks based on coroutines in the standard library. If you want to use coroutines for asynchronous programming, I recommend you find and use a library that complements C++20 coroutines. I've already recommended CppCoro (https://github.com/lewissbaker/cppcoro), which at the time of writing seems like the most promising alternative. It's also possible to use asynchronous coroutines with the well-established library Boost.Asio, as you will see later on in this chapter.

This chapter will show that asynchronous programming is possible using...