Introduction to coroutines

C++20 introduced coroutines, a powerful new paradigm for structuring code. However the design and usage can be a bit obtuse when first approaching it.

High level ideas like "run code asynchronously" and "execute code whilst you wait for I/O" are often touted as advantages of coroutines, but:

• "If I'm waiting for I/O what code can get executed?"
• "How do I get resumed once I/O is done?"
• "How does this work with threads?"

Are often follow up questions, which lead to more confusion.

This workshop provides a practical approach to learning coroutines. We will go through a series of worked examples, including:

• My first coroutine
• Generators
• Async TCP server
• Coroutine based job scheduler

Each example provides an opportunity to write out, run and experiment with coroutine code. As well as to ask questions and understand the machinery behind coroutines.