Introduction to Coroutines

Explore the concept of coroutines introduced in C++20 and understand how co_await and co_yield extend function execution to support asynchronous programming and lazy evaluation. Learn to implement generator functions that produce data streams efficiently without blocking program execution.

We'll cover the following...

- - A Generator Function

Coroutines are functions that can suspend and resume their execution while keeping their state. The evolution of functions goes one step further in C++20.

What I present in this section as a new idea in C++20 is actually quite old. The term coroutine was coined by Melvin Conway; He used it in his publication on compiler construction in 1963. Likewise, Donald Knuth called procedures a special case of coroutines. Sometimes, it just takes a while to get your ideas accepted.

With the new keywords co_await and co_yield, C++20 will extend the execution of a C++ function with two new concepts.

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1.Introduction

2.A Quick Overview

3.Memory Model: The Contract

4.Memory Model: Atomics

5.Memory Model: Synchronization and Ordering Constraints

6.Memory Model: Fences

7.Multithreading: Threads

8.Multithreading: Shared Data

9.Multithreading: Local Data

10.Multithreading: Condition Variables

11.Multithreading: Tasks

12.Case Study: Calculate Sum of a Vector

13.Case Study: Thread-Safe Initialization of a Singleton

14.Case Study: Ongoing Optimization with CppMem

15.Parallel Algorithms of the Standard Template Library

16.The Future: C++20

17.Coding Examples

18.Best Practices

19.The Time Library

20.Glossary

21.About the Author

Introduction to Coroutines