C++ Coroutines

A coroutine in C++ is an finite state machine that can be controlled and customized by the promise_type.

Promise Type

A promise type is used to coordinate with coroutines. Unlike the return type, it resides in the coroutine frame and are usually accessed through a pointer (which can be returned by .promise() of a coroutine handle)

Insights

• compare C++ coroutines and async Rust
• why C++ coroutines allocate on the heap

Resources

• Introduction to C++ Coroutines Through a Thread Scheduling Demonstration
• Deciphering C++ Coroutines - A Diagrammatic Coroutine Cheat Sheet - Andreas Weis - CppCon 2022
• C++ Coroutine Intuition - Roi Barkan - CppNow 2023
• C++ Coroutines from Scratch by Andreas Fertig
• Coroutines C++ vs Rust
• Adventures in Thread-per-Core Async with Redpanda and Seastar by Travis Downs