C++ Coroutines from scratch
summary
Starts from plain functions and implements working coroutines: a chat generator with promise methods yield_value/return_value and await_transform, an interleave generator turned into a proper range by adding a custom iterator, and a simple cooperative scheduler that stores void handles in a std::list and resumes tasks round robin. Code uses std::coroutine_handle and suspend_always/suspend_never, shows heap allocation of the coroutine frame, and demonstrates that generators, range-based for iteration and a scheduler all compile and run as expected.
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chapters (14)
- 0:00Introduction to C++ coroutines
- 2:39Functions vs coroutines control flow
- 6:11What are coroutines
- 11:33Coroutine elements in C++
- 15:45Code simplicity note
- 16:32First coroutine chat example
- 27:41Coroutine handle and promise type
- 34:22Tasks and generators defined
- 35:28Interleaving vectors with coroutines
- 43:45Range-based for loop support
- 47:18Scheduling multiple tasks
- 53:22Global scheduler and co_await
- 56:38Summary and next steps
- 58:12Q&A on stack and memory
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