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C++ Academy · Lesson

Coroutine Concepts co_await co_yield co_return

Learn the three coroutine keywords and how the compiler transforms them.

What are Coroutines?

A coroutine is a function that can suspend and later resume. Useful for asynchronous code, generators, and cooperative multitasking.

The Three Keywords

C++20 introduces three new keywords for coroutines:

  • co_await — suspend until an awaitable completes
  • co_yield — suspend and yield a value
  • co_return — finish the coroutine, optionally with a value

All lessons in this course

  1. Coroutine Concepts co_await co_yield co_return
  2. Implementing a Simple Generator
  3. Async Tasks and Awaiter Types
  4. Coroutine Frame Allocation
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