### Composition and Completion Tokens

- Stackless Coroutines
- Stackful Coroutines
- Futures
- C++20 Coroutines Support
- Resumable C++20 Coroutines (experimental)
- Deferred Operations
- Promises (experimental)
- Co-ordinating Parallel Operations (experimental)
- Compositions as Asynchronous Operations
- Completion Token Adapters
- Type Erasure, Separate Compilation and Virtual Functions
- Customising Immediate Completion