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Maintainers' Guide

This is a place to put design rationale and code idioms that maintainers of stdexec should follow.

  • Data, including downstream receivers, are best stored in the operation state. Receivers themselves should, in general, store nothing but a pointer back to the operation state.

  • Assume that schedulers and receivers contain nothing but a pointer and are cheap to copy. Take them by value.

  • Do not use tag_invoke anywhere. It's deprecated.

  • In a sender adaptor, a reasonable way to constrain ThisSender<InnerSender>::connect(OuterReceiver) is by requiring sender_to<InnerSender, ThisReceiver<OuterReceiver>>.

  • Place concept checks on public interfaces. Only place concept checks on implementation details if needed for correctness; otherwise, leave them unconstrained. Use static_assert if you must, but don't bother rechecking things that were already checked at the public interface.