exec::stopped_by by RobertLeahy · Pull Request #2346 · NVIDIA/stdexec

RobertLeahy · 2026-10-18T03:29:28Z

Adds:

exec::stopped_by from P4390R0
storage_for_completion_signatures and matching_completion_signatures_t from P4288R2 (sans reflection) which are required for the above

Also adds a missing include.

copy-pr-bot · 2026-10-18T03:29:31Z

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ispeters

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Several headers in exec depend on __storage.hpp.

Allows for template arguments deduced from a completion, for example in: template<typename... Args> void set_value(Args&&...); To be used to determine which completion signature such a completion corresponds to. See P4288.

Provides a turnkey, reference-aware way to store completion signatures for later examination or transmission. See P4288. Note that this implementation diverges from the implementation described in P4288. In order to remain device compatible this implementation stores a __tuple rather than a std::tuple. Therefore storage_for_completion_signature::arguments cannot be provided (since it returns a reference to the directly stored std::tuple, which doesn't exist in this implementation). Moreover to support algorithms which aim to be usable on host and device the implementation in this commit provides both storage_for_completion_signature::forward_arguments and ::__forward_arguments where the latter returns a __tuple and can therefore be marked as being device compatible.

Implements stopped_by from P4390R0.