std::execution::stopped_as_optional

 

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Execution concepts scheduler receiver operation_state      scope_token sender sender_in dependent_sender scope_association        Execution components Execution contexts run_loop Execution domains default_domain transform_sender      apply_sender Forward progress guarantee forward_progress_guarantee Environments env      prop      get_env      env_of_t Queries std::stop_token_of_t std::get_stop_token std::get_allocator std::forwarding_query get_scheduler get_domain get_completion_domain get_forward_progress_guarantee get_start_scheduler get_delegation_scheduler get_completion_scheduler get_await_completion_adaptor Completion signatures completion_signatures completion_signatures_of_t value_types_of_t error_types_of_t      tag_of_t sends_stopped Sender adaptor closures sender_adaptor_closure Coroutine utility as_awaitable with_awaitable_senders affine inline_scheduler task task_scheduler

Core operations Operation state connect connect_result_t start Completion set_value      set_error      set_stopped Sender algorithms Sender factories just just_error just_stopped read_env schedule schedule_result_t Sender adaptors starts_on continues_on on schedule_from      then upon_error upon_stopped let_value let_error let_stopped when_all when_all_with_variant into_variant stopped_as_optional stopped_as_error bulk write_env unstoppable associate spawn_future Sender consumers this_thread::sync_wait this_thread::sync_wait_with_variant spawn Asynchronous scopes simple_counting_scope counting_scope Parallel scheduler parallel_scheduler get_parallel_scheduler receiver_proxy bulk_item_receiver_proxy parallel_scheduler_backend query_parallel_scheduler_backend

 

Defined in header <execution>
execution::sender auto stopped_as_optional( /*single-sender*/ auto snd );		(since C++26)

Parameters

snd

-

input sender of which the value channel and stopped channel are mapped.

Return value

Returns a sender that maps the value channel from a T to an std::optional<std::decay_t<T>>, and maps the stopped channel to a value of an empty std::optional<std::decay_t<T>>.