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std::execution::stopped_as_optional

From cppreference.com
Defined in header <experimental/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>>.