34 Execution control library [exec]

34.9 Senders [exec.snd]

34.9.8 execution​::​apply_sender [exec.snd.apply]

namespace std::execution { template<class Domain, class Tag, sender Sndr, class... Args> constexpr decltype(auto) apply_sender(Domain dom, Tag, Sndr&& sndr, Args&&... args) noexcept(see below); }
Let e be the expression dom.apply_sender(Tag(), std::forward<Sndr>(sndr), std::forward<Args>(args)...) if that expression is well-formed; otherwise, default_domain().apply_sender(Tag(), std::forward<Sndr>(sndr), std::forward<Args>(args)...)
Constraints: The expression e is well-formed.
Returns: e.
Remarks: The exception specification is equivalent to noexcept(e).