template<
    typename CompletionToken,
    completion_signature... Signatures,
    typename Initiation,
    typename... Args>
DEDUCED async_initiate(
    Initiation && initiation,
    type_identity_t< CompletionToken > & token,
    Args &&... args);

Requirements

Header: boost/asio/async_result.hpp

Convenience header: boost/asio.hpp