#### deferred_async_operation< deferred_signatures< Signatures... >, Initiation, InitArgs... >::operator()

Initiate the asynchronous operation using the supplied completion token.

    template<
        typename CompletionToken>
    auto operator()(
        CompletionToken && token);
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    template<
        typename CompletionToken>
    auto operator()(
        CompletionToken && token) const;
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