### append

Completion token type used to specify that the completion handler arguments should be passed additional values after the results of the operation.

    template<
        typename CompletionToken,
        typename... Values>
    constexpr append_t< decay_t< CompletionToken >, decay_t< Values >... > append(
        CompletionToken && completion_token,
        Values &&... values);

##### Requirements

Header: `asio/append.hpp`

Convenience header: `asio.hpp`