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Completion token type used to specify that the completion handler arguments should be passed additional values before the results of the operation.
template< typename CompletionToken, typename... Values> constexpr prepend_t< decay_t< CompletionToken >, decay_t< Values >... > prepend( CompletionToken && completion_token, Values &&... values);
Header: boost/asio/prepend.hpp
Convenience header: boost/asio.hpp