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(Deprecated:
          Use dispatch.)
          Request the io_context
          to invoke the given handler.
        
template<
    typename LegacyCompletionHandler>
DEDUCED dispatch(
    LegacyCompletionHandler && handler);
          This function is used to ask the io_context
          to execute the given handler.
        
          The io_context
          guarantees that the handler will only be called in a thread in which the
          run(), run_one(), poll() or poll_one()
          member functions is currently being invoked. The handler may be executed
          inside this function if the guarantee can be met.
        
                The handler to be called. The io_context
                will make a copy of the handler object as required. The function
                signature of the handler must be:
void handler();
This function throws an exception only if:
asio_handler_allocate function; or
            throws an exception.