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Request the io_service to invoke the given
          handler and return immediately.
        
template< typename CompletionHandler> void-or-deduced post( CompletionHandler handler);
          This function is used to ask the io_service to execute the given
          handler, but without allowing the io_service to call the handler
          from inside this function.
        
          The io_service
          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 to be called. The io_service 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.