##### basic_datagram_socket::async_send_to (2 of 2 overloads)

Start an asynchronous send.

    template<
        typename ConstBufferSequence,
        typename WriteToken = default_completion_token_t<executor_type>>
    DEDUCED async_send_to(
        const ConstBufferSequence & buffers,
        const endpoint_type & destination,
        socket_base::message_flags flags,
        WriteToken && token = default_completion_token_t< executor_type >());

This function is used to asynchronously send a datagram to the specified remote endpoint. It is an initiating function for an asynchronous operation, and always returns immediately.

###### Parameters

buffers

  One or more data buffers to be sent to the remote endpoint. Although the buffers object may be copied as necessary, ownership of the underlying memory blocks is retained by the caller, which must guarantee that they remain valid until the completion handler is called.

flags

  Flags specifying how the send call is to be made.

destination

  The remote endpoint to which the data will be sent. Copies will be made of the endpoint as required.

token

  The completion token that will be used to produce a completion handler, which will be called when the send completes. Potential completion tokens include `use_future`, `use_awaitable`, `yield_context`, or a function object with the correct completion signature. The function signature of the completion handler must be:

      void handler(
        const asio::error_code& error, // Result of operation.
        std::size_t bytes_transferred // Number of bytes sent.
      );

  Regardless of whether the asynchronous operation completes immediately or not, the completion handler will not be invoked from within this function. On immediate completion, invocation of the handler will be performed in a manner equivalent to using `async_immediate`.

###### Completion Signature

    void(asio::error_code, std::size_t)

###### Per-Operation Cancellation

On POSIX or Windows operating systems, this asynchronous operation supports cancellation for the following `cancellation_type` values:

- `cancellation_type::terminal`
- `cancellation_type::partial`
- `cancellation_type::total`