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###### connection::async_close (1 of 2 overloads)

Closes the connection to the server.

###### Synopsis

    template<
        class CompletionToken>
    auto
    async_close(
        CompletionToken&& token);

###### Description

This function is only available if `Stream` satisfies the `SocketStream` concept.

Sends a quit request, performs the TLS shutdown (if required) and closes the underlying stream. Prefer this function to `connection::quit`.

###### Handler signature

The handler signature for this operation is `void(boost::mysql::error_code)`.

###### Executor

Intermediate completion handlers, as well as the final handler, are executed using `token`'s associated executor, or `this->get_executor()` if the token doesn't have an associated executor.

If the final handler has an associated immediate executor, and the operation completes immediately, the final handler is dispatched to it. Otherwise, the final handler is called as if it was submitted using `asio::post`, and is never be called inline from within this function.