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

Performs the MySQL-level handshake.

###### Synopsis

    template<
        class CompletionToken>
    auto
    async_handshake(
        const handshake_params& params,
        CompletionToken&& token);

###### Description

Does not connect the underlying stream. If the `Stream` template parameter fulfills the `SocketConnection` requirements, use `connection::connect` instead of this function.

If using a SSL-capable stream, the SSL handshake will be performed by this function.

###### Object lifetimes

The strings pointed to by `params` should be kept alive by the caller until the operation completes, as no copy is made by the library.

###### 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.