asio::async_write and strand

Question

asio::async_write(m_socket, asio::buffer(buf, bytes),
                custom_alloc(m_strand.wrap(custom_alloc(_OnSend))));

Does this code guarantee

Answer 1

UPD: This answer is wrong=) For anyone interested you can check details in the tail of comments, thanks to Tanner Sansbury.

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No. This guarantees your completion handler will be called with strand lock. This not includes calls to async_write_some.

Also boost::asio does not have something like "write queue" and you need to manage async_write calls in order to prevent writing mixed content.